Lab_4

tasks/nikiforova-ts/Lab_4/.gitignore

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tasks/nikiforova-ts/Lab_4/DApp/Consumer#1/Consumer#1.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>Consumer_1</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="RabbitMQ.Client" Version="6.8.1" />
+  </ItemGroup>
+
+</Project>

tasks/nikiforova-ts/Lab_4/DApp/Consumer#1/Program.cs

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+using System.Text;
+using RabbitMQ.Client;
+
+var фабрика = new ConnectionFactory { HostName = "localhost" };
+using var подключение = фабрика.CreateConnection();
+using var канал = подключение.CreateModel();
+
+канал.ExchangeDeclare(exchange: "job", type: ExchangeType.Fanout);
+Random rand = new Random();
+foreach (var элемент in Enumerable.Range(0, 1000))
+{
+    var сообщение = rand.Next().ToString();
+
+    var тело = Encoding.UTF8.GetBytes(сообщение);
+    канал.BasicPublish(exchange: "job",
+            routingKey: string.Empty,
+            basicProperties: null,
+            body: тело);
+
+    Console.WriteLine($" [x] Поступила заявка {сообщение}");
+    await Task.Delay(500);
+}
+
+Console.WriteLine(" Нажмите [Enter] для выхода.");
+Console.ReadLine();
+
+static string ПолучитьСообщение(string[] аргументы)
+{
+    return ((аргументы.Length > 0) ? string.Join(" ", аргументы) : "info: Принято!");
+}

tasks/nikiforova-ts/Lab_4/DApp/Consumer#2/Consumer#2.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>Consumer_2</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="RabbitMQ.Client" Version="6.8.1" />
+  </ItemGroup>
+
+</Project>

tasks/nikiforova-ts/Lab_4/DApp/Consumer#2/Program.cs

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+using System.Text;
+using RabbitMQ.Client;
+using RabbitMQ.Client.Events;
+
+var фабрика = new ConnectionFactory { HostName = "localhost" };
+using var подключение = фабрика.CreateConnection();
+using var канал = подключение.CreateModel();
+
+канал.QueueDeclare(queue: "принятые");
+канал.QueueBind(queue: "принятые",
+    exchange: "job",
+    routingKey: string.Empty);
+
+Console.WriteLine(" [*] Ожидание сообщений.");
+
+var потребительПринятых = new EventingBasicConsumer(канал);
+потребительПринятых.Received += async (model, ea) =>
+{
+    byte[] тело = ea.Body.ToArray();
+    var сообщение = Encoding.UTF8.GetString(тело);
+
+    string вывод = $"Заявка принята {сообщение} на исполнение";
+    Console.WriteLine($" [x] Готово. {вывод}");
+    канал.BasicAck(deliveryTag: ea.DeliveryTag, multiple: false);
+};
+канал.BasicConsume(queue: "принятые",
+    autoAck: false,
+    consumer: потребительПринятых);
+
+Console.WriteLine(" Нажмите [Enter] для выхода.");
+Console.ReadLine();

tasks/nikiforova-ts/Lab_4/DApp/Publisher/Program.cs

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+using System;
+using RabbitMQ.Client;
+using RabbitMQ.Client.Events;
+using System.Text;
+
+var фабрика = new ConnectionFactory { HostName = "localhost" };
+using var подключение = фабрика.CreateConnection();
+using var канал = подключение.CreateModel();
+
+Random rand = new Random();
+string имяОчередиОтклоненных = $"отклоненные{rand.Next()}";
+
+канал.QueueDeclare(queue: имяОчередиОтклоненных);
+канал.QueueBind(queue: имяОчередиОтклоненных,
+    exchange: "job",
+    routingKey: string.Empty);
+
+Console.WriteLine(" [*] Ожидание сообщений.");
+
+var потребитель = new EventingBasicConsumer(канал);
+потребитель.Received += async (model, ea) =>
+{
+    byte[] тело = ea.Body.ToArray();
+    var сообщение = Encoding.UTF8.GetString(тело);
+
+    int времяОжидания = rand.Next(20, 90);
+    Thread.Sleep(времяОжидания * 100);
+
+    string вывод = $"Заявка отложена {сообщение} на {времяОжидания} минут";
+    Console.WriteLine($" [x] Готово. {вывод}");
+    канал.BasicAck(deliveryTag: ea.DeliveryTag, multiple: false);
+};
+канал.BasicConsume(queue: имяОчередиОтклоненных,
+    autoAck: false,
+    consumer: потребитель);
+
+Console.WriteLine(" Нажмите [Enter] для выхода.");
+Console.ReadLine();

tasks/nikiforova-ts/Lab_4/DApp/Publisher/Publisher.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="RabbitMQ.Client" Version="6.8.1" />
+  </ItemGroup>
+
+</Project>

tasks/nikiforova-ts/Lab_4/README.md

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+# Отчёт по лабораторной работе №4
+
+Выполнила: студентка гр. ИСЭбд-41 Никифорова Татьяна Сергеевна.
+
+## Установка брокера сообщений RabbitMQ
+Установлен RabbitMQ. Выполнен вход на http://localhost:15672/ в качестве гостя:
+
+![](picture/1.png) 
+![](picture/3.png) 
+
+## Прохождение tutorial
+
+Tutorial№1
+![](picture/5.png) 
+![](picture/4.png) 
+
+Tutorial№2
+![](picture/6.png) 
+![](picture/7.png) 
+![](picture/8.png) 
+
+Tutorial№3
+![](picture/9.png) 
+![](picture/10.png) 
+
+## Разработка демонстрационных приложений
+
+Предметная область - процесс подачи заявок на работу и отбор кандидатов. Заявитель является производителем, а команды HR и система обработки заявок - потребителями. 
+