lab45

lab3/.gitignore

@@ -0,0 +1,36 @@
+HELP.md
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+data.*.db

lab3/.vscode/extensions.json

@@ -0,0 +1,12 @@
+{
+  "recommendations": [
+    // fronted
+    "AndersEAndersen.html-class-suggestions",
+    "dbaeumer.vscode-eslint",
+    // backend
+    "vscjava.vscode-java-pack",
+    "vmware.vscode-boot-dev-pack",
+    "vscjava.vscode-gradle",
+    "redhat.vscode-xml"
+  ]
+}

lab3/.vscode/launch.json

@@ -0,0 +1,24 @@
+{
+    "configurations": [
+        {
+            "type": "java",
+            "name": "Demo",
+            "request": "launch",
+            "cwd": "${workspaceFolder}",
+            "mainClass": "com.example.demo.DemoApplication",
+            "projectName": "lec4",
+            "args": "",
+            "envFile": "${workspaceFolder}/.env"
+        },
+        {
+            "type": "java",
+            "name": "Demo (populate)",
+            "request": "launch",
+            "cwd": "${workspaceFolder}",
+            "mainClass": "com.example.demo.DemoApplication",
+            "projectName": "lec4",
+            "args": "--populate",
+            "envFile": "${workspaceFolder}/.env"
+        }
+    ]
+}

lab3/.vscode/settings.json

@@ -0,0 +1,21 @@
+{
+    "editor.tabSize": 4,
+    "editor.detectIndentation": false,
+    "editor.insertSpaces": true,
+    "editor.formatOnPaste": true,
+    "editor.formatOnSave": true,
+    "editor.formatOnType": false,
+    "java.compile.nullAnalysis.mode": "disabled",
+    "java.configuration.updateBuildConfiguration": "automatic",
+    "[java]": {
+        "editor.pasteAs.enabled": false,
+    },
+    "gradle.nestedProjects": true,
+    "java.saveActions.organizeImports": true,
+    "java.dependency.packagePresentation": "hierarchical",
+    "spring-boot.ls.problem.boot2.JAVA_CONSTRUCTOR_PARAMETER_INJECTION": "WARNING",
+    "spring.initializr.defaultLanguage": "Java",
+    "java.format.settings.url": ".vscode/eclipse-formatter.xml",
+    "java.project.explorer.showNonJavaResources": true,
+    "java.codeGeneration.hashCodeEquals.useJava7Objects": true,
+}

lab3/build.gradle

@@ -0,0 +1,62 @@
+plugins {
+	id 'java'
+	id 'org.springframework.boot' version '3.2.4'
+	id 'io.spring.dependency-management' version '1.1.4'
+}
+
+group = 'com.example'
+version = '0.0.1-SNAPSHOT'
+
+defaultTasks 'bootRun'
+
+ext {
+    springProfiles = []
+    if (project.hasProperty('prod')) {
+        springProfiles.add('prod')
+    } else {
+        springProfiles.add('dev')
+    }
+}
+
+bootRun {
+    def currentProfiles = springProfiles.join(',')
+    println('Current profiles are: ' + currentProfiles)
+    def currentArgs = ['--spring.profiles.active=' + currentProfiles]
+    if (project.hasProperty('args')) {
+        currentArgs.addAll(project.args.split(','))
+    }
+    args currentArgs
+}
+
+jar {
+    enabled = false
+}
+
+bootJar {
+    archiveFileName = String.format('%s-%s.jar', rootProject.name, version)
+}
+
+assert System.properties['java.specification.version'] == '17' || '21'
+java {
+	sourceCompatibility = '17'
+}
+
+repositories {
+	mavenCentral()
+}
+
+dependencies {
+    implementation 'org.springframework.boot:spring-boot-starter-web'
+	implementation 'org.springframework.boot:spring-boot-starter-validation'
+	implementation 'org.springdoc:springdoc-openapi-starter-webmvc-ui:2.3.0'
+	implementation 'org.modelmapper:modelmapper:3.2.0'
+
+	implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+	implementation 'com.h2database:h2:2.2.224'
+
+	testImplementation 'org.springframework.boot:spring-boot-starter-test'
+}
+
+tasks.named('test') {
+	useJUnitPlatform()
+}

lab3/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

lab3/gradlew

@@ -0,0 +1,249 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

lab3/gradlew.bat

@@ -0,0 +1,92 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

lab3/readme.md

@@ -0,0 +1,28 @@
+Swagger UI: \
+http://localhost:8080/swagger-ui/index.html
+
+H2 Console: \
+http://localhost:8080/h2-console
+
+JDBC URL: jdbc:h2:file:./data \
+User Name: sa \
+Password: password
+
+Для профиля prod необходимо наличие СУБД PostgreSQL и БД demo-app.
+
+Создать БД можно так: \
+createdb -h localhost -U postgres demo-app
+
+Пример запуска приложения с профилем prod и заполнением БД с помощью аргумента --populate:
+
+- nix => bash ./gradlew.bat -Pprod -Pargs='--populate'
+- windows =>.\gradlew.bat -Pprod -Pargs='--populate'
+
+Почитать:
+
+- Односторонние и двусторонние связи https://www.baeldung.com/jpa-hibernate-associations
+- Getters и Setters для двусторонних связей https://en.wikibooks.org/wiki/Java_Persistence/OneToMany#Getters_and_Setters
+- Многие-ко-многим с доп. атрибутами https://thorben-janssen.com/hibernate-tip-many-to-many-association-with-additional-attributes/
+- Многие-ко-многим с доп. атрибутами https://www.baeldung.com/jpa-many-to-many
+- Каскадное удаление сущностей со связями многие-ко-многим https://www.baeldung.com/jpa-remove-entity-many-to-many
+- Выбор типа коллекции для отношений вида ко-многим в JPA https://thorben-janssen.com/association-mappings-bag-list-set/

lab3/settings.gradle

@@ -0,0 +1 @@
+rootProject.name = 'demo'

lab3/src/main/java/com/example/demo/DemoApplication.java

@@ -0,0 +1,61 @@
+package com.example.demo;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+import com.example.demo.authors.model.AuthorEntity;
+import com.example.demo.authors.service.AuthorService;
+import com.example.demo.books.model.BookEntity;
+import com.example.demo.books.service.BookService;
+import com.example.demo.genres.model.GenreEntity;
+import com.example.demo.genres.service.GenreService;
+
+@SpringBootApplication
+public class DemoApplication implements CommandLineRunner {
+    private final Logger log = LoggerFactory.getLogger(DemoApplication.class);
+
+    private final GenreService genreService;
+    private final AuthorService authorService;
+    private final BookService bookService;
+
+    public DemoApplication(GenreService genreService, AuthorService authorService, BookService bookService) {
+        this.genreService = genreService;
+        this.authorService = authorService;
+        this.bookService = bookService;
+    }
+
+    public static void main(String[] args) {
+        SpringApplication.run(DemoApplication.class, args);
+    }
+
+    @Override
+    public void run(String... args) throws Exception {
+        if (args.length > 0 && Arrays.asList(args).contains("--populate")) {
+            log.info("Create default genre values");
+            final var genre1 = genreService.create(new GenreEntity("Роман"));
+            final var genre2 = genreService.create(new GenreEntity("Комедия"));
+            final var genre3 = genreService.create(new GenreEntity("Трагедия"));
+
+            log.info("Create default author values");
+            final var author1 = authorService.create(new AuthorEntity("Л.Н. Толстой"));
+            final var author2 = authorService.create(new AuthorEntity("Илья Ильф"));
+            final var author3 = authorService.create(new AuthorEntity("Ф.М. Достоевский"));
+
+            log.info("Create default book values");
+            final var books = List.of(
+                    new BookEntity(genre1, author1, "", "", ""),
+                    new BookEntity(genre1, author2, "", "", ""),
+                    new BookEntity(genre2, author3, "", "", ""),
+                    new BookEntity(genre2, author1, "", "", ""),
+                    new BookEntity(genre3, author2, "", "", ""),
+                    new BookEntity(genre3, author3, "", "", ""));
+            books.forEach(book -> bookService.create(book));
+        }
+    }
+}

lab3/src/main/java/com/example/demo/authors/api/AuthorController.java

@@ -0,0 +1,68 @@
+package com.example.demo.authors.api;
+
+import java.util.List;
+
+import org.modelmapper.ModelMapper;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.example.demo.core.configuration.Constants;
+import com.example.demo.authors.model.AuthorEntity;
+import com.example.demo.authors.service.AuthorService;
+
+import jakarta.validation.Valid;
+
+@RestController
+@RequestMapping(Constants.API_URL + "/author")
+public class AuthorController {
+    private final AuthorService authorService;
+    private final ModelMapper modelMapper;
+
+    public AuthorController(AuthorService authorService, ModelMapper modelMapper) {
+        this.authorService = authorService;
+        this.modelMapper = modelMapper;
+    }
+
+    private AuthorDto toDto(AuthorEntity entity) {
+        return modelMapper.map(entity, AuthorDto.class);
+    }
+
+    private AuthorEntity toEntity(AuthorDto dto) {
+        return modelMapper.map(dto, AuthorEntity.class);
+    }
+
+    @GetMapping
+    public List<AuthorDto> getAll() {
+        return authorService.getAll().stream()
+                .map(this::toDto)
+                .toList();
+    }
+
+    @GetMapping("/{id}")
+    public AuthorDto get(@PathVariable(name = "id") Long id) {
+        return toDto(authorService.get(id));
+    }
+
+    @PostMapping
+    public AuthorDto create(@RequestBody @Valid AuthorDto dto) {
+        return toDto(authorService.create(toEntity(dto)));
+    }
+
+    @PutMapping("/{id}")
+    public AuthorDto update(
+            @PathVariable(name = "id") Long id,
+            @RequestBody @Valid AuthorDto dto) {
+        return toDto(authorService.update(id, toEntity(dto)));
+    }
+
+    @DeleteMapping("/{id}")
+    public AuthorDto delete(@PathVariable(name = "id") Long id) {
+        return toDto(authorService.delete(id));
+    }
+}

lab3/src/main/java/com/example/demo/authors/api/AuthorDto.java

@@ -0,0 +1,30 @@
+package com.example.demo.authors.api;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
+
+public class AuthorDto {
+    @JsonProperty(access = JsonProperty.Access.READ_ONLY)
+    private Long id;
+    @NotBlank
+    @Size(min = 5, max = 50)
+    private String name;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}

lab3/src/main/java/com/example/demo/authors/model/AuthorEntity.java

@@ -0,0 +1,53 @@
+package com.example.demo.authors.model;
+
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+
+import com.example.demo.books.model.BookEntity;
+import com.example.demo.core.model.BaseEntity;
+
+import jakarta.persistence.CascadeType;
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.OneToMany;
+import jakarta.persistence.Table;
+
+@Entity
+@Table(name = "authors")
+public class AuthorEntity extends BaseEntity {
+    @Column(nullable = false, unique = true, length = 50)
+    private String name;
+    @OneToMany(mappedBy = "author", cascade = CascadeType.ALL)
+    private Set<BookEntity> books = new HashSet<>();
+
+    public AuthorEntity() {
+    }
+
+    public AuthorEntity(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, name);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null || getClass() != obj.getClass())
+            return false;
+        final AuthorEntity other = (AuthorEntity) obj;
+        return Objects.equals(other.getId(), id) && Objects.equals(other.getName(), name);
+    }
+}

lab3/src/main/java/com/example/demo/authors/repository/AuthorRepository.java

@@ -0,0 +1,11 @@
+package com.example.demo.authors.repository;
+
+import java.util.Optional;
+
+import org.springframework.data.repository.CrudRepository;
+
+import com.example.demo.authors.model.AuthorEntity;
+
+public interface AuthorRepository extends CrudRepository<AuthorEntity, Long> {
+    Optional<AuthorEntity> findByNameIgnoreCase(String name);
+}

lab3/src/main/java/com/example/demo/authors/service/AuthorService.java

@@ -0,0 +1,68 @@
+package com.example.demo.authors.service;
+
+import java.util.List;
+import java.util.stream.StreamSupport;
+
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import com.example.demo.core.error.NotFoundException;
+import com.example.demo.authors.model.AuthorEntity;
+import com.example.demo.authors.repository.AuthorRepository;
+
+@Service
+public class AuthorService {
+    private final AuthorRepository repository;
+
+    public AuthorService(AuthorRepository repository) {
+        this.repository = repository;
+    }
+
+    private void checkName(String name) {
+        if (repository.findByNameIgnoreCase(name).isPresent()) {
+            throw new IllegalArgumentException(
+                    String.format("Author with name %s is already exists", name));
+        }
+    }
+
+    public AuthorEntity findByName(String name) {
+        return repository.findByNameIgnoreCase(name).orElse(null);
+    }
+
+    @Transactional(readOnly = true)
+    public List<AuthorEntity> getAll() {
+        return StreamSupport.stream(repository.findAll().spliterator(), false).toList();
+    }
+
+    @Transactional(readOnly = true)
+    public AuthorEntity get(long id) {
+        return repository.findById(id)
+                .orElseThrow(() -> new NotFoundException(AuthorEntity.class, id));
+    }
+
+    @Transactional
+    public AuthorEntity create(AuthorEntity entity) {
+        if (entity == null) {
+            throw new IllegalArgumentException("Entity is null");
+        }
+        checkName(entity.getName());
+        return repository.save(entity);
+    }
+
+    @Transactional
+    public AuthorEntity update(Long id, AuthorEntity entity) {
+        final AuthorEntity existsEntity = get(id);
+        if (!existsEntity.getName().equalsIgnoreCase(entity.getName())) {
+            checkName(entity.getName());
+        }
+        existsEntity.setName(entity.getName());
+        return repository.save(existsEntity);
+    }
+
+    @Transactional
+    public AuthorEntity delete(Long id) {
+        final AuthorEntity existsEntity = get(id);
+        repository.delete(existsEntity);
+        return existsEntity;
+    }
+}

lab3/src/main/java/com/example/demo/books/api/BookController.java

@@ -0,0 +1,83 @@
+package com.example.demo.books.api;
+
+import org.modelmapper.ModelMapper;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.example.demo.genres.service.GenreService;
+import com.example.demo.core.api.PageDto;
+import com.example.demo.core.api.PageDtoMapper;
+import com.example.demo.core.configuration.Constants;
+import com.example.demo.books.model.BookEntity;
+import com.example.demo.books.service.BookService;
+
+import jakarta.validation.Valid;
+
+import org.springframework.data.domain.PageRequest;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.PutMapping;
+
+@RestController
+@RequestMapping(Constants.API_URL + "/book")
+public class BookController {
+    private final BookService bookService;
+    private final GenreService genreService;
+    private final ModelMapper modelMapper;
+
+    public BookController(BookService bookService, GenreService genreService, ModelMapper modelMapper) {
+        this.modelMapper = modelMapper;
+        this.genreService = genreService;
+        this.bookService = bookService;
+    }
+
+    private BookDto toDto(BookEntity entity) {
+        return modelMapper.map(entity, BookDto.class);
+    }
+
+    private BookEntity toEntity(BookDto dto) {
+        final BookEntity entity = modelMapper.map(dto, BookEntity.class);
+        entity.setGenre(genreService.get(dto.getGenreId()));
+        return entity;
+    }
+
+    // @GetMapping
+    // public List<BookDto> getAll(@RequestParam(name = "genreId", defaultValue =
+    // "0") Long genreId) {
+    // return bookService.getAll(genreId).stream().map(this::toDto).toList();
+    // }
+
+    @GetMapping
+    public PageDto<BookDto> getAll(
+            @RequestParam(name = "genreId", defaultValue = "0") Long genreId,
+            @RequestParam(name = "authorId", defaultValue = "0") Long authorId,
+            @RequestParam(name = "pageNumber", defaultValue = "0") Integer pageNumber,
+            @RequestParam(name = "pageSize", defaultValue = "5") Integer pageSize) {
+        PageRequest pageRequest = PageRequest.of(pageNumber, pageSize);
+        return PageDtoMapper.toDto(bookService.getAll(genreId, authorId, pageRequest), this::toDto);
+    }
+
+    @GetMapping("/{id}")
+    public BookDto get(@PathVariable(name = "id") Long id) {
+        return toDto(bookService.get(id));
+    }
+
+    @PostMapping
+    public BookDto create(@RequestBody @Valid BookDto dto) {
+        return toDto(bookService.create(toEntity(dto)));
+    }
+
+    @PutMapping("/{id}")
+    public BookDto update(@PathVariable(name = "id") Long id, @RequestBody BookDto dto) {
+        return toDto(bookService.update(id, toEntity(dto)));
+    }
+
+    @DeleteMapping("/{id}")
+    public BookDto delete(@PathVariable(name = "id") Long id) {
+        return toDto(bookService.delete(id));
+    }
+}

lab3/src/main/java/com/example/demo/books/api/BookDto.java

@@ -0,0 +1,77 @@
+package com.example.demo.books.api;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import jakarta.validation.constraints.Min;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
+
+public class BookDto {
+    private Integer id;
+
+    @NotNull
+    @Min(1)
+    private Integer genreId;
+
+    @NotNull
+    @Min(1)
+    private Integer authorId;
+
+    @NotBlank
+    private String name;
+
+    @NotBlank
+    private String year;
+
+    @NotBlank
+    private String description;
+
+    @JsonProperty(access = JsonProperty.Access.READ_ONLY)
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public Integer getGenreId() {
+        return genreId;
+    }
+
+    public void setGenreId(Integer genreId) {
+        this.genreId = genreId;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Integer getAuthorId() {
+        return authorId;
+    }
+
+    public void setAuthorId(Integer authorId) {
+        this.authorId = authorId;
+    }
+
+    public String getYear() {
+        return year;
+    }
+
+    public void setYear(String year) {
+        this.year = year;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+}

lab3/src/main/java/com/example/demo/books/model/BookEntity.java

@@ -0,0 +1,101 @@
+package com.example.demo.books.model;
+
+import java.util.Objects;
+
+import com.example.demo.authors.model.AuthorEntity;
+import com.example.demo.core.model.BaseEntity;
+import com.example.demo.genres.model.GenreEntity;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.Table;
+
+@Entity
+@Table(name = "books")
+public class BookEntity extends BaseEntity {
+    @ManyToOne
+    @JoinColumn(name = "genreId", nullable = false)
+    private GenreEntity genre;
+    @ManyToOne
+    @JoinColumn(name = "authorId", nullable = false)
+    private AuthorEntity author;
+    @Column(nullable = false, length = 50)
+    private String name;
+    @Column(name = "years", nullable = false, length = 4)
+    private String year;
+    @Column(nullable = false, length = 250)
+    private String description;
+
+    public BookEntity() {
+    }
+
+    public BookEntity(GenreEntity genre, AuthorEntity author, String name, String year, String description) {
+        this.genre = genre;
+        this.name = name;
+        this.author = author;
+        this.year = year;
+        this.description = description;
+    }
+
+    public GenreEntity getGenre() {
+        return genre;
+    }
+
+    public void setGenre(GenreEntity genre) {
+        this.genre = genre;
+    }
+
+    public AuthorEntity getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(AuthorEntity author) {
+        this.author = author;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getYear() {
+        return year;
+    }
+
+    public void setYear(String year) {
+        this.year = year;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, genre, name, author, year, description);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null || getClass() != obj.getClass())
+            return false;
+        final BookEntity other = (BookEntity) obj;
+        return Objects.equals(other.getId(), id)
+                && Objects.equals(other.getGenre(), genre)
+                && Objects.equals(other.getName(), name)
+                && Objects.equals(other.getAuthor(), author)
+                && Objects.equals(other.getYear(), year)
+                && Objects.equals(other.getDescription(), description);
+    }
+}

lab3/src/main/java/com/example/demo/books/repository/BookRepository.java

@@ -0,0 +1,28 @@
+package com.example.demo.books.repository;
+
+import java.util.Optional;
+import java.util.List;
+
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.repository.CrudRepository;
+import org.springframework.data.repository.PagingAndSortingRepository;
+
+import com.example.demo.books.model.BookEntity;
+
+public interface BookRepository
+        extends CrudRepository<BookEntity, Long>, PagingAndSortingRepository<BookEntity, Long> {
+    Optional<BookEntity> findByNameIgnoreCase(String name);
+
+    List<BookEntity> findByGenreId(Long genreId);
+
+    Page<BookEntity> findByGenreId(Long genreId, PageRequest pageable);
+
+    List<BookEntity> findByAuthorId(Long authorId);
+
+    Page<BookEntity> findByAuthorId(Long authorId, PageRequest pageable);
+
+    List<BookEntity> findByGenreIdAndAuthorId(Long genreId, Long authorId);
+
+    Page<BookEntity> findByGenreIdAndAuthorId(Long genreId, Long authorId, PageRequest pageable);
+}

lab3/src/main/java/com/example/demo/books/service/BookService.java

@@ -0,0 +1,76 @@
+package com.example.demo.books.service;
+
+import java.util.List;
+import java.util.stream.StreamSupport;
+
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import com.example.demo.core.error.NotFoundException;
+import com.example.demo.books.model.BookEntity;
+import com.example.demo.books.repository.BookRepository;
+
+@Service
+public class BookService {
+    private final BookRepository repository;
+
+    public BookService(BookRepository repository) {
+        this.repository = repository;
+    }
+
+    @Transactional(readOnly = true)
+    public List<BookEntity> getAll(long genreId, long authorId) {
+        if (genreId == 0L && authorId == 0L) {
+            return StreamSupport.stream(repository.findAll().spliterator(), false).toList();
+        } else if (genreId == 0L) {
+            return repository.findByAuthorId(authorId);
+        } else if (authorId == 0L) {
+            return repository.findByGenreId(genreId);
+        } else {
+            return repository.findByGenreIdAndAuthorId(genreId, authorId);
+        }
+    }
+
+    @Transactional(readOnly = true)
+    public Page<BookEntity> getAll(long genreId, long authorId, PageRequest pageRequest) {
+        if (genreId == 0L && authorId == 0L) {
+            return repository.findAll(pageRequest);
+        } else if (genreId == 0L) {
+            return repository.findByAuthorId(authorId, pageRequest);
+        } else if (authorId == 0L) {
+            return repository.findByGenreId(genreId, pageRequest);
+        } else {
+            return repository.findByGenreIdAndAuthorId(genreId, authorId, pageRequest);
+        }
+    }
+
+    @Transactional(readOnly = true)
+    public BookEntity get(long id) {
+        return repository.findById(id)
+                .orElseThrow(() -> new NotFoundException(BookEntity.class, id));
+    }
+
+    @Transactional
+    public BookEntity create(BookEntity entity) {
+        if (entity == null) {
+            throw new IllegalArgumentException("Entity is null");
+        }
+        return repository.save(entity);
+    }
+
+    @Transactional
+    public BookEntity update(Long id, BookEntity entity) {
+        final BookEntity existsEntity = get(id);
+        existsEntity.setName(entity.getName());
+        return repository.save(existsEntity);
+    }
+
+    @Transactional
+    public BookEntity delete(Long id) {
+        final BookEntity existsEntity = get(id);
+        repository.delete(existsEntity);
+        return existsEntity;
+    }
+}

lab3/src/main/java/com/example/demo/core/api/PageDto.java

@@ -0,0 +1,97 @@
+package com.example.demo.core.api;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class PageDto<D> {
+    private List<D> items = new ArrayList<>();
+    private int itemsCount;
+    private int currentPage;
+    private int currentSize;
+    private int totalPages;
+    private long totalItems;
+    private boolean isFirst;
+    private boolean isLast;
+    private boolean hasNext;
+    private boolean hasPrevious;
+
+    public List<D> getItems() {
+        return items;
+    }
+
+    public void setItems(List<D> items) {
+        this.items = items;
+    }
+
+    public int getItemsCount() {
+        return itemsCount;
+    }
+
+    public void setItemsCount(int itemsCount) {
+        this.itemsCount = itemsCount;
+    }
+
+    public int getCurrentPage() {
+        return currentPage;
+    }
+
+    public void setCurrentPage(int currentPage) {
+        this.currentPage = currentPage;
+    }
+
+    public int getCurrentSize() {
+        return currentSize;
+    }
+
+    public void setCurrentSize(int currentSize) {
+        this.currentSize = currentSize;
+    }
+
+    public int getTotalPages() {
+        return totalPages;
+    }
+
+    public void setTotalPages(int totalPages) {
+        this.totalPages = totalPages;
+    }
+
+    public long getTotalItems() {
+        return totalItems;
+    }
+
+    public void setTotalItems(long totalItems) {
+        this.totalItems = totalItems;
+    }
+
+    public boolean isFirst() {
+        return isFirst;
+    }
+
+    public void setFirst(boolean isFirst) {
+        this.isFirst = isFirst;
+    }
+
+    public boolean isLast() {
+        return isLast;
+    }
+
+    public void setLast(boolean isLast) {
+        this.isLast = isLast;
+    }
+
+    public boolean isHasNext() {
+        return hasNext;
+    }
+
+    public void setHasNext(boolean hasNext) {
+        this.hasNext = hasNext;
+    }
+
+    public boolean isHasPrevious() {
+        return hasPrevious;
+    }
+
+    public void setHasPrevious(boolean hasPrevious) {
+        this.hasPrevious = hasPrevious;
+    }
+}

lab3/src/main/java/com/example/demo/core/api/PageDtoMapper.java

@@ -0,0 +1,25 @@
+package com.example.demo.core.api;
+
+import java.util.function.Function;
+
+import org.springframework.data.domain.Page;
+
+public class PageDtoMapper {
+    private PageDtoMapper() {
+    }
+
+    public static <D, E> PageDto<D> toDto(Page<E> page, Function<E, D> mapper) {
+        final PageDto<D> dto = new PageDto<>();
+        dto.setItems(page.getContent().stream().map(mapper::apply).toList());
+        dto.setItemsCount(page.getNumberOfElements());
+        dto.setCurrentPage(page.getNumber());
+        dto.setCurrentSize(page.getSize());
+        dto.setTotalPages(page.getTotalPages());
+        dto.setTotalItems(page.getTotalElements());
+        dto.setFirst(page.isFirst());
+        dto.setLast(page.isLast());
+        dto.setHasNext(page.hasNext());
+        dto.setHasPrevious(page.hasPrevious());
+        return dto;
+    }
+}

lab3/src/main/java/com/example/demo/core/configuration/Constants.java

@@ -0,0 +1,12 @@
+package com.example.demo.core.configuration;
+
+public class Constants {
+    public static final String SEQUENCE_NAME = "hibernate_sequence";
+
+    public static final String API_URL = "/api/1.0";
+
+    public static final String DEFAULT_PAGE_SIZE = "5";
+
+    private Constants() {
+    }
+}

lab3/src/main/java/com/example/demo/core/configuration/MapperConfiguration.java

@@ -0,0 +1,13 @@
+package com.example.demo.core.configuration;
+
+import org.modelmapper.ModelMapper;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class MapperConfiguration {
+    @Bean
+    ModelMapper modelMapper() {
+        return new ModelMapper();
+    }
+}

lab3/src/main/java/com/example/demo/core/configuration/WebConfiguration.java

@@ -0,0 +1,15 @@
+package com.example.demo.core.configuration;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.lang.NonNull;
+import org.springframework.web.servlet.config.annotation.CorsRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+@Configuration
+public class WebConfiguration implements WebMvcConfigurer {
+    @Override
+    public void addCorsMappings(@NonNull CorsRegistry registry) {
+        registry.addMapping("/**")
+                .allowedMethods("GET", "POST", "PUT", "DELETE");
+    }
+}

lab3/src/main/java/com/example/demo/core/error/AdviceController.java

@@ -0,0 +1,54 @@
+package com.example.demo.core.error;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.HttpStatusCode;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+@RestControllerAdvice
+public class AdviceController {
+    private final Logger log = LoggerFactory.getLogger(AdviceController.class);
+
+    public static ErrorCauseDto getRootCause(Throwable throwable) {
+        Throwable rootCause = throwable;
+        while (rootCause.getCause() != null && rootCause.getCause() != rootCause) {
+            rootCause = rootCause.getCause();
+        }
+        final StackTraceElement firstError = rootCause.getStackTrace()[0];
+        return new ErrorCauseDto(
+                rootCause.getClass().getName(),
+                firstError.getMethodName(),
+                firstError.getFileName(),
+                firstError.getLineNumber());
+    }
+
+    private ResponseEntity<ErrorDto> handleException(Throwable throwable, HttpStatusCode httpCode) {
+        log.error("{}", throwable.getMessage());
+        throwable.printStackTrace();
+        final ErrorDto errorDto = new ErrorDto(throwable.getMessage(), AdviceController.getRootCause(throwable));
+        return new ResponseEntity<>(errorDto, httpCode);
+    }
+
+    @ExceptionHandler(NotFoundException.class)
+    @ResponseStatus(HttpStatus.NOT_FOUND)
+    public ResponseEntity<ErrorDto> handleNotFoundException(Throwable throwable) {
+        return handleException(throwable, HttpStatus.NOT_FOUND);
+    }
+
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    @ResponseStatus(HttpStatus.BAD_REQUEST)
+    public ResponseEntity<ErrorDto> handleDataIntegrityViolationException(Throwable throwable) {
+        return handleException(throwable, HttpStatus.BAD_REQUEST);
+    }
+
+    @ExceptionHandler(Exception.class)
+    @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
+    public ResponseEntity<ErrorDto> handleAnyException(Throwable throwable) {
+        return handleException(throwable, HttpStatus.INTERNAL_SERVER_ERROR);
+    }
+}

lab3/src/main/java/com/example/demo/core/error/ErrorCauseDto.java

@@ -0,0 +1,31 @@
+package com.example.demo.core.error;
+
+class ErrorCauseDto {
+    private String exception;
+    private String methodName;
+    private String fineName;
+    private int lineNumber;
+
+    ErrorCauseDto(String exception, String methodName, String fineName, int lineNumber) {
+        this.exception = exception;
+        this.methodName = methodName;
+        this.fineName = fineName;
+        this.lineNumber = lineNumber;
+    }
+
+    public String getException() {
+        return exception;
+    }
+
+    public String getMethodName() {
+        return methodName;
+    }
+
+    public String getFineName() {
+        return fineName;
+    }
+
+    public int getLineNumber() {
+        return lineNumber;
+    }
+}

lab3/src/main/java/com/example/demo/core/error/ErrorDto.java

@@ -0,0 +1,20 @@
+package com.example.demo.core.error;
+
+public class ErrorDto {
+    private String error;
+    private ErrorCauseDto rootCause;
+
+    public ErrorDto(String error, ErrorCauseDto rootCause) {
+        this.error = error;
+        this.rootCause = rootCause;
+    }
+
+    public String getError() {
+        return error;
+    }
+
+    public ErrorCauseDto getRootCause() {
+        return rootCause;
+    }
+
+}

lab3/src/main/java/com/example/demo/core/error/NotFoundException.java

@@ -0,0 +1,7 @@
+package com.example.demo.core.error;
+
+public class NotFoundException extends RuntimeException {
+    public <T> NotFoundException(Class<T> clazz, Long id) {
+        super(String.format("%s with id [%s] is not found or not exists", clazz.getSimpleName(), id));
+    }
+}

lab3/src/main/java/com/example/demo/core/model/BaseEntity.java

@@ -0,0 +1,28 @@
+package com.example.demo.core.model;
+
+import com.example.demo.core.configuration.Constants;
+
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.MappedSuperclass;
+import jakarta.persistence.SequenceGenerator;
+
+@MappedSuperclass
+public abstract class BaseEntity {
+    @Id
+    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = Constants.SEQUENCE_NAME)
+    @SequenceGenerator(name = Constants.SEQUENCE_NAME, sequenceName = Constants.SEQUENCE_NAME, allocationSize = 1)
+    protected Long id;
+
+    protected BaseEntity() {
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+}

lab3/src/main/java/com/example/demo/favorites/api/FavoriteController.java

@@ -0,0 +1,77 @@
+package com.example.demo.favorites.api;
+
+import java.util.List;
+
+import org.modelmapper.ModelMapper;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.example.demo.core.configuration.Constants;
+import com.example.demo.favorites.model.FavoriteEntity;
+import com.example.demo.favorites.service.FavoriteService;
+import com.example.demo.books.service.BookService;
+import com.example.demo.users.service.UserService;
+
+import jakarta.validation.Valid;
+
+@RestController
+@RequestMapping(Constants.API_URL + "/favorite")
+public class FavoriteController {
+
+    private final FavoriteService favoriteService;
+    private final UserService userService;
+    private final BookService bookService;
+    private final ModelMapper modelMapper;
+
+    public FavoriteController(FavoriteService favoriteService, UserService userService,
+            BookService bookService, ModelMapper modelMapper) {
+        this.modelMapper = modelMapper;
+        this.userService = userService;
+        this.favoriteService = favoriteService;
+        this.bookService = bookService;
+    }
+
+    private FavoriteDto toDto(FavoriteEntity entity) {
+        return modelMapper.map(entity, FavoriteDto.class);
+    }
+
+    private FavoriteEntity toEntity(FavoriteDto dto) {
+        final FavoriteEntity entity = modelMapper.map(dto, FavoriteEntity.class);
+        entity.setBook(bookService.get(dto.getBookId()));
+        entity.setUser(userService.get(dto.getUserId()));
+        return entity;
+    }
+
+    @GetMapping
+    public List<FavoriteDto> getAll(@RequestParam(name = "userId", defaultValue = "0") Long userId) {
+        return favoriteService.getAll(userId).stream().map(this::toDto).toList();
+    }
+
+    @GetMapping("/{id}")
+    public FavoriteDto get(@PathVariable(name = "id") Long id) {
+        return toDto(favoriteService.get(id));
+    }
+
+    @PostMapping
+    public FavoriteDto create(@RequestBody @Valid FavoriteDto dto) {
+        return toDto(favoriteService.create(toEntity(dto)));
+    }
+
+    @PutMapping("/{id}")
+    public FavoriteDto update(@PathVariable(name = "id") Long id,
+            @RequestBody FavoriteDto dto) {
+        return toDto(favoriteService.update(id, toEntity(dto)));
+    }
+
+    @DeleteMapping("/{id}")
+    public FavoriteDto delete(@PathVariable(name = "id") Long id) {
+        return toDto(favoriteService.delete(id));
+    }
+}

lab3/src/main/java/com/example/demo/favorites/api/FavoriteDto.java

@@ -0,0 +1,45 @@
+package com.example.demo.favorites.api;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import jakarta.validation.constraints.Min;
+import jakarta.validation.constraints.NotNull;
+
+public class FavoriteDto {
+
+    @JsonProperty(access = JsonProperty.Access.READ_ONLY)
+    private Long id;
+
+    @NotNull
+    @Min(1)
+    private Long userId;
+
+    @NotNull
+    @Min(1)
+    private Long bookId;
+
+    @JsonProperty(access = JsonProperty.Access.READ_ONLY)
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Long getUserId() {
+        return userId;
+    }
+
+    public void setUserId(Long userId) {
+        this.userId = userId;
+    }
+
+    public Long getBookId() {
+        return bookId;
+    }
+
+    public void setBookId(Long bookId) {
+        this.bookId = bookId;
+    }
+}

lab3/src/main/java/com/example/demo/favorites/model/FavoriteEntity.java

@@ -0,0 +1,66 @@
+package com.example.demo.favorites.model;
+
+import java.util.Objects;
+
+import com.example.demo.books.model.BookEntity;
+import com.example.demo.core.model.BaseEntity;
+import com.example.demo.users.model.UserEntity;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.Table;
+
+@Entity
+@Table(name = "favorites")
+public class FavoriteEntity extends BaseEntity {
+    @ManyToOne
+    @JoinColumn(name = "userId", nullable = false)
+    private UserEntity user;
+
+    @ManyToOne
+    @JoinColumn(name = "bookId", nullable = false)
+    private BookEntity book;
+
+    public FavoriteEntity() {
+        super();
+    }
+
+    public FavoriteEntity(Integer id, UserEntity user, BookEntity book) {
+        this.user = user;
+        this.book = book;
+    }
+
+    public UserEntity getUser() {
+        return user;
+    }
+
+    public void setUser(UserEntity user) {
+        this.user = user;
+    }
+
+    public BookEntity getBook() {
+        return book;
+    }
+
+    public void setBook(BookEntity book) {
+        this.book = book;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, user, book);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null || getClass() != obj.getClass())
+            return false;
+        final FavoriteEntity other = (FavoriteEntity) obj;
+        return Objects.equals(other.getId(), id)
+                && Objects.equals(other.getUser(), user)
+                && Objects.equals(other.getBook(), book);
+    }
+}

lab3/src/main/java/com/example/demo/favorites/repository/FavoriteRepository.java

@@ -0,0 +1,13 @@
+package com.example.demo.favorites.repository;
+
+import java.util.Optional;
+import java.util.List;
+import org.springframework.data.repository.CrudRepository;
+
+import com.example.demo.favorites.model.FavoriteEntity;
+
+public interface FavoriteRepository extends CrudRepository<FavoriteEntity, Long> {
+    List<FavoriteEntity> findByUserId(Long userId);
+
+    Optional<FavoriteEntity> findOneByUserIdAndId(Long userId, Long id);
+}

lab3/src/main/java/com/example/demo/favorites/service/FavoriteService.java

@@ -0,0 +1,53 @@
+package com.example.demo.favorites.service;
+
+import java.util.List;
+import java.util.stream.StreamSupport;
+
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import com.example.demo.core.error.NotFoundException;
+import com.example.demo.favorites.model.FavoriteEntity;
+import com.example.demo.favorites.repository.FavoriteRepository;
+
+@Service
+public class FavoriteService {
+    private final FavoriteRepository repository;
+
+    public FavoriteService(FavoriteRepository repository) {
+        this.repository = repository;
+    }
+
+    @Transactional(readOnly = true)
+    public List<FavoriteEntity> getAll(Long userId) {
+        if (userId == 0) {
+            return StreamSupport.stream(repository.findAll().spliterator(), false).toList();
+        }
+        return repository.findByUserId(userId);
+    }
+
+    @Transactional(readOnly = true)
+    public FavoriteEntity get(Long id) {
+        return repository.findById(id).orElseThrow(() -> new NotFoundException(null, id));
+    }
+
+    @Transactional
+    public FavoriteEntity create(FavoriteEntity entity) {
+        return repository.save(entity);
+    }
+
+    @Transactional
+    public FavoriteEntity update(Long id, FavoriteEntity entity) {
+        final FavoriteEntity exisEntity = get(id);
+        exisEntity.setUser(entity.getUser());
+        exisEntity.setBook(entity.getBook());
+        return repository.save(exisEntity);
+    }
+
+    @Transactional
+    public FavoriteEntity delete(Long id) {
+        final FavoriteEntity existEntity = get(id);
+        repository.delete(existEntity);
+        return existEntity;
+    }
+}

lab3/src/main/java/com/example/demo/genres/api/GenreController.java

@@ -0,0 +1,68 @@
+package com.example.demo.genres.api;
+
+import java.util.List;
+
+import org.modelmapper.ModelMapper;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.example.demo.core.configuration.Constants;
+import com.example.demo.genres.model.GenreEntity;
+import com.example.demo.genres.service.GenreService;
+
+import jakarta.validation.Valid;
+
+@RestController
+@RequestMapping(Constants.API_URL + "/genre")
+public class GenreController {
+    private final GenreService genreService;
+    private final ModelMapper modelMapper;
+
+    public GenreController(GenreService genreService, ModelMapper modelMapper) {
+        this.genreService = genreService;
+        this.modelMapper = modelMapper;
+    }
+
+    private GenreDto toDto(GenreEntity entity) {
+        return modelMapper.map(entity, GenreDto.class);
+    }
+
+    private GenreEntity toEntity(GenreDto dto) {
+        return modelMapper.map(dto, GenreEntity.class);
+    }
+
+    @GetMapping
+    public List<GenreDto> getAll() {
+        return genreService.getAll().stream()
+                .map(this::toDto)
+                .toList();
+    }
+
+    @GetMapping("/{id}")
+    public GenreDto get(@PathVariable(name = "id") Long id) {
+        return toDto(genreService.get(id));
+    }
+
+    @PostMapping
+    public GenreDto create(@RequestBody @Valid GenreDto dto) {
+        return toDto(genreService.create(toEntity(dto)));
+    }
+
+    @PutMapping("/{id}")
+    public GenreDto update(
+            @PathVariable(name = "id") Long id,
+            @RequestBody @Valid GenreDto dto) {
+        return toDto(genreService.update(id, toEntity(dto)));
+    }
+
+    @DeleteMapping("/{id}")
+    public GenreDto delete(@PathVariable(name = "id") Long id) {
+        return toDto(genreService.delete(id));
+    }
+}

lab3/src/main/java/com/example/demo/genres/api/GenreDto.java

@@ -0,0 +1,30 @@
+package com.example.demo.genres.api;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
+
+public class GenreDto {
+    @JsonProperty(access = JsonProperty.Access.READ_ONLY)
+    private Long id;
+    @NotBlank
+    @Size(min = 5, max = 50)
+    private String name;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}

lab3/src/main/java/com/example/demo/genres/model/GenreEntity.java

@@ -0,0 +1,53 @@
+package com.example.demo.genres.model;
+
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+
+import com.example.demo.books.model.BookEntity;
+import com.example.demo.core.model.BaseEntity;
+
+import jakarta.persistence.CascadeType;
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.OneToMany;
+import jakarta.persistence.Table;
+
+@Entity
+@Table(name = "genres")
+public class GenreEntity extends BaseEntity {
+    @Column(nullable = false, unique = true, length = 50)
+    private String name;
+    @OneToMany(mappedBy = "genre", cascade = CascadeType.ALL)
+    private Set<BookEntity> books = new HashSet<>();
+
+    public GenreEntity() {
+    }
+
+    public GenreEntity(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, name);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null || getClass() != obj.getClass())
+            return false;
+        final GenreEntity other = (GenreEntity) obj;
+        return Objects.equals(other.getId(), id) && Objects.equals(other.getName(), name);
+    }
+}

lab3/src/main/java/com/example/demo/genres/repository/GenreRepository.java

@@ -0,0 +1,11 @@
+package com.example.demo.genres.repository;
+
+import java.util.Optional;
+
+import org.springframework.data.repository.CrudRepository;
+
+import com.example.demo.genres.model.GenreEntity;
+
+public interface GenreRepository extends CrudRepository<GenreEntity, Long> {
+    Optional<GenreEntity> findByNameIgnoreCase(String name);
+}

lab3/src/main/java/com/example/demo/genres/service/GenreService.java

@@ -0,0 +1,62 @@
+package com.example.demo.genres.service;
+
+import java.util.List;
+import java.util.stream.StreamSupport;
+
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import com.example.demo.core.error.NotFoundException;
+import com.example.demo.genres.model.GenreEntity;
+import com.example.demo.genres.repository.GenreRepository;
+
+@Service
+public class GenreService {
+    private final GenreRepository repository;
+
+    public GenreService(GenreRepository repository) {
+        this.repository = repository;
+    }
+
+    private void checkName(String name) {
+        if (repository.findByNameIgnoreCase(name).isPresent()) {
+            throw new IllegalArgumentException(
+                    String.format("Genre with name %s is already exists", name));
+        }
+    }
+
+    @Transactional(readOnly = true)
+    public List<GenreEntity> getAll() {
+        return StreamSupport.stream(repository.findAll().spliterator(), false).toList();
+    }
+
+    @Transactional(readOnly = true)
+    public GenreEntity get(long id) {
+        return repository.findById(id)
+                .orElseThrow(() -> new NotFoundException(GenreEntity.class, id));
+    }
+
+    @Transactional
+    public GenreEntity create(GenreEntity entity) {
+        if (entity == null) {
+            throw new IllegalArgumentException("Entity is null");
+        }
+        checkName(entity.getName());
+        return repository.save(entity);
+    }
+
+    @Transactional
+    public GenreEntity update(Long id, GenreEntity entity) {
+        final GenreEntity existsEntity = get(id);
+        checkName(entity.getName());
+        existsEntity.setName(entity.getName());
+        return repository.save(existsEntity);
+    }
+
+    @Transactional
+    public GenreEntity delete(Long id) {
+        final GenreEntity existsEntity = get(id);
+        repository.delete(existsEntity);
+        return existsEntity;
+    }
+}

lab3/src/main/java/com/example/demo/users/api/UserController.java

@@ -0,0 +1,74 @@
+package com.example.demo.users.api;
+
+import org.modelmapper.ModelMapper;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.example.demo.core.api.PageDto;
+import com.example.demo.core.api.PageDtoMapper;
+import com.example.demo.core.configuration.Constants;
+import com.example.demo.users.model.UserEntity;
+import com.example.demo.users.service.UserService;
+
+import jakarta.validation.Valid;
+
+@RestController
+@RequestMapping(Constants.API_URL + "/user")
+public class UserController {
+    private final UserService userService;
+    private final ModelMapper modelMapper;
+
+    public UserController(UserService userService, ModelMapper modelMapper) {
+        this.modelMapper = modelMapper;
+        this.userService = userService;
+    }
+
+    private UserEntity toEntity(UserDto dto) {
+        return modelMapper.map(dto, UserEntity.class);
+    }
+
+    private UserDto toDto(UserEntity entity) {
+        return modelMapper.map(entity, UserDto.class);
+    }
+
+    // @GetMapping()
+    // public List<UserDto> getAll() {
+    // return userService.getAll().stream().map(this::toDto).toList();
+    // }
+
+    @GetMapping
+    public PageDto<UserDto> getAll(@RequestParam(name = "pageNumber", defaultValue = "0") Integer pageNumber,
+            @RequestParam(name = "pageSize", defaultValue = "5") Integer pageSize) {
+        PageRequest pageRequest = PageRequest.of(pageNumber, pageSize);
+        return PageDtoMapper.toDto(userService.getAll(pageRequest), this::toDto);
+    }
+
+    @GetMapping("/{id}")
+    public UserDto get(@PathVariable(name = "id") Long id) {
+        return toDto(userService.get(id));
+    }
+
+    @PostMapping
+    public UserDto create(@RequestBody @Valid UserDto userDTO) {
+
+        return toDto(userService.create(toEntity(userDTO)));
+    }
+
+    @PutMapping("/{id}")
+    public UserDto update(@PathVariable(name = "id") Long id, @RequestBody UserDto userDTO) {
+        return toDto(userService.update(id, toEntity(userDTO)));
+    }
+
+    @DeleteMapping("/{id}")
+    public UserDto delete(@PathVariable(name = "id") Long id) {
+        return toDto(userService.delete(id));
+    }
+}

lab3/src/main/java/com/example/demo/users/api/UserDto.java

@@ -0,0 +1,56 @@
+package com.example.demo.users.api;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Size;
+
+public class UserDto {
+    @JsonProperty(access = JsonProperty.Access.READ_ONLY)
+    private Long id;
+
+    @NotBlank
+    @Size(min = 2, max = 50)
+    private String username;
+
+    @NotBlank
+    @Size(min = 2, max = 10)
+    private String password;
+
+    @NotNull
+    private boolean isAdmin;
+
+    @JsonProperty(access = JsonProperty.Access.READ_ONLY)
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    public boolean getIsAdmin() {
+        return isAdmin;
+    }
+
+    public void setIsAdmin(boolean isAdmin) {
+        this.isAdmin = isAdmin;
+    }
+}

lab3/src/main/java/com/example/demo/users/model/UserEntity.java

@@ -0,0 +1,74 @@
+package com.example.demo.users.model;
+
+import java.util.Objects;
+
+import com.example.demo.core.model.BaseEntity;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.Table;
+
+@Entity
+@Table(name = "users")
+public class UserEntity extends BaseEntity {
+    @Column(nullable = false, unique = true, length = 15)
+    private String username;
+
+    @Column(nullable = false, length = 10)
+    private String password;
+
+    @Column(nullable = false)
+    private boolean isAdmin;
+
+    public UserEntity() {
+
+    }
+
+    public UserEntity(String username, String password, boolean isAdmin) {
+        this.username = username;
+        this.password = password;
+        this.isAdmin = isAdmin;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    public boolean getIsAdmin() {
+        return isAdmin;
+    }
+
+    public void setIsAdmin(boolean isAdmin) {
+        this.isAdmin = isAdmin;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, username, password, isAdmin);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null || getClass() != obj.getClass())
+            return false;
+        final UserEntity other = (UserEntity) obj;
+        return Objects.equals(other.getId(), id) &&
+                Objects.equals(other.getUsername(), username) &&
+                Objects.equals(other.getIsAdmin(), isAdmin) &&
+                Objects.equals(other.getPassword(), password);
+    }
+}

lab3/src/main/java/com/example/demo/users/repository/UserRepository.java

@@ -0,0 +1,13 @@
+package com.example.demo.users.repository;
+
+import java.util.Optional;
+
+import org.springframework.data.repository.CrudRepository;
+import org.springframework.data.repository.PagingAndSortingRepository;
+
+import com.example.demo.users.model.UserEntity;
+
+public interface UserRepository
+        extends CrudRepository<UserEntity, Long>, PagingAndSortingRepository<UserEntity, Long> {
+    Optional<UserEntity> findByUsernameIgnoreCase(String username);
+}

lab3/src/main/java/com/example/demo/users/service/UserService.java

@@ -0,0 +1,59 @@
+package com.example.demo.users.service;
+
+import java.util.List;
+import java.util.stream.StreamSupport;
+
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import com.example.demo.core.error.NotFoundException;
+import com.example.demo.users.model.UserEntity;
+import com.example.demo.users.repository.UserRepository;
+
+@Service
+public class UserService {
+    private final UserRepository repository;
+
+    public UserService(UserRepository repository) {
+        this.repository = repository;
+    }
+
+    @Transactional(readOnly = true)
+    public List<UserEntity> getAll() {
+        return StreamSupport.stream(repository.findAll().spliterator(), false).toList();
+    }
+
+    @Transactional(readOnly = true)
+    public Page<UserEntity> getAll(PageRequest pageRequest) {
+        return repository.findAll(pageRequest);
+    }
+
+    @Transactional(readOnly = true)
+    public UserEntity get(Long id) {
+        return repository.findById(id).orElseThrow(() -> new NotFoundException(null, id));
+    }
+
+    @Transactional
+    public UserEntity create(UserEntity entity) {
+        return repository.save(entity);
+    }
+
+    @Transactional
+    public UserEntity update(Long id, UserEntity entity) {
+        final UserEntity existsentity = get(id);
+        existsentity.setUsername(entity.getUsername());
+        existsentity.setPassword(entity.getPassword());
+        existsentity.setIsAdmin(entity.getIsAdmin());
+        return repository.save(existsentity);
+    }
+
+    @Transactional
+    public UserEntity delete(Long id) {
+        final UserEntity existsentity = get(id);
+        repository.delete(existsentity);
+        return existsentity;
+    }
+
+}

lab3/src/main/resources/application.properties

@@ -0,0 +1,20 @@
+# Server
+spring.main.banner-mode=off
+server.port=8080
+
+# Logger settings
+# Available levels are: TRACE, DEBUG, INFO, WARN, ERROR, FATAL, OFF
+logging.level.com.example.demo=DEBUG
+
+# JPA Settings
+spring.datasource.url=jdbc:h2:file:./data
+spring.datasource.username=sa
+spring.datasource.password=password
+spring.datasource.driver-class-name=org.h2.Driver
+spring.jpa.hibernate.ddl-auto=create
+spring.jpa.open-in-view=false
+# spring.jpa.show-sql=true
+# spring.jpa.properties.hibernate.format_sql=true
+
+# H2 console
+spring.h2.console.enabled=true

lab3/src/test/java/com/example/demo/AuthorServiceTests.java

@@ -0,0 +1,77 @@
+package com.example.demo;
+
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.dao.DataIntegrityViolationException;
+
+import com.example.demo.core.error.NotFoundException;
+import com.example.demo.authors.model.AuthorEntity;
+import com.example.demo.authors.service.AuthorService;
+
+@SpringBootTest
+public class AuthorServiceTests {
+    @Autowired
+    private AuthorService authorService;
+
+    private AuthorEntity author;
+
+    @BeforeEach
+    void createData() {
+        removeData();
+
+        author = authorService.create(new AuthorEntity("А.С. Пушкин"));
+        authorService.create(new AuthorEntity("А.П. Чехов"));
+
+    }
+
+    @AfterEach
+    void removeData() {
+        authorService.getAll().forEach(item -> authorService.delete(item.getId()));
+    }
+
+    @Test
+    void getTest() {
+        Assertions.assertThrows(NotFoundException.class, () -> authorService.get(0));
+    }
+
+    @Test
+    void createTest() {
+        Assertions.assertEquals(2, authorService.getAll().size());
+        Assertions.assertEquals(author, authorService.get(author.getId()));
+    }
+
+    @Test
+    void createNotUniqueTest() {
+        final AuthorEntity nonUniqueAuthor = new AuthorEntity("А.С. Пушкин");
+        Assertions.assertThrows(IllegalArgumentException.class, () -> authorService.create(nonUniqueAuthor));
+    }
+
+    @Test
+    void createNullableTest() {
+        final AuthorEntity nullableAuthor = new AuthorEntity(null);
+        Assertions.assertThrows(DataIntegrityViolationException.class, () -> authorService.create(
+                nullableAuthor));
+    }
+
+    @Test
+    void updateTest() {
+        final String newName = "TEST";
+        final String oldName = author.getName();
+        final AuthorEntity cat = new AuthorEntity(newName);
+        final AuthorEntity newEntity = authorService.update(author.getId(), cat);
+        Assertions.assertEquals(newName, newEntity.getName());
+        Assertions.assertNotEquals(oldName, newEntity.getName());
+    }
+
+    @Test
+    void deleteTest() {
+        authorService.delete(author.getId());
+        Assertions.assertEquals(1, authorService.getAll().size());
+
+        Assertions.assertNotEquals(3, authorService.getAll().size());
+    }
+}

lab3/src/test/java/com/example/demo/BookServiceTests.java

@@ -0,0 +1,146 @@
+package com.example.demo;
+
+import java.util.List;
+
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.MethodOrderer.OrderAnnotation;
+import org.junit.jupiter.api.Order;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestMethodOrder;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.dao.DataIntegrityViolationException;
+
+import com.example.demo.authors.model.AuthorEntity;
+import com.example.demo.authors.service.AuthorService;
+import com.example.demo.books.model.BookEntity;
+import com.example.demo.books.service.BookService;
+import com.example.demo.core.error.NotFoundException;
+import com.example.demo.genres.model.GenreEntity;
+import com.example.demo.genres.service.GenreService;
+
+@SpringBootTest
+@TestMethodOrder(OrderAnnotation.class)
+class BookServiceTests {
+    @Autowired
+    private BookService bookService;
+
+    private BookEntity book;
+    private BookEntity book2;
+    private BookEntity book3;
+    private BookEntity book4;
+
+    @Autowired
+    private GenreService genreService;
+
+    private GenreEntity genre;
+    private GenreEntity genre2;
+
+    @Autowired
+    private AuthorService authorService;
+
+    private AuthorEntity author;
+    private AuthorEntity author2;
+
+    @BeforeEach
+    void createData() {
+        removeData();
+
+        genre = genreService.create(new GenreEntity("Мемуары"));
+        genre2 = genreService.create(new GenreEntity("Фантастика"));
+
+        author = authorService.findByName("Вася Пупкин");
+        if (author == null) {
+            author = authorService.create(new AuthorEntity("Вася Пупкин"));
+        }
+
+        author2 = authorService.findByName("Петя Иванов");
+        if (author2 == null) {
+            author2 = authorService.create(new AuthorEntity("Петя Иванов"));
+        }
+
+        book = bookService.create(new BookEntity(genre, author, "Книга 1", "1", "Описание 1"));
+        book2 = bookService.create(new BookEntity(genre, author, "Книга 2", "2", "Описание 2"));
+        book3 = bookService.create(new BookEntity(genre2, author, "Книга 3", "3", "Описание 3"));
+        book4 = bookService.create(new BookEntity(genre, author2, "Книга 4", "4", "Описание 4"));
+    }
+
+    @AfterEach
+    void removeData() {
+        bookService.getAll(0, 0).forEach(item -> bookService.delete(item.getId()));
+        genreService.getAll().forEach(item -> genreService.delete(item.getId()));
+    }
+
+    @Test
+    @Order(1)
+    void getTest() {
+        Assertions.assertThrows(NotFoundException.class, () -> bookService.get(10L));
+    }
+
+    @Test
+    @Order(2)
+    void createTest() {
+        Assertions.assertEquals(2, bookService.getAll(genre.getId(), author.getId()).size());
+        Assertions.assertEquals(book, bookService.get(book.getId()));
+    }
+
+    @Test
+    @Order(3)
+    void createNullableTest() {
+        final BookEntity nullableGenre = new BookEntity(genre, null, "1", "1", "1");
+        Assertions.assertThrows(DataIntegrityViolationException.class, () -> bookService.create(
+                nullableGenre));
+    }
+
+    @Test
+    @Order(4)
+    void updateTest() {
+        final String newName = "TEST";
+        final String oldName = book.getName();
+        final BookEntity mov = new BookEntity(book.getGenre(), book.getAuthor(),
+                newName, book.getYear(), book.getDescription());
+        final BookEntity newEntity = bookService.update(book.getId(), mov);
+        Assertions.assertEquals(newName, newEntity.getName());
+        Assertions.assertNotEquals(oldName, newEntity.getName());
+    }
+
+    @Test
+    @Order(5)
+    void deleteTest() {
+        bookService.delete(book2.getId());
+        Assertions.assertEquals(1, bookService.getAll(genre.getId(),
+                author.getId()).size());
+
+        Assertions.assertNotEquals(3, bookService.getAll(genre.getId(),
+                author.getId()).size());
+    }
+
+    @Test
+    @Order(6)
+    void filterByGenreTest() {
+        List<BookEntity> books = bookService.getAll(genre.getId(), 0);
+        Assertions.assertFalse(books.isEmpty());
+        Assertions.assertTrue(books.stream().allMatch(b -> b.getGenre().equals(genre)));
+        Assertions.assertEquals(3, books.size());
+    }
+
+    @Test
+    @Order(7)
+    void filterByAuthorTest() {
+        List<BookEntity> books = bookService.getAll(0, author2.getId());
+        Assertions.assertFalse(books.isEmpty());
+        Assertions.assertTrue(books.stream().allMatch(b -> b.getAuthor().equals(author2)));
+        Assertions.assertEquals(1, books.size());
+    }
+
+    @Test
+    @Order(8)
+    void filterByGenreAndAuthorTest() {
+        List<BookEntity> books = bookService.getAll(genre.getId(), author.getId());
+        Assertions.assertFalse(books.isEmpty());
+        Assertions.assertTrue(books.stream().allMatch(b -> b.getGenre().equals(genre) && b.getAuthor().equals(author)));
+        Assertions.assertEquals(2, books.size());
+    }
+}

lab3/src/test/java/com/example/demo/FavoriteServiceTests.java

@@ -0,0 +1,115 @@
+package com.example.demo;
+
+import org.junit.jupiter.api.TestMethodOrder;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.MethodOrderer.OrderAnnotation;
+import org.junit.jupiter.api.Order;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import com.example.demo.authors.model.AuthorEntity;
+import com.example.demo.authors.service.AuthorService;
+import com.example.demo.books.model.BookEntity;
+import com.example.demo.books.service.BookService;
+import com.example.demo.favorites.model.FavoriteEntity;
+import com.example.demo.favorites.service.FavoriteService;
+import com.example.demo.genres.model.GenreEntity;
+import com.example.demo.genres.service.GenreService;
+import com.example.demo.users.model.UserEntity;
+import com.example.demo.users.service.UserService;
+
+@SpringBootTest
+@TestMethodOrder(OrderAnnotation.class)
+public class FavoriteServiceTests {
+
+    @Autowired
+    private FavoriteService favoriteService;
+
+    private FavoriteEntity lastFavorite;
+    private FavoriteEntity lastFavorite2;
+
+    private GenreEntity genre;
+    private AuthorEntity author;
+    private BookEntity book1;
+    private BookEntity book2;
+    private UserEntity user;
+
+    @Autowired
+    private GenreService genreService;
+
+    @Autowired
+    private AuthorService authorService;
+
+    @Autowired
+    private BookService bookService;
+
+    @Autowired
+    private UserService userService;
+
+    @BeforeEach
+    void createData() {
+        removeData();
+
+        genre = genreService.create(new GenreEntity("Трагедия"));
+        author = authorService.findByName("И.С. Тургенев");
+        if (author == null) {
+            author = authorService.create(new AuthorEntity("И.С. Тургенев"));
+        }
+
+        book1 = bookService.create(new BookEntity(genre, author, "какой-то фильм",
+                "1", "1"));
+        book2 = bookService.create(new BookEntity(genre, author, "2", "2", "2"));
+
+        user = userService.create(new UserEntity("elina", "123", true));
+
+        lastFavorite = favoriteService.create(new FavoriteEntity(null, user, book1));
+        lastFavorite2 = favoriteService.create(new FavoriteEntity(null, user,
+                book2));
+    }
+
+    @AfterEach
+    void removeData() {
+        favoriteService.getAll(0L).forEach(fv -> favoriteService.delete(fv.getId()));
+        userService.getAll().forEach(u -> userService.delete(u.getId()));
+        bookService.getAll(0, 0).forEach(item -> bookService.delete(item.getId()));
+        genreService.getAll().forEach(item -> genreService.delete(item.getId()));
+    }
+
+    @Test
+    void getTest() {
+        Assertions.assertThrows(NullPointerException.class, () -> favoriteService.get(0L)); // NotFoundException
+    }
+
+    @Test
+    void createTest() {
+        Assertions.assertEquals(2, favoriteService.getAll(user.getId()).size());
+    }
+
+    @Test
+    void update() {
+        final FavoriteEntity fav = favoriteService.create(new FavoriteEntity(null,
+                user, book2));
+
+        final FavoriteEntity oldFav = favoriteService.get(lastFavorite.getId());
+
+        final FavoriteEntity newFav = favoriteService.update(lastFavorite2.getId(),
+                fav);
+
+        Assertions.assertNotEquals(oldFav.getBook().getName(),
+                newFav.getBook().getName());
+
+    }
+
+    @Test
+
+    @Order(3)
+    void delete() {
+
+        favoriteService.delete(lastFavorite.getId());
+
+        Assertions.assertEquals(1, favoriteService.getAll(user.getId()).size());
+    }
+}

lab3/src/test/java/com/example/demo/GenreServiceTests.java

@@ -0,0 +1,77 @@
+package com.example.demo;
+
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.dao.DataIntegrityViolationException;
+
+import com.example.demo.core.error.NotFoundException;
+import com.example.demo.genres.model.GenreEntity;
+import com.example.demo.genres.service.GenreService;
+
+@SpringBootTest
+class GenreServiceTests {
+    @Autowired
+    private GenreService genreService;
+
+    private GenreEntity genre;
+
+    @BeforeEach
+    void createData() {
+        removeData();
+
+        genre = genreService.create(new GenreEntity("Drama"));
+        genreService.create(new GenreEntity("Comedy"));
+
+    }
+
+    @AfterEach
+    void removeData() {
+        genreService.getAll().forEach(item -> genreService.delete(item.getId()));
+    }
+
+    @Test
+    void getTest() {
+        Assertions.assertThrows(NotFoundException.class, () -> genreService.get(0));
+    }
+
+    @Test
+    void createTest() {
+        Assertions.assertEquals(2, genreService.getAll().size());
+        Assertions.assertEquals(genre, genreService.get(genre.getId()));
+    }
+
+    @Test
+    void createNotUniqueTest() {
+        final GenreEntity nonUniqueGenre = new GenreEntity("Drama");
+        Assertions.assertThrows(IllegalArgumentException.class, () -> genreService.create(nonUniqueGenre));
+    }
+
+    @Test
+    void createNullableTest() {
+        final GenreEntity nullableGenre = new GenreEntity(null);
+        Assertions.assertThrows(DataIntegrityViolationException.class, () -> genreService.create(
+                nullableGenre));
+    }
+
+    @Test
+    void updateTest() {
+        final String newName = "TEST";
+        final String oldName = genre.getName();
+        final GenreEntity cat = new GenreEntity(newName);
+        final GenreEntity newEntity = genreService.update(genre.getId(), cat);
+        Assertions.assertEquals(newName, newEntity.getName());
+        Assertions.assertNotEquals(oldName, newEntity.getName());
+    }
+
+    @Test
+    void deleteTest() {
+        genreService.delete(genre.getId());
+        Assertions.assertEquals(1, genreService.getAll().size());
+
+        Assertions.assertNotEquals(3, genreService.getAll().size());
+    }
+}

lab3/src/test/java/com/example/demo/UserServiceTests.java

@@ -0,0 +1,75 @@
+package com.example.demo;
+
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.MethodOrderer.OrderAnnotation;
+import org.junit.jupiter.api.Order;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestMethodOrder;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import com.example.demo.users.model.UserEntity;
+import com.example.demo.users.service.UserService;
+
+@SpringBootTest
+@TestMethodOrder(OrderAnnotation.class)
+class UserServiceTests {
+    @Autowired
+    private UserService userService;
+
+    private UserEntity firstUser;
+
+    @BeforeEach
+    void createData() {
+        removeData();
+
+        firstUser = userService.create(new UserEntity("elina", "123", true));
+        userService.create(new UserEntity("oleg", "789", false));
+        userService.create(new UserEntity("nikita", "456", false));
+
+    }
+
+    @AfterEach
+    void removeData() {
+        userService.getAll().forEach(item -> userService.delete(item.getId()));
+    }
+
+    @Test
+    void getTest() {
+        Assertions.assertThrows(NullPointerException.class, () -> userService.get(0L)); // NotFoundException
+    }
+
+    @Test
+
+    @Order(1)
+    void createTest() {
+
+        Assertions.assertEquals(firstUser, userService.get(firstUser.getId()));
+        Assertions.assertEquals(3, userService.getAll().size());
+    }
+
+    @Test
+
+    @Order(2)
+    void update() {
+        final String newPassword = "000";
+        final UserEntity existEntity = userService.get(firstUser.getId());
+        final String oldPassword = existEntity.getPassword();
+        final UserEntity entity = new UserEntity(existEntity.getUsername(),
+                newPassword, existEntity.getIsAdmin());
+        final UserEntity newEntity = userService.update(firstUser.getId(), entity);
+        Assertions.assertEquals(newPassword, newEntity.getPassword());
+        Assertions.assertNotEquals(oldPassword, newEntity.getPassword());
+
+    }
+
+    @Test
+
+    @Order(3)
+    void delete() {
+        userService.delete(firstUser.getId());
+        Assertions.assertEquals(2, userService.getAll().size());
+    }
+}

lab3/src/test/resources/application.properties

@@ -0,0 +1,14 @@
+# Server
+spring.main.banner-mode=off
+
+# Logger settings
+# Available levels are: TRACE, DEBUG, INFO, WARN, ERROR, FATAL, OFF
+logging.level.com.example.demo=DEBUG
+
+# JPA Settings
+spring.datasource.url=jdbc:h2:mem:testdb
+spring.datasource.username=sa
+spring.datasource.password=password
+spring.datasource.driver-class-name=org.h2.Driver
+spring.jpa.hibernate.ddl-auto=create
+spring.jpa.open-in-view=false

lab45/.gitignore

@@ -0,0 +1,36 @@
+HELP.md
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+data.*.db

lab45/.vscode/extensions.json

@@ -0,0 +1,12 @@
+{
+  "recommendations": [
+    // fronted
+    "AndersEAndersen.html-class-suggestions",
+    "dbaeumer.vscode-eslint",
+    // backend
+    "vscjava.vscode-java-pack",
+    "vmware.vscode-boot-dev-pack",
+    "vscjava.vscode-gradle",
+    "redhat.vscode-xml"
+  ]
+}

lab45/.vscode/launch.json

@@ -0,0 +1,14 @@
+{
+    "configurations": [
+        {
+            "type": "java",
+            "name": "Demo",
+            "request": "launch",
+            "cwd": "${workspaceFolder}",
+            "mainClass": "com.example.demo.DemoApplication",
+            "projectName": "lec6",
+            "args": "--populate",
+            "envFile": "${workspaceFolder}/.env"
+        }
+    ]
+}

lab45/.vscode/settings.json

@@ -0,0 +1,24 @@
+{
+    "editor.tabSize": 4,
+    "editor.detectIndentation": false,
+    "editor.insertSpaces": true,
+    "editor.formatOnPaste": true,
+    "editor.formatOnSave": true,
+    "editor.formatOnType": false,
+    "java.compile.nullAnalysis.mode": "disabled",
+    "java.configuration.updateBuildConfiguration": "automatic",
+    "[java]": {
+        "editor.pasteAs.enabled": false,
+    },
+    "gradle.nestedProjects": true,
+    "java.saveActions.organizeImports": true,
+    "java.dependency.packagePresentation": "hierarchical",
+    "spring-boot.ls.problem.boot2.JAVA_CONSTRUCTOR_PARAMETER_INJECTION": "WARNING",
+    "spring.initializr.defaultLanguage": "Java",
+    "java.format.settings.url": ".vscode/eclipse-formatter.xml",
+    "java.project.explorer.showNonJavaResources": true,
+    "java.codeGeneration.hashCodeEquals.useJava7Objects": true,
+    "cSpell.words": [
+        "classappend"
+    ],
+}

lab45/build.gradle

@@ -0,0 +1,51 @@
+plugins {
+	id 'java'
+	id 'org.springframework.boot' version '3.2.4'
+	id 'io.spring.dependency-management' version '1.1.4'
+}
+
+group = 'com.example'
+version = '0.0.1-SNAPSHOT'
+
+defaultTasks 'bootRun'
+
+jar {
+    enabled = false
+}
+
+bootJar {
+    archiveFileName = String.format('%s-%s.jar', rootProject.name, version)
+}
+
+assert System.properties['java.specification.version'] == '17' || '21'
+java {
+	sourceCompatibility = '17'
+}
+
+repositories {
+	mavenCentral()
+}
+
+dependencies {
+	implementation 'org.springframework.boot:spring-boot-starter-web'
+	implementation 'org.springframework.boot:spring-boot-starter-validation'
+	implementation 'org.modelmapper:modelmapper:3.2.0'
+
+	implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+	implementation 'com.h2database:h2:2.2.224'
+
+    implementation 'org.springframework.boot:spring-boot-devtools'
+    implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
+    implementation 'nz.net.ultraq.thymeleaf:thymeleaf-layout-dialect:3.3.0'
+    runtimeOnly 'org.webjars.npm:bootstrap:5.3.3'
+    runtimeOnly 'org.webjars.npm:bootstrap-icons:1.11.3'
+
+    implementation 'org.springframework.boot:spring-boot-starter-security'
+    implementation 'org.thymeleaf.extras:thymeleaf-extras-springsecurity6'
+
+	testImplementation 'org.springframework.boot:spring-boot-starter-test'
+}
+
+tasks.named('test') {
+	useJUnitPlatform()
+}

lab45/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

lab45/gradlew

@@ -0,0 +1,249 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

lab45/gradlew.bat

@@ -0,0 +1,92 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

lab45/readme.md

@@ -0,0 +1,15 @@
+H2 Console: \
+http://localhost:8080/h2-console
+
+JDBC URL: jdbc:h2:file:./data \
+User Name: sa \
+Password: password
+
+Почитать:
+
+- Spring Boot CRUD Application with Thymeleaf https://www.baeldung.com/spring-boot-crud-thymeleaf
+- Thymeleaf Layout Dialect https://ultraq.github.io/thymeleaf-layout-dialect/
+- Tutorial: Using Thymeleaf https://www.thymeleaf.org/doc/tutorials/3.1/usingthymeleaf.html#introducing-thymeleaf
+- Working with Cookies in Spring MVC using @CookieValue Annotation https://www.geeksforgeeks.org/working-with-cookies-in-spring-mvc-using-cookievalue-annotation/
+- Session Attributes in Spring MVC https://www.baeldung.com/spring-mvc-session-attributes
+- LazyInitializationException – What it is and the best way to fix it https://thorben-janssen.com/lazyinitializationexception/

lab45/settings.gradle

@@ -0,0 +1 @@
+rootProject.name = 'demo'

lab45/src/main/java/com/example/demo/DemoApplication.java

@@ -0,0 +1,93 @@
+package com.example.demo;
+
+import java.util.List;
+import java.util.Objects;
+import java.util.stream.IntStream;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+import com.example.demo.authors.model.AuthorEntity;
+import com.example.demo.authors.service.AuthorService;
+import com.example.demo.books.model.BookEntity;
+import com.example.demo.books.service.BookService;
+import com.example.demo.core.configuration.Constants;
+import com.example.demo.favorites.model.FavoriteEntity;
+import com.example.demo.favorites.service.FavoriteService;
+import com.example.demo.genres.model.GenreEntity;
+import com.example.demo.genres.service.GenreService;
+import com.example.demo.users.model.UserEntity;
+import com.example.demo.users.model.UserRole;
+import com.example.demo.users.service.UserService;
+
+@SpringBootApplication
+public class DemoApplication implements CommandLineRunner {
+    private final Logger log = LoggerFactory.getLogger(DemoApplication.class);
+
+    private final GenreService genreService;
+    private final AuthorService authorService;
+    private final BookService bookService;
+    private final UserService userService;
+    private final FavoriteService favoriteService;
+
+    public DemoApplication(
+            UserService userService,
+            GenreService genreService,
+            AuthorService authorService,
+            BookService bookService,
+            FavoriteService favoriteService) {
+        this.userService = userService;
+        this.genreService = genreService;
+        this.authorService = authorService;
+        this.bookService = bookService;
+        this.favoriteService = favoriteService;
+    }
+
+    public static void main(String[] args) {
+        SpringApplication.run(DemoApplication.class, args);
+    }
+
+    @Override
+    public void run(String... args) throws Exception {
+        if (args.length > 0 && Objects.equals("--populate", args[0])) {
+            log.info("Create default genre values");
+            final var genre1 = genreService.create(new GenreEntity("Детектив"));
+            final var genre2 = genreService.create(new GenreEntity("Роман"));
+            final var genre3 = genreService.create(new GenreEntity("Трагедия"));
+
+            log.info("Create default author values");
+            final var author1 = authorService.create(new AuthorEntity("А.С.Пушкин"));
+            final var author2 = authorService.create(new AuthorEntity("М.Ю.Леромонтов"));
+            final var author3 = authorService.create(new AuthorEntity("Л.Н.Толстой"));
+
+            log.info("Create default book values");
+            final var book1 = bookService.create(new BookEntity(
+                    genre1, author1, "Книга1", "1900", "описание1"));
+            final var book2 = bookService.create(new BookEntity(
+                    genre2, author2, "Книга2", "1890", "описание2"));
+            final var book3 = bookService.create(new BookEntity(
+                    genre3, author3, "Книга3", "1890", "описание3"));
+
+            log.info("Create default user values");
+            final var admin = new UserEntity("admin", "admin");
+            admin.setRole(UserRole.ADMIN);
+            userService.create(admin);
+
+            final var user1 = userService.create(new UserEntity("user1", Constants.DEFAULT_PASSWORD));
+
+            IntStream.range(2, 27)
+                    .forEach(value -> userService.create(
+                            new UserEntity("user".concat(String.valueOf(value)), Constants.DEFAULT_PASSWORD)));
+
+            log.info("Create default favorite values");
+            final var favorites = List.of(
+                    new FavoriteEntity(user1, book1),
+                    new FavoriteEntity(user1, book2),
+                    new FavoriteEntity(user1, book3));
+            favorites.forEach(favorite -> favoriteService.create(favorite, user1.getId()));
+        }
+    }
+}

lab45/src/main/java/com/example/demo/authors/api/AuthorController.java

@@ -0,0 +1,104 @@
+package com.example.demo.authors.api;
+
+import org.modelmapper.ModelMapper;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.validation.BindingResult;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.ModelAttribute;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+import com.example.demo.core.configuration.Constants;
+import com.example.demo.authors.model.AuthorEntity;
+import com.example.demo.authors.service.AuthorService;
+
+import jakarta.validation.Valid;
+
+@Controller
+@RequestMapping(AuthorController.URL)
+public class AuthorController {
+    public static final String URL = Constants.ADMIN_PREFIX + "/author";
+    private static final String AUTHOR_VIEW = "author";
+    private static final String AUTHOR_EDIT_VIEW = "author-edit";
+    private static final String AUTHOR_ATTRIBUTE = "author";
+
+    private final AuthorService authorService;
+    private final ModelMapper modelMapper;
+
+    public AuthorController(AuthorService authorService, ModelMapper modelMapper) {
+        this.authorService = authorService;
+        this.modelMapper = modelMapper;
+    }
+
+    private AuthorDto toDto(AuthorEntity entity) {
+        return modelMapper.map(entity, AuthorDto.class);
+    }
+
+    private AuthorEntity toEntity(AuthorDto dto) {
+        return modelMapper.map(dto, AuthorEntity.class);
+    }
+
+    @GetMapping
+    public String getAll(Model model) {
+        model.addAttribute(
+                "items",
+                authorService.getAll().stream()
+                        .map(this::toDto)
+                        .toList());
+        return AUTHOR_VIEW;
+    }
+
+    @GetMapping("/edit/")
+    public String create(Model model) {
+        model.addAttribute(AUTHOR_ATTRIBUTE, new AuthorDto());
+        return AUTHOR_EDIT_VIEW;
+    }
+
+    @PostMapping("/edit/")
+    public String create(
+            @ModelAttribute(name = AUTHOR_ATTRIBUTE) @Valid AuthorDto author,
+            BindingResult bindingResult,
+            Model model) {
+        if (bindingResult.hasErrors()) {
+            return AUTHOR_EDIT_VIEW;
+        }
+        authorService.create(toEntity(author));
+        return Constants.REDIRECT_VIEW + URL;
+    }
+
+    @GetMapping("/edit/{id}")
+    public String update(
+            @PathVariable(name = "id") Long id,
+            Model model) {
+        if (id <= 0) {
+            throw new IllegalArgumentException();
+        }
+        model.addAttribute(AUTHOR_ATTRIBUTE, toDto(authorService.get(id)));
+        return AUTHOR_EDIT_VIEW;
+    }
+
+    @PostMapping("/edit/{id}")
+    public String update(
+            @PathVariable(name = "id") Long id,
+            @ModelAttribute(name = AUTHOR_ATTRIBUTE) @Valid AuthorDto author,
+            BindingResult bindingResult,
+            Model model) {
+        if (bindingResult.hasErrors()) {
+            return AUTHOR_EDIT_VIEW;
+        }
+        if (id <= 0) {
+            throw new IllegalArgumentException();
+        }
+        authorService.update(id, toEntity(author));
+        return Constants.REDIRECT_VIEW + URL;
+    }
+
+    @PostMapping("/delete/{id}")
+    public String delete(
+            @PathVariable(name = "id") Long id) {
+        authorService.delete(id);
+        return Constants.REDIRECT_VIEW + URL;
+    }
+}

lab45/src/main/java/com/example/demo/authors/api/AuthorDto.java

@@ -0,0 +1,30 @@
+package com.example.demo.authors.api;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
+
+public class AuthorDto {
+    @JsonProperty(access = JsonProperty.Access.READ_ONLY)
+    private Long id;
+    @NotBlank
+    @Size(min = 5, max = 50)
+    private String name;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}

lab45/src/main/java/com/example/demo/authors/model/AuthorEntity.java

@@ -0,0 +1,53 @@
+package com.example.demo.authors.model;
+
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+
+import com.example.demo.books.model.BookEntity;
+import com.example.demo.core.model.BaseEntity;
+
+import jakarta.persistence.CascadeType;
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.OneToMany;
+import jakarta.persistence.Table;
+
+@Entity
+@Table(name = "authors")
+public class AuthorEntity extends BaseEntity {
+    @Column(nullable = false, unique = true, length = 50)
+    private String name;
+    @OneToMany(mappedBy = "author", cascade = CascadeType.ALL)
+    private Set<BookEntity> books = new HashSet<>();
+
+    public AuthorEntity() {
+    }
+
+    public AuthorEntity(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, name);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null || getClass() != obj.getClass())
+            return false;
+        final AuthorEntity other = (AuthorEntity) obj;
+        return Objects.equals(other.getId(), id) && Objects.equals(other.getName(), name);
+    }
+}

lab45/src/main/java/com/example/demo/authors/repository/AuthorRepository.java

@@ -0,0 +1,11 @@
+package com.example.demo.authors.repository;
+
+import java.util.Optional;
+
+import org.springframework.data.repository.CrudRepository;
+
+import com.example.demo.authors.model.AuthorEntity;
+
+public interface AuthorRepository extends CrudRepository<AuthorEntity, Long> {
+    Optional<AuthorEntity> findByNameIgnoreCase(String name);
+}

lab45/src/main/java/com/example/demo/authors/service/AuthorService.java

@@ -0,0 +1,68 @@
+package com.example.demo.authors.service;
+
+import java.util.List;
+import java.util.stream.StreamSupport;
+
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import com.example.demo.core.error.NotFoundException;
+import com.example.demo.authors.model.AuthorEntity;
+import com.example.demo.authors.repository.AuthorRepository;
+
+@Service
+public class AuthorService {
+    private final AuthorRepository repository;
+
+    public AuthorService(AuthorRepository repository) {
+        this.repository = repository;
+    }
+
+    private void checkName(String name) {
+        if (repository.findByNameIgnoreCase(name).isPresent()) {
+            throw new IllegalArgumentException(
+                    String.format("Author with name %s is already exists", name));
+        }
+    }
+
+    public AuthorEntity findByName(String name) {
+        return repository.findByNameIgnoreCase(name).orElse(null);
+    }
+
+    @Transactional(readOnly = true)
+    public List<AuthorEntity> getAll() {
+        return StreamSupport.stream(repository.findAll().spliterator(), false).toList();
+    }
+
+    @Transactional(readOnly = true)
+    public AuthorEntity get(long id) {
+        return repository.findById(id)
+                .orElseThrow(() -> new NotFoundException(AuthorEntity.class, id));
+    }
+
+    @Transactional
+    public AuthorEntity create(AuthorEntity entity) {
+        if (entity == null) {
+            throw new IllegalArgumentException("Entity is null");
+        }
+        checkName(entity.getName());
+        return repository.save(entity);
+    }
+
+    @Transactional
+    public AuthorEntity update(Long id, AuthorEntity entity) {
+        final AuthorEntity existsEntity = get(id);
+        if (!existsEntity.getName().equalsIgnoreCase(entity.getName())) {
+            checkName(entity.getName());
+        }
+        existsEntity.setName(entity.getName());
+        return repository.save(existsEntity);
+    }
+
+    @Transactional
+    public AuthorEntity delete(Long id) {
+        final AuthorEntity existsEntity = get(id);
+        repository.delete(existsEntity);
+        return existsEntity;
+    }
+}

lab45/src/main/java/com/example/demo/books/api/BookController.java

@@ -0,0 +1,186 @@
+package com.example.demo.books.api;
+
+import java.util.Map;
+
+import org.modelmapper.ModelMapper;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.validation.BindingResult;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.ModelAttribute;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.servlet.mvc.support.RedirectAttributes;
+
+import com.example.demo.core.api.PageAttributesMapper;
+import com.example.demo.core.configuration.Constants;
+import com.example.demo.authors.api.AuthorDto;
+import com.example.demo.authors.model.AuthorEntity;
+import com.example.demo.authors.service.AuthorService;
+import com.example.demo.books.model.BookEntity;
+import com.example.demo.books.service.BookService;
+import com.example.demo.genres.api.GenreDto;
+import com.example.demo.genres.model.GenreEntity;
+import com.example.demo.genres.service.GenreService;
+
+import jakarta.validation.Valid;
+
+@Controller
+@RequestMapping(BookController.URL)
+public class BookController {
+    public static final String URL = Constants.ADMIN_PREFIX + "/book";
+    private static final String BOOK_VIEW = "book";
+    private static final String BOOK_EDIT_VIEW = "book-edit";
+    private static final String BOOK_ATTRIBUTE = "book";
+
+    private static final String PAGE_ATTRIBUTE = "page";
+
+    private final BookService bookService;
+    private final GenreService genreService;
+    private final AuthorService authorService;
+    private final ModelMapper modelMapper;
+
+    public BookController(BookService bookService, GenreService genreService, AuthorService authorService,
+            ModelMapper modelMapper) {
+        this.bookService = bookService;
+        this.modelMapper = modelMapper;
+        this.genreService = genreService;
+        this.authorService = authorService;
+    }
+
+    private BookDto toDto(BookEntity entity) {
+        return modelMapper.map(entity, BookDto.class);
+    }
+
+    private BookEntity toEntity(BookDto dto) {
+        final BookEntity entity = modelMapper.map(dto, BookEntity.class);
+        entity.setGenre(genreService.get(dto.getGenreId()));
+        entity.setAuthor(authorService.get(dto.getAuthorId()));
+        return entity;
+    }
+
+    private GenreDto toGenreDto(GenreEntity entity) {
+        return modelMapper.map(entity, GenreDto.class);
+    }
+
+    private AuthorDto toAuthorDto(AuthorEntity entity) {
+        return modelMapper.map(entity, AuthorDto.class);
+    }
+
+    public String getAllBooks(@RequestParam(name = PAGE_ATTRIBUTE, defaultValue = "0") int page,
+            Model model) {
+
+        final Map<String, Object> attributes = PageAttributesMapper.toAttributes(
+                bookService.getAllBooks(page, Constants.DEFUALT_PAGE_SIZE), this::toDto);
+
+        model.addAllAttributes(attributes);
+        model.addAttribute(PAGE_ATTRIBUTE, page);
+
+        return BOOK_VIEW;
+    }
+
+    @GetMapping
+    public String getAll(@RequestParam(name = "genreId", defaultValue = "0") Long genreId,
+            @RequestParam(name = "authorId", defaultValue = "0") Long authorId,
+            @RequestParam(name = PAGE_ATTRIBUTE, defaultValue = "0") int page,
+            Model model) {
+        final Map<String, Object> attributes = PageAttributesMapper.toAttributes(
+                bookService.getAllBooks(page, Constants.DEFUALT_PAGE_SIZE), this::toDto);
+
+        // book.setGenreName(genreService.get(book.getGenreId()));
+
+        model.addAllAttributes(attributes);
+        model.addAttribute(PAGE_ATTRIBUTE, page);
+
+        model.addAttribute(
+                "genres",
+                genreService.getAll().stream().map(this::toGenreDto).toList());
+
+        model.addAttribute(
+                "authors",
+                authorService.getAll().stream().map(this::toAuthorDto).toList());
+
+        model.addAttribute(
+                "books",
+                bookService.getAllBooks(page, Constants.DEFUALT_PAGE_SIZE).stream().map(this::toDto).toList());
+
+        return BOOK_VIEW;
+    }
+
+    @GetMapping("/edit/")
+    public String create(@RequestParam(name = PAGE_ATTRIBUTE, defaultValue = "0") int page, Model model) {
+        model.addAttribute(BOOK_ATTRIBUTE, new BookDto());
+        model.addAttribute("genres", genreService.getAll().stream().map(this::toGenreDto).toList());
+        model.addAttribute("authors", authorService.getAll().stream().map(this::toAuthorDto).toList());
+        model.addAttribute(PAGE_ATTRIBUTE, page);
+        return BOOK_EDIT_VIEW;
+    }
+
+    @PostMapping("/edit/")
+    public String create(@RequestParam(name = PAGE_ATTRIBUTE, defaultValue = "0") int page,
+            @ModelAttribute(name = BOOK_ATTRIBUTE) @Valid BookDto book,
+            BindingResult bindingResult, Model model, RedirectAttributes redirectAttributes) {
+
+        if (bindingResult.hasErrors()) {
+            model.addAttribute(PAGE_ATTRIBUTE, page);
+            return BOOK_EDIT_VIEW;
+        }
+
+        redirectAttributes.addAttribute(PAGE_ATTRIBUTE, page);
+        bookService.create(toEntity(book));
+        return Constants.REDIRECT_VIEW + URL;
+    }
+
+    @GetMapping("/edit/{id}")
+    public String update(@PathVariable(name = "id") Long id,
+            @RequestParam(name = PAGE_ATTRIBUTE, defaultValue = "0") int page,
+            Model model) {
+
+        model.addAttribute(BOOK_ATTRIBUTE, toDto(bookService.get(id)));
+
+        model.addAttribute("books", bookService.getAllBooks().stream().map(this::toDto).toList());
+        model.addAttribute("genres", genreService.getAll().stream().map(this::toGenreDto).toList());
+        model.addAttribute("authors", authorService.getAll().stream().map(this::toAuthorDto).toList());
+        model.addAttribute(PAGE_ATTRIBUTE, page);
+        return BOOK_EDIT_VIEW;
+    }
+
+    @PostMapping("/edit/{id}")
+    public String update(@PathVariable(name = "id") Long id,
+            @RequestParam(name = PAGE_ATTRIBUTE, defaultValue = "0") int page,
+            @ModelAttribute(name = BOOK_ATTRIBUTE) @Valid BookDto book,
+            BindingResult bindingResult, Model model, RedirectAttributes redirectAttributes) {
+
+        if (bindingResult.hasErrors()) {
+            model.addAttribute(PAGE_ATTRIBUTE, page);
+            return BOOK_EDIT_VIEW;
+        }
+
+        if (id <= 0) {
+            throw new IllegalArgumentException();
+        }
+
+        model.addAttribute(
+                "genres",
+                genreService.getAll().stream().map(this::toGenreDto).toList());
+        model.addAttribute(
+                "authors",
+                authorService.getAll().stream().map(this::toAuthorDto).toList());
+
+        redirectAttributes.addAttribute(PAGE_ATTRIBUTE, page);
+        bookService.update(id, toEntity(book));
+        return Constants.REDIRECT_VIEW + URL;
+    }
+
+    @PostMapping("/delete/{id}")
+    public String delete(@PathVariable(name = "id") Long id,
+            @RequestParam(name = PAGE_ATTRIBUTE, defaultValue = "0") int page,
+            RedirectAttributes redirectAttributes) {
+        redirectAttributes.addAttribute(PAGE_ATTRIBUTE, page);
+        bookService.delete(id);
+
+        return Constants.REDIRECT_VIEW + URL;
+    }
+}

lab45/src/main/java/com/example/demo/books/api/BookDto.java

@@ -0,0 +1,92 @@
+package com.example.demo.books.api;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import jakarta.validation.constraints.Min;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Size;
+
+public class BookDto {
+    @JsonProperty(access = JsonProperty.Access.READ_ONLY)
+    private Long id;
+
+    @NotNull
+    @Min(1)
+    private Long genreId;
+
+    @NotNull
+    @Min(1)
+    private Long authorId;
+
+    @NotBlank
+    @Size(min = 2, max = 50)
+    private String name;
+
+    @NotBlank
+    @Size(min = 2, max = 4)
+    private String year;
+
+    @NotBlank
+    @Size(min = 2, max = 250)
+    private String description;
+
+    private boolean isFavourite;
+
+    @JsonProperty(access = JsonProperty.Access.READ_ONLY)
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Long getGenreId() {
+        return genreId;
+    }
+
+    public void setGenreId(Long genreId) {
+        this.genreId = genreId;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Long getAuthorId() {
+        return authorId;
+    }
+
+    public void setAuthorId(Long authorId) {
+        this.authorId = authorId;
+    }
+
+    public String getYear() {
+        return year;
+    }
+
+    public void setYear(String year) {
+        this.year = year;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    public boolean getIsFavourite() {
+        return isFavourite;
+    }
+
+    public void setIsFavourite(boolean flag) {
+        this.isFavourite = flag;
+    }
+}

lab45/src/main/java/com/example/demo/books/api/CatalogController.java

@@ -0,0 +1,118 @@
+package com.example.demo.books.api;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import org.modelmapper.ModelMapper;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+
+import com.example.demo.authors.api.AuthorDto;
+import com.example.demo.authors.model.AuthorEntity;
+import com.example.demo.authors.service.AuthorService;
+import com.example.demo.books.model.BookEntity;
+import com.example.demo.books.service.BookService;
+import com.example.demo.core.api.PageAttributesMapper;
+import com.example.demo.core.configuration.Constants;
+import com.example.demo.genres.api.GenreDto;
+import com.example.demo.genres.model.GenreEntity;
+import com.example.demo.genres.service.GenreService;
+
+@Controller
+@RequestMapping(CatalogController.URL)
+public class CatalogController {
+    private static final String CATALOG_VIEW = "catalog";
+    private static final String URL = "/catalog";
+
+    private static final String BOOK_ATTRIBUTE = "book";
+    private static final String BOOK_ONE = "book-one";
+
+    private static final String BOOK_RANDOM = "random-books";
+
+    private static final String GENREID_ATTRIBUTE = "genreId";
+    private static final String AUTHORID_ATTRIBUTE = "authorId";
+
+    private static final String PAGE_ATTRIBUTE = "page";
+
+    private final BookService bookService;
+    private final GenreService genreService;
+    private final AuthorService authorService;
+    private final ModelMapper modelMapper;
+
+    public CatalogController(BookService bookService, GenreService genreService,
+            AuthorService authorService, ModelMapper modelMapper) {
+        this.bookService = bookService;
+        this.modelMapper = modelMapper;
+        this.genreService = genreService;
+        this.authorService = authorService;
+    }
+
+    private BookDto toDto(BookEntity entity) {
+        return modelMapper.map(entity, BookDto.class);
+    }
+
+    private GenreDto toGenreDto(GenreEntity entity) {
+        return modelMapper.map(entity, GenreDto.class);
+    }
+
+    private AuthorDto toAuthorDto(AuthorEntity entity) {
+        return modelMapper.map(entity, AuthorDto.class);
+    }
+
+    @GetMapping
+    public String getCatalog(@RequestParam(name = PAGE_ATTRIBUTE, defaultValue = "0") int page,
+            @RequestParam(name = GENREID_ATTRIBUTE, defaultValue = "0") long genreId,
+            @RequestParam(name = AUTHORID_ATTRIBUTE, defaultValue = "0") long authorId,
+            Model model) {
+
+        model.addAttribute(PAGE_ATTRIBUTE, page);
+
+        model.addAllAttributes(PageAttributesMapper.toAttributes(
+                bookService.getAll(genreId, authorId, page, Constants.DEFUALT_PAGE_SIZE), this::toDto));
+
+        model.addAttribute(
+                "genres",
+                genreService.getAll().stream().map(this::toGenreDto).toList());
+        model.addAttribute("genreId", genreId);
+
+        model.addAttribute(
+                "authors",
+                authorService.getAll().stream().map(this::toAuthorDto).toList());
+        model.addAttribute("authorId", authorId);
+
+        return CATALOG_VIEW;
+    }
+
+    @GetMapping("/book-one/{id}")
+    public String getOne(@PathVariable(name = "id") Long id,
+            @RequestParam(name = PAGE_ATTRIBUTE, defaultValue = "0") int page,
+            Model model) {
+
+        model.addAttribute(BOOK_ATTRIBUTE, toDto(bookService.get(id)));
+
+        model.addAttribute("books", bookService.getAllBooks().stream().map(this::toDto).toList());
+        model.addAttribute("genres", genreService.getAll().stream().map(this::toGenreDto).toList());
+        model.addAttribute("authors", authorService.getAll().stream().map(this::toAuthorDto).toList());
+        model.addAttribute(PAGE_ATTRIBUTE, page);
+        return BOOK_ONE;
+    }
+
+    @GetMapping("/random-books")
+    public String getRandomBooks(@RequestParam(name = PAGE_ATTRIBUTE, defaultValue = "0") int page, Model model) {
+        List<BookDto> allBooks = bookService.getAllBooks().stream().map(this::toDto).collect(Collectors.toList());
+        Collections.shuffle(allBooks);
+        List<BookDto> randomBooks = allBooks.stream().limit(3).collect(Collectors.toList());
+
+        model.addAttribute("randomBooks", randomBooks);
+        model.addAttribute("genres", genreService.getAll().stream().map(this::toGenreDto).toList());
+        model.addAttribute("authors", authorService.getAll().stream().map(this::toAuthorDto).toList());
+        model.addAttribute(PAGE_ATTRIBUTE, page);
+
+        return BOOK_RANDOM;
+    }
+}

lab45/src/main/java/com/example/demo/books/model/BookEntity.java

@@ -0,0 +1,102 @@
+package com.example.demo.books.model;
+
+import java.util.Objects;
+
+import com.example.demo.authors.model.AuthorEntity;
+import com.example.demo.core.model.BaseEntity;
+import com.example.demo.genres.model.GenreEntity;
+
+import jakarta.persistence.CascadeType;
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.Table;
+
+@Entity
+@Table(name = "books")
+public class BookEntity extends BaseEntity {
+    @ManyToOne
+    @JoinColumn(name = "genreId", nullable = false)
+    private GenreEntity genre;
+    @ManyToOne
+    @JoinColumn(name = "authorId", nullable = false)
+    private AuthorEntity author;
+    @Column(nullable = false, length = 50)
+    private String name;
+    @Column(name = "years", nullable = false, length = 4)
+    private String year;
+    @Column(nullable = false, length = 250)
+    private String description;
+
+    public BookEntity() {
+    }
+
+    public BookEntity(GenreEntity genre, AuthorEntity author, String name, String year, String description) {
+        this.genre = genre;
+        this.name = name;
+        this.author = author;
+        this.year = year;
+        this.description = description;
+    }
+
+    public GenreEntity getGenre() {
+        return genre;
+    }
+
+    public void setGenre(GenreEntity genre) {
+        this.genre = genre;
+    }
+
+    public AuthorEntity getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(AuthorEntity author) {
+        this.author = author;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getYear() {
+        return year;
+    }
+
+    public void setYear(String year) {
+        this.year = year;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, genre, name, author, year, description);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null || getClass() != obj.getClass())
+            return false;
+        final BookEntity other = (BookEntity) obj;
+        return Objects.equals(other.getId(), id)
+                && Objects.equals(other.getGenre(), genre)
+                && Objects.equals(other.getName(), name)
+                && Objects.equals(other.getAuthor(), author)
+                && Objects.equals(other.getYear(), year)
+                && Objects.equals(other.getDescription(), description);
+    }
+}

lab45/src/main/java/com/example/demo/books/repository/BookRepository.java

@@ -0,0 +1,28 @@
+package com.example.demo.books.repository;
+
+import java.util.Optional;
+import java.util.List;
+
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.repository.CrudRepository;
+import org.springframework.data.repository.PagingAndSortingRepository;
+
+import com.example.demo.books.model.BookEntity;
+
+public interface BookRepository
+        extends CrudRepository<BookEntity, Long>, PagingAndSortingRepository<BookEntity, Long> {
+    Optional<BookEntity> findByNameIgnoreCase(String name);
+
+    List<BookEntity> findByGenreId(Long genreId);
+
+    Page<BookEntity> findByGenreId(Long genreId, Pageable pageable);
+
+    List<BookEntity> findByAuthorId(Long authorId);
+
+    Page<BookEntity> findByAuthorId(Long authorId, Pageable pageable);
+
+    List<BookEntity> findByGenreIdAndAuthorId(Long genreId, Long authorId);
+
+    Page<BookEntity> findByGenreIdAndAuthorId(Long genreId, Long authorId, Pageable pageable);
+}

lab45/src/main/java/com/example/demo/books/service/BookService.java

@@ -0,0 +1,93 @@
+package com.example.demo.books.service;
+
+import java.util.List;
+import java.util.stream.StreamSupport;
+
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Sort;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import com.example.demo.core.error.NotFoundException;
+import com.example.demo.books.model.BookEntity;
+import com.example.demo.books.repository.BookRepository;
+
+@Service
+public class BookService {
+    private final BookRepository repository;
+
+    public BookService(BookRepository repository) {
+        this.repository = repository;
+    }
+
+    @Transactional(readOnly = true)
+    public List<BookEntity> getAllBooks() {
+        return StreamSupport.stream(repository.findAll().spliterator(), false).toList();
+    }
+
+    @Transactional(readOnly = true)
+    public Page<BookEntity> getAllBooks(int page, int size) {
+        return repository.findAll(PageRequest.of(page, size, Sort.by("id")));
+    }
+
+    @Transactional(readOnly = true)
+    public List<BookEntity> getAll(long genreId, long authorId) {
+        if (genreId == 0L && authorId == 0L) {
+            return StreamSupport.stream(repository.findAll().spliterator(), false).toList();
+        } else if (genreId == 0L) {
+            return repository.findByAuthorId(authorId);
+        } else if (authorId == 0L) {
+            return repository.findByGenreId(genreId);
+        } else {
+            return repository.findByGenreIdAndAuthorId(genreId, authorId);
+        }
+    }
+
+    @Transactional(readOnly = true)
+    public Page<BookEntity> getAll(long genreId, long authorId, int page, int size) {
+        final Pageable pageRequest = PageRequest.of(page, size);
+        if (genreId == 0L && authorId == 0L) {
+            return repository.findAll(pageRequest);
+        } else if (genreId == 0L) {
+            return repository.findByAuthorId(authorId, pageRequest);
+        } else if (authorId == 0L) {
+            return repository.findByGenreId(genreId, pageRequest);
+        } else {
+            return repository.findByGenreIdAndAuthorId(genreId, authorId, pageRequest);
+        }
+    }
+
+    @Transactional(readOnly = true)
+    public BookEntity get(long id) {
+        return repository.findById(id)
+                .orElseThrow(() -> new NotFoundException(BookEntity.class, id));
+    }
+
+    @Transactional
+    public BookEntity create(BookEntity entity) {
+        if (entity == null) {
+            throw new IllegalArgumentException("Entity is null");
+        }
+        return repository.save(entity);
+    }
+
+    @Transactional
+    public BookEntity update(Long id, BookEntity entity) {
+        final BookEntity existsEntity = get(id);
+        existsEntity.setName(entity.getName());
+        existsEntity.setAuthor(entity.getAuthor());
+        existsEntity.setGenre(entity.getGenre());
+        existsEntity.setYear(entity.getYear());
+        existsEntity.setDescription(entity.getDescription());
+        return repository.save(existsEntity);
+    }
+
+    @Transactional
+    public BookEntity delete(Long id) {
+        final BookEntity existsEntity = get(id);
+        repository.delete(existsEntity);
+        return existsEntity;
+    }
+}

lab45/src/main/java/com/example/demo/core/api/GlobalController.java

@@ -0,0 +1,28 @@
+package com.example.demo.core.api;
+
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ModelAttribute;
+
+// import com.example.demo.core.session.SessionCart;
+
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpSession;
+
+@ControllerAdvice
+public class GlobalController {
+    // private final SessionCart cart;
+
+    // public GlobalController(SessionCart cart) {
+    // this.cart = cart;
+    // }
+
+    @ModelAttribute("servletPath")
+    String getRequestServletPath(HttpServletRequest request) {
+        return request.getServletPath();
+    }
+
+    // @ModelAttribute("totalCart")
+    // double getTotalCart(HttpSession session) {
+    // return cart.getSum();
+    // }
+}

lab45/src/main/java/com/example/demo/core/api/PageAttributesMapper.java

@@ -0,0 +1,18 @@
+package com.example.demo.core.api;
+
+import java.util.Map;
+import java.util.function.Function;
+
+import org.springframework.data.domain.Page;
+
+public class PageAttributesMapper {
+    private PageAttributesMapper() {
+    }
+
+    public static <E, D> Map<String, Object> toAttributes(Page<E> page, Function<E, D> mapper) {
+        return Map.of(
+                "items", page.getContent().stream().map(mapper::apply).toList(),
+                "currentPage", page.getNumber(),
+                "totalPages", page.getTotalPages());
+    }
+}

lab45/src/main/java/com/example/demo/core/configuration/Constants.java

@@ -0,0 +1,19 @@
+package com.example.demo.core.configuration;
+
+public class Constants {
+    public static final String SEQUENCE_NAME = "hibernate_sequence";
+
+    public static final int DEFUALT_PAGE_SIZE = 5;
+
+    public static final String REDIRECT_VIEW = "redirect:";
+
+    public static final String ADMIN_PREFIX = "/admin";
+
+    public static final String LOGIN_URL = "/login";
+    public static final String LOGOUT_URL = "/logout";
+
+    public static final String DEFAULT_PASSWORD = "123456";
+
+    private Constants() {
+    }
+}

lab45/src/main/java/com/example/demo/core/configuration/MapperConfiguration.java

@@ -0,0 +1,23 @@
+package com.example.demo.core.configuration;
+
+import org.modelmapper.ModelMapper;
+import org.modelmapper.PropertyMap;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import com.example.demo.core.model.BaseEntity;
+
+@Configuration
+public class MapperConfiguration {
+    @Bean
+    ModelMapper modelMapper() {
+        final ModelMapper mapper = new ModelMapper();
+        mapper.addMappings(new PropertyMap<Object, BaseEntity>() {
+            @Override
+            protected void configure() {
+                skip(destination.getId());
+            }
+        });
+        return mapper;
+    }
+}

lab45/src/main/java/com/example/demo/core/configuration/WebConfiguration.java

@@ -0,0 +1,14 @@
+package com.example.demo.core.configuration;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+@Configuration
+public class WebConfiguration implements WebMvcConfigurer {
+    @Override
+    public void addViewControllers(ViewControllerRegistry registry) {
+        registry.addViewController("/login").setViewName("login");
+        registry.addViewController("/").setViewName("home");
+    }
+}

lab45/src/main/java/com/example/demo/core/error/AdviceController.java

@@ -0,0 +1,53 @@
+package com.example.demo.core.error;
+
+import java.util.Map;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.core.annotation.AnnotationUtils;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.servlet.ModelAndView;
+
+import jakarta.servlet.http.HttpServletRequest;
+
+@ControllerAdvice
+public class AdviceController {
+    private final Logger log = LoggerFactory.getLogger(AdviceController.class);
+
+    private static Throwable getRootCause(Throwable throwable) {
+        Throwable rootCause = throwable;
+        while (rootCause.getCause() != null && rootCause.getCause() != rootCause) {
+            rootCause = rootCause.getCause();
+        }
+        return rootCause;
+    }
+
+    private static Map<String, Object> getAttributes(HttpServletRequest request, Throwable throwable) {
+        final Throwable rootCause = getRootCause(throwable);
+        final StackTraceElement firstError = rootCause.getStackTrace()[0];
+        return Map.of(
+                "message", rootCause.getMessage(),
+                "url", request.getRequestURL(),
+                "exception", rootCause.getClass().getName(),
+                "file", firstError.getFileName(),
+                "method", firstError.getMethodName(),
+                "line", firstError.getLineNumber());
+    }
+
+    @ExceptionHandler(value = Exception.class)
+    public ModelAndView defaultErrorHandler(HttpServletRequest request, Throwable throwable) throws Throwable {
+        if (AnnotationUtils.findAnnotation(throwable.getClass(),
+                ResponseStatus.class) != null) {
+            throw throwable;
+        }
+
+        log.error("{}", throwable.getMessage());
+        throwable.printStackTrace();
+        final ModelAndView model = new ModelAndView();
+        model.addAllObjects(getAttributes(request, throwable));
+        model.setViewName("error");
+        return model;
+    }
+}

lab45/src/main/java/com/example/demo/core/error/NotFoundException.java

@@ -0,0 +1,7 @@
+package com.example.demo.core.error;
+
+public class NotFoundException extends RuntimeException {
+    public <T> NotFoundException(Class<T> clazz, Long id) {
+        super(String.format("%s with id [%s] is not found or not exists", clazz.getSimpleName(), id));
+    }
+}

lab45/src/main/java/com/example/demo/core/model/BaseEntity.java

@@ -0,0 +1,28 @@
+package com.example.demo.core.model;
+
+import com.example.demo.core.configuration.Constants;
+
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.MappedSuperclass;
+import jakarta.persistence.SequenceGenerator;
+
+@MappedSuperclass
+public abstract class BaseEntity {
+    @Id
+    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = Constants.SEQUENCE_NAME)
+    @SequenceGenerator(name = Constants.SEQUENCE_NAME, sequenceName = Constants.SEQUENCE_NAME, allocationSize = 1)
+    protected Long id;
+
+    protected BaseEntity() {
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+}

lab45/src/main/java/com/example/demo/core/security/SecurityConfiguration.java

@@ -0,0 +1,63 @@
+package com.example.demo.core.security;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.authentication.dao.DaoAuthenticationProvider;
+import org.springframework.security.config.Customizer;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
+import org.springframework.security.config.annotation.web.configurers.AbstractHttpConfigurer;
+import org.springframework.security.config.annotation.web.configurers.HeadersConfigurer.FrameOptionsConfig;
+import org.springframework.security.core.userdetails.UserDetailsService;
+import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.security.web.SecurityFilterChain;
+
+import com.example.demo.core.configuration.Constants;
+import com.example.demo.users.api.UserSignupController;
+import com.example.demo.users.model.UserRole;
+
+@Configuration
+@EnableWebSecurity
+public class SecurityConfiguration {
+    @Bean
+    SecurityFilterChain filterChain(HttpSecurity httpSecurity) throws Exception {
+        httpSecurity.headers(headers -> headers.frameOptions(FrameOptionsConfig::sameOrigin));
+        httpSecurity.csrf(AbstractHttpConfigurer::disable);
+        httpSecurity.cors(Customizer.withDefaults());
+
+        httpSecurity.authorizeHttpRequests(requests -> requests
+                .requestMatchers("/css/**", "/webjars/**", "/*.svg")
+                .permitAll());
+
+        httpSecurity.authorizeHttpRequests(requests -> requests
+                .requestMatchers(Constants.ADMIN_PREFIX + "/**").hasRole(UserRole.ADMIN.name())
+                .requestMatchers("/h2-console/**").hasRole(UserRole.ADMIN.name())
+                .requestMatchers(UserSignupController.URL).anonymous()
+                .requestMatchers(Constants.LOGIN_URL).anonymous()
+                .anyRequest().authenticated());
+
+        httpSecurity.formLogin(formLogin -> formLogin
+                .loginPage(Constants.LOGIN_URL));
+
+        httpSecurity.rememberMe(rememberMe -> rememberMe.key("uniqueAndSecret"));
+
+        httpSecurity.logout(logout -> logout
+                .deleteCookies("JSESSIONID"));
+
+        return httpSecurity.build();
+    }
+
+    @Bean
+    DaoAuthenticationProvider authenticationProvider(UserDetailsService userDetailsService) {
+        final DaoAuthenticationProvider authProvider = new DaoAuthenticationProvider();
+        authProvider.setUserDetailsService(userDetailsService);
+        authProvider.setPasswordEncoder(passwordEncoder());
+        return authProvider;
+    }
+
+    @Bean
+    PasswordEncoder passwordEncoder() {
+        return new BCryptPasswordEncoder();
+    }
+}

lab45/src/main/java/com/example/demo/core/security/UserPrincipal.java

@@ -0,0 +1,64 @@
+package com.example.demo.core.security;
+
+import java.util.Collection;
+import java.util.Set;
+
+import org.springframework.security.core.GrantedAuthority;
+import org.springframework.security.core.userdetails.UserDetails;
+
+import com.example.demo.users.model.UserEntity;
+
+public class UserPrincipal implements UserDetails {
+    private final long id;
+    private final String username;
+    private final String password;
+    private final Set<? extends GrantedAuthority> roles;
+    private final boolean active;
+
+    public UserPrincipal(UserEntity user) {
+        this.id = user.getId();
+        this.username = user.getLogin();
+        this.password = user.getPassword();
+        this.roles = Set.of(user.getRole());
+        this.active = true;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    @Override
+    public String getUsername() {
+        return username;
+    }
+
+    @Override
+    public String getPassword() {
+        return password;
+    }
+
+    @Override
+    public Collection<? extends GrantedAuthority> getAuthorities() {
+        return roles;
+    }
+
+    @Override
+    public boolean isEnabled() {
+        return active;
+    }
+
+    @Override
+    public boolean isAccountNonExpired() {
+        return isEnabled();
+    }
+
+    @Override
+    public boolean isAccountNonLocked() {
+        return isEnabled();
+    }
+
+    @Override
+    public boolean isCredentialsNonExpired() {
+        return isEnabled();
+    }
+}

lab45/src/main/java/com/example/demo/core/session/SessionCart.java

@@ -0,0 +1,14 @@
+// package com.example.demo.core.session;
+
+// import java.util.HashMap;
+
+// import com.example.demo.users.api.UserCartDto;
+
+// public class SessionCart extends HashMap<Integer, UserCartDto> {
+// public double getSum() {
+// return this.values().stream()
+// .map(item -> item.getCount() * item.getPrice())
+// .mapToDouble(Double::doubleValue)
+// .sum();
+// }
+// }

lab45/src/main/java/com/example/demo/core/session/SessionHelper.java

@@ -0,0 +1,17 @@
+// package com.example.demo.core.session;
+
+// import org.springframework.context.annotation.Bean;
+// import org.springframework.context.annotation.Configuration;
+// import org.springframework.context.annotation.Scope;
+// import org.springframework.context.annotation.ScopedProxyMode;
+// import org.springframework.web.context.WebApplicationContext;
+
+// @Configuration
+// public class SessionHelper {
+// @Bean
+// @Scope(value = WebApplicationContext.SCOPE_SESSION, proxyMode =
+// ScopedProxyMode.TARGET_CLASS)
+// SessionCart todos() {
+// return new SessionCart();
+// }
+// }

lab45/src/main/java/com/example/demo/favorites/api/FavoriteController.java

@@ -0,0 +1,151 @@
+package com.example.demo.favorites.api;
+
+import java.util.List;
+import java.util.Map;
+import java.util.HashMap;
+import java.util.stream.Collectors;
+
+import org.modelmapper.ModelMapper;
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.validation.BindingResult;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.ModelAttribute;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.servlet.mvc.support.RedirectAttributes;
+
+import com.example.demo.core.api.PageAttributesMapper;
+import com.example.demo.core.configuration.Constants;
+import com.example.demo.core.security.UserPrincipal;
+import com.example.demo.favorites.model.FavoriteEntity;
+import com.example.demo.favorites.service.FavoriteService;
+import com.example.demo.genres.api.GenreDto;
+import com.example.demo.genres.model.GenreEntity;
+import com.example.demo.genres.service.GenreService;
+import com.example.demo.authors.api.AuthorDto;
+import com.example.demo.authors.model.AuthorEntity;
+import com.example.demo.authors.service.AuthorService;
+import com.example.demo.books.api.BookDto;
+import com.example.demo.books.model.BookEntity;
+import com.example.demo.books.service.BookService;
+import com.example.demo.users.api.UserDto;
+import com.example.demo.users.model.UserEntity;
+import com.example.demo.users.service.UserService;
+
+import jakarta.validation.Valid;
+
+@Controller
+@RequestMapping(FavoriteController.URL)
+public class FavoriteController {
+
+    public static final String URL = "/favorite";
+    private static final String FAVORITE_VIEW = "favorite";
+    private static final String FAVORITE_EDIT_VIEW = "favorite-edit";
+    private static final String FAVORITE_ATTRIBUTE = "favorite";
+    private static final String FAVORITE_DETAILS_VIEW = "favorite-details";
+
+    protected static final String PAGE_ATTRIBUTE = "page";
+    protected String REDIRECT_AFTER_FAVOURITE_CLICK_PATH;
+    protected static final String GENREID_ATTRIBUTE = "genreId";
+    protected static final String AUTHORID_ATTRIBUTE = "authorId";
+
+    private final FavoriteService favoriteService;
+    private final UserService userService;
+    private final BookService bookService;
+    private final AuthorService authorService;
+    private final GenreService genreService;
+    private final ModelMapper modelMapper;
+
+    public FavoriteController(FavoriteService favoriteService, UserService userService,
+            BookService bookService, AuthorService authorService, GenreService genreService, ModelMapper modelMapper) {
+        this.modelMapper = modelMapper;
+        this.userService = userService;
+        this.favoriteService = favoriteService;
+        this.bookService = bookService;
+        this.authorService = authorService;
+        this.genreService = genreService;
+    }
+
+    private FavoriteDto toDto(FavoriteEntity entity) {
+        return modelMapper.map(entity, FavoriteDto.class);
+    }
+
+    private FavoriteEntity toEntity(FavoriteDto dto) {
+        final FavoriteEntity entity = modelMapper.map(dto, FavoriteEntity.class);
+        entity.setBook(bookService.get(dto.getBookId()));
+        // entity.setUser(userService.get(dto.getUserId()));
+        return entity;
+    }
+
+    private UserDto toUserDto(UserEntity entity) {
+        return modelMapper.map(entity, UserDto.class);
+    }
+
+    private BookDto toBookDto(BookEntity entity, Long userId) {
+        BookDto dto = modelMapper.map(entity, BookDto.class);
+        dto.setIsFavourite(true);
+        dto.setGenreId(entity.getGenre().getId());
+        return dto;
+    }
+
+    private GenreDto toGenreDto(GenreEntity entity) {
+        return modelMapper.map(entity, GenreDto.class);
+    }
+
+    private AuthorDto toAuthorDto(AuthorEntity entity) {
+        return modelMapper.map(entity, AuthorDto.class);
+    }
+
+    @GetMapping
+    public String getAll(
+            @RequestParam(name = PAGE_ATTRIBUTE, defaultValue = "0") int page,
+            @RequestParam(name = GENREID_ATTRIBUTE, defaultValue = "0") Long genreId,
+            @RequestParam(name = AUTHORID_ATTRIBUTE, defaultValue = "0") Long authorId,
+            Model model,
+            @AuthenticationPrincipal UserPrincipal principal) {
+        final Map<String, Object> attributes = PageAttributesMapper.toAttributes(
+                favoriteService.getAll(principal.getId(), page,
+                        Constants.DEFUALT_PAGE_SIZE),
+                book -> toBookDto(book.getBook(), principal.getId()));
+        model.addAllAttributes(attributes);
+        model.addAttribute(PAGE_ATTRIBUTE, page);
+
+        model.addAttribute("genres",
+                genreService.getAll().stream()
+                        .map(this::toGenreDto)
+                        .toList());
+
+        model.addAttribute(GENREID_ATTRIBUTE, genreId);
+
+        model.addAttribute("authors",
+                authorService.getAll().stream()
+                        .map(this::toAuthorDto)
+                        .toList());
+
+        model.addAttribute(GENREID_ATTRIBUTE, authorId);
+
+        return FAVORITE_VIEW;
+    }
+
+    @PostMapping
+    public String toggleFavourite(
+            Model model,
+            @RequestParam(name = "id") Long bookId,
+            @RequestParam(name = "isFavourite") boolean isFavourite,
+            @AuthenticationPrincipal UserPrincipal principal) {
+        if (bookId <= 0) {
+            throw new IllegalArgumentException();
+        }
+
+        favoriteService.toggle(principal.getId(), bookId, isFavourite);
+        return Constants.REDIRECT_VIEW + REDIRECT_AFTER_FAVOURITE_CLICK_PATH;
+    }
+}

lab45/src/main/java/com/example/demo/favorites/api/FavoriteDto.java

@@ -0,0 +1,45 @@
+package com.example.demo.favorites.api;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import jakarta.validation.constraints.Min;
+import jakarta.validation.constraints.NotNull;
+
+public class FavoriteDto {
+
+    @JsonProperty(access = JsonProperty.Access.READ_ONLY)
+    private Long id;
+
+    @NotNull
+    @Min(1)
+    private Long userId;
+
+    @NotNull
+    @Min(1)
+    private Long bookId;
+
+    @JsonProperty(access = JsonProperty.Access.READ_ONLY)
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Long getUserId() {
+        return userId;
+    }
+
+    public void setUserId(Long userId) {
+        this.userId = userId;
+    }
+
+    public Long getBookId() {
+        return bookId;
+    }
+
+    public void setBookId(Long bookId) {
+        this.bookId = bookId;
+    }
+}

lab45/src/main/java/com/example/demo/favorites/model/FavoriteEntity.java

@@ -0,0 +1,66 @@
+package com.example.demo.favorites.model;
+
+import java.util.Objects;
+
+import com.example.demo.books.model.BookEntity;
+import com.example.demo.core.model.BaseEntity;
+import com.example.demo.users.model.UserEntity;
+
+import jakarta.persistence.CascadeType;
+import jakarta.persistence.Entity;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.Table;
+
+@Entity
+@Table(name = "favorites")
+public class FavoriteEntity extends BaseEntity {
+    @ManyToOne(cascade = CascadeType.REMOVE)
+    @JoinColumn(name = "userId", nullable = false)
+    private UserEntity user;
+
+    @ManyToOne(cascade = CascadeType.REMOVE)
+    @JoinColumn(name = "bookId", nullable = false)
+    private BookEntity book;
+
+    public FavoriteEntity() {
+    }
+
+    public FavoriteEntity(UserEntity user, BookEntity book) {
+        this.user = user;
+        this.book = book;
+    }
+
+    public UserEntity getUser() {
+        return user;
+    }
+
+    public void setUser(UserEntity user) {
+        this.user = user;
+    }
+
+    public BookEntity getBook() {
+        return book;
+    }
+
+    public void setBook(BookEntity book) {
+        this.book = book;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, user, book);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null || getClass() != obj.getClass())
+            return false;
+        final FavoriteEntity other = (FavoriteEntity) obj;
+        return Objects.equals(other.getId(), id)
+                && Objects.equals(other.getUser(), user)
+                && Objects.equals(other.getBook(), book);
+    }
+}

lab45/src/main/java/com/example/demo/favorites/repository/FavoriteRepository.java

@@ -0,0 +1,24 @@
+package com.example.demo.favorites.repository;
+
+import java.util.List;
+import java.util.Optional;
+
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.repository.CrudRepository;
+import org.springframework.data.repository.PagingAndSortingRepository;
+
+import com.example.demo.favorites.model.FavoriteEntity;
+
+public interface FavoriteRepository extends CrudRepository<FavoriteEntity, Long>,
+        PagingAndSortingRepository<FavoriteEntity, Long> {
+    List<FavoriteEntity> findByUserId(Long userId);
+
+    List<FavoriteEntity> findByUserId(long userId);
+
+    Page<FavoriteEntity> findByUserId(long userId, Pageable pageable);
+
+    List<FavoriteEntity> findByUserIdAndBookId(long userId, long bookId);
+
+    Optional<FavoriteEntity> findOneByUserIdAndId(long userId, long bookId);
+}

lab45/src/main/java/com/example/demo/favorites/service/FavoriteService.java

@@ -0,0 +1,92 @@
+package com.example.demo.favorites.service;
+
+import java.util.List;
+import java.util.stream.StreamSupport;
+
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.domain.Pageable;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import com.example.demo.books.service.BookService;
+import com.example.demo.core.error.NotFoundException;
+import com.example.demo.favorites.model.FavoriteEntity;
+import com.example.demo.favorites.repository.FavoriteRepository;
+import com.example.demo.users.service.UserService;
+
+@Service
+public class FavoriteService {
+    private final FavoriteRepository repository;
+    private final UserService userService;
+    private final BookService bookService;
+
+    public FavoriteService(FavoriteRepository repository, UserService userService, BookService bookService) {
+        this.repository = repository;
+        this.userService = userService;
+        this.bookService = bookService;
+    }
+
+    @Transactional(readOnly = true)
+    public List<FavoriteEntity> getAll(Long userId) {
+        if (userId == 0) {
+            return StreamSupport.stream(repository.findAll().spliterator(), false).toList();
+        }
+        return repository.findByUserId(userId);
+    }
+
+    @Transactional(readOnly = true)
+    public Page<FavoriteEntity> getAll(Long userId, int page, int size) {
+        final Pageable pageRequest = PageRequest.of(page, size);
+        if (userId == 0) {
+            return repository.findAll(pageRequest);
+        }
+        return repository.findByUserId(userId, pageRequest);
+    }
+
+    // @Transactional(readOnly = true)
+    // public FavoriteEntity get(Long id) {
+    // return repository.findById(id).orElseThrow(() -> new NotFoundException(null,
+    // id));
+    // }
+
+    @Transactional(readOnly = true)
+    public FavoriteEntity get(long userId, long id) {
+        userService.get(userId);
+        return repository.findOneByUserIdAndId(userId, id)
+                .orElseThrow(() -> new NotFoundException(FavoriteEntity.class, id));
+    }
+
+    @Transactional()
+    public FavoriteEntity create(FavoriteEntity entity, Long userId) {
+        if (entity == null) {
+            throw new IllegalArgumentException("Entity is null");
+        }
+
+        entity.setUser(userService.get(userId));
+        return repository.save(entity);
+    }
+
+    @Transactional
+    public FavoriteEntity toggle(Long userId, Long bookId, boolean isFavourite) {
+        if (isFavourite)
+            return delete(userId, bookId);
+
+        return create(new FavoriteEntity(userService.get(userId), bookService.get(bookId)), userId);
+    }
+
+    @Transactional
+    public FavoriteEntity update(long userId, Long id, FavoriteEntity entity) {
+        final FavoriteEntity exisEntity = get(userId, id);
+        exisEntity.setUser(entity.getUser());
+        exisEntity.setBook(entity.getBook());
+        return repository.save(exisEntity);
+    }
+
+    @Transactional
+    public FavoriteEntity delete(long userId, Long id) {
+        final FavoriteEntity existEntity = get(userId, id);
+        repository.delete(existEntity);
+        return existEntity;
+    }
+}

lab45/src/main/java/com/example/demo/genres/api/GenreController.java

@@ -0,0 +1,104 @@
+package com.example.demo.genres.api;
+
+import org.modelmapper.ModelMapper;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.validation.BindingResult;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.ModelAttribute;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+import com.example.demo.core.configuration.Constants;
+import com.example.demo.genres.model.GenreEntity;
+import com.example.demo.genres.service.GenreService;
+
+import jakarta.validation.Valid;
+
+@Controller
+@RequestMapping(GenreController.URL)
+public class GenreController {
+    public static final String URL = Constants.ADMIN_PREFIX + "/genre";
+    private static final String GENRE_VIEW = "genre";
+    private static final String GENRE_EDIT_VIEW = "genre-edit";
+    private static final String GENRE_ATTRIBUTE = "genre";
+
+    private final GenreService genreService;
+    private final ModelMapper modelMapper;
+
+    public GenreController(GenreService genreService, ModelMapper modelMapper) {
+        this.genreService = genreService;
+        this.modelMapper = modelMapper;
+    }
+
+    private GenreDto toDto(GenreEntity entity) {
+        return modelMapper.map(entity, GenreDto.class);
+    }
+
+    private GenreEntity toEntity(GenreDto dto) {
+        return modelMapper.map(dto, GenreEntity.class);
+    }
+
+    @GetMapping
+    public String getAll(Model model) {
+        model.addAttribute(
+                "items",
+                genreService.getAll().stream()
+                        .map(this::toDto)
+                        .toList());
+        return GENRE_VIEW;
+    }
+
+    @GetMapping("/edit/")
+    public String create(Model model) {
+        model.addAttribute(GENRE_ATTRIBUTE, new GenreDto());
+        return GENRE_EDIT_VIEW;
+    }
+
+    @PostMapping("/edit/")
+    public String create(
+            @ModelAttribute(name = GENRE_ATTRIBUTE) @Valid GenreDto genre,
+            BindingResult bindingResult,
+            Model model) {
+        if (bindingResult.hasErrors()) {
+            return GENRE_EDIT_VIEW;
+        }
+        genreService.create(toEntity(genre));
+        return Constants.REDIRECT_VIEW + URL;
+    }
+
+    @GetMapping("/edit/{id}")
+    public String update(
+            @PathVariable(name = "id") Long id,
+            Model model) {
+        if (id <= 0) {
+            throw new IllegalArgumentException();
+        }
+        model.addAttribute(GENRE_ATTRIBUTE, toDto(genreService.get(id)));
+        return GENRE_EDIT_VIEW;
+    }
+
+    @PostMapping("/edit/{id}")
+    public String update(
+            @PathVariable(name = "id") Long id,
+            @ModelAttribute(name = GENRE_ATTRIBUTE) @Valid GenreDto genre,
+            BindingResult bindingResult,
+            Model model) {
+        if (bindingResult.hasErrors()) {
+            return GENRE_EDIT_VIEW;
+        }
+        if (id <= 0) {
+            throw new IllegalArgumentException();
+        }
+        genreService.update(id, toEntity(genre));
+        return Constants.REDIRECT_VIEW + URL;
+    }
+
+    @PostMapping("/delete/{id}")
+    public String delete(
+            @PathVariable(name = "id") Long id) {
+        genreService.delete(id);
+        return Constants.REDIRECT_VIEW + URL;
+    }
+}

lab45/src/main/java/com/example/demo/genres/api/GenreDto.java

@@ -0,0 +1,30 @@
+package com.example.demo.genres.api;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
+
+public class GenreDto {
+    @JsonProperty(access = JsonProperty.Access.READ_ONLY)
+    private Long id;
+    @NotBlank
+    @Size(min = 5, max = 50)
+    private String name;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}

lab45/src/main/java/com/example/demo/genres/model/GenreEntity.java

@@ -0,0 +1,53 @@
+package com.example.demo.genres.model;
+
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+
+import com.example.demo.books.model.BookEntity;
+import com.example.demo.core.model.BaseEntity;
+
+import jakarta.persistence.CascadeType;
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.OneToMany;
+import jakarta.persistence.Table;
+
+@Entity
+@Table(name = "genres")
+public class GenreEntity extends BaseEntity {
+    @Column(nullable = false, unique = true, length = 50)
+    private String name;
+    @OneToMany(mappedBy = "genre", cascade = CascadeType.ALL)
+    private Set<BookEntity> books = new HashSet<>();
+
+    public GenreEntity() {
+    }
+
+    public GenreEntity(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, name);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null || getClass() != obj.getClass())
+            return false;
+        final GenreEntity other = (GenreEntity) obj;
+        return Objects.equals(other.getId(), id) && Objects.equals(other.getName(), name);
+    }
+}

lab45/src/main/java/com/example/demo/genres/repository/GenreRepository.java

@@ -0,0 +1,11 @@
+package com.example.demo.genres.repository;
+
+import java.util.Optional;
+
+import org.springframework.data.repository.CrudRepository;
+
+import com.example.demo.genres.model.GenreEntity;
+
+public interface GenreRepository extends CrudRepository<GenreEntity, Long> {
+    Optional<GenreEntity> findByNameIgnoreCase(String name);
+}

lab45/src/main/java/com/example/demo/genres/service/GenreService.java

@@ -0,0 +1,62 @@
+package com.example.demo.genres.service;
+
+import java.util.List;
+import java.util.stream.StreamSupport;
+
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import com.example.demo.core.error.NotFoundException;
+import com.example.demo.genres.model.GenreEntity;
+import com.example.demo.genres.repository.GenreRepository;
+
+@Service
+public class GenreService {
+    private final GenreRepository repository;
+
+    public GenreService(GenreRepository repository) {
+        this.repository = repository;
+    }
+
+    private void checkName(String name) {
+        if (repository.findByNameIgnoreCase(name).isPresent()) {
+            throw new IllegalArgumentException(
+                    String.format("Genre with name %s is already exists", name));
+        }
+    }
+
+    @Transactional(readOnly = true)
+    public List<GenreEntity> getAll() {
+        return StreamSupport.stream(repository.findAll().spliterator(), false).toList();
+    }
+
+    @Transactional(readOnly = true)
+    public GenreEntity get(long id) {
+        return repository.findById(id)
+                .orElseThrow(() -> new NotFoundException(GenreEntity.class, id));
+    }
+
+    @Transactional
+    public GenreEntity create(GenreEntity entity) {
+        if (entity == null) {
+            throw new IllegalArgumentException("Entity is null");
+        }
+        checkName(entity.getName());
+        return repository.save(entity);
+    }
+
+    @Transactional
+    public GenreEntity update(Long id, GenreEntity entity) {
+        final GenreEntity existsEntity = get(id);
+        checkName(entity.getName());
+        existsEntity.setName(entity.getName());
+        return repository.save(existsEntity);
+    }
+
+    @Transactional
+    public GenreEntity delete(Long id) {
+        final GenreEntity existsEntity = get(id);
+        repository.delete(existsEntity);
+        return existsEntity;
+    }
+}

lab45/src/main/java/com/example/demo/users/api/UserController.java

@@ -0,0 +1,126 @@
+package com.example.demo.users.api;
+
+import java.util.Map;
+import org.modelmapper.ModelMapper;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.validation.BindingResult;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.ModelAttribute;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.servlet.mvc.support.RedirectAttributes;
+
+import com.example.demo.core.api.PageAttributesMapper;
+import com.example.demo.core.configuration.Constants;
+import com.example.demo.users.model.UserEntity;
+import com.example.demo.users.service.UserService;
+
+import jakarta.validation.Valid;
+
+@Controller
+@RequestMapping(UserController.URL)
+public class UserController {
+
+    public static final String URL = Constants.ADMIN_PREFIX + "/user";
+    private static final String USER_VIEW = "user";
+    private static final String USER_EDIT_VIEW = "user-edit";
+    private static final String PAGE_ATTRIBUTE = "page";
+    private static final String USER_ATTRIBUTE = "user";
+
+    private final UserService userService;
+    private final ModelMapper modelMapper;
+
+    public UserController(UserService userService, ModelMapper modelMapper) {
+        this.modelMapper = modelMapper;
+        this.userService = userService;
+    }
+
+    private UserEntity toEntity(UserDto dto) {
+        return modelMapper.map(dto, UserEntity.class);
+    }
+
+    private UserDto toDto(UserEntity entity) {
+        return modelMapper.map(entity, UserDto.class);
+    }
+
+    @GetMapping
+    public String getAll(
+            @RequestParam(name = PAGE_ATTRIBUTE, defaultValue = "0") int page,
+            Model model) {
+        final Map<String, Object> attributes = PageAttributesMapper.toAttributes(
+                userService.getAll(page, Constants.DEFUALT_PAGE_SIZE), this::toDto);
+        model.addAllAttributes(attributes);
+        model.addAttribute(PAGE_ATTRIBUTE, page);
+        return USER_VIEW;
+    }
+
+    @GetMapping("/edit/")
+    public String create(@RequestParam(name = PAGE_ATTRIBUTE, defaultValue = "0") int page,
+            Model model) {
+        model.addAttribute(USER_ATTRIBUTE, new UserDto());
+        model.addAttribute(PAGE_ATTRIBUTE, page);
+        return USER_EDIT_VIEW;
+    }
+
+    @PostMapping("/edit/")
+    public String create(
+            @RequestParam(name = PAGE_ATTRIBUTE, defaultValue = "0") int page,
+            @ModelAttribute(name = USER_ATTRIBUTE) @Valid UserDto user,
+            BindingResult bindingResult,
+            Model model,
+            RedirectAttributes redirectAttributes) {
+        if (bindingResult.hasErrors()) {
+            model.addAttribute(PAGE_ATTRIBUTE, page);
+            return USER_EDIT_VIEW;
+        }
+        redirectAttributes.addAttribute(PAGE_ATTRIBUTE, page);
+        userService.create(toEntity(user));
+        return Constants.REDIRECT_VIEW + URL;
+    }
+
+    @GetMapping("/edit/{id}")
+    public String update(
+            @PathVariable(name = "id") Integer id,
+            @RequestParam(name = PAGE_ATTRIBUTE, defaultValue = "0") int page,
+            Model model) {
+        if (id <= 0) {
+            throw new IllegalArgumentException();
+        }
+        model.addAttribute(USER_ATTRIBUTE, toDto(userService.get(id)));
+        model.addAttribute(PAGE_ATTRIBUTE, page);
+        return USER_EDIT_VIEW;
+    }
+
+    @PostMapping("/edit/{id}")
+    public String update(
+            @PathVariable(name = "id") Integer id,
+            @RequestParam(name = PAGE_ATTRIBUTE, defaultValue = "0") int page,
+            @ModelAttribute(name = USER_ATTRIBUTE) @Valid UserDto user,
+            BindingResult bindingResult,
+            Model model,
+            RedirectAttributes redirectAttributes) {
+        if (bindingResult.hasErrors()) {
+            model.addAttribute(PAGE_ATTRIBUTE, page);
+            return USER_EDIT_VIEW;
+        }
+        if (id <= 0) {
+            throw new IllegalArgumentException();
+        }
+        redirectAttributes.addAttribute(PAGE_ATTRIBUTE, page);
+        userService.update(id, toEntity(user));
+        return Constants.REDIRECT_VIEW + URL;
+    }
+
+    @PostMapping("/delete/{id}")
+    public String delete(
+            @PathVariable(name = "id") Integer id,
+            @RequestParam(name = PAGE_ATTRIBUTE, defaultValue = "0") int page,
+            RedirectAttributes redirectAttributes) {
+        redirectAttributes.addAttribute(PAGE_ATTRIBUTE, page);
+        userService.delete(id);
+        return Constants.REDIRECT_VIEW + URL;
+    }
+}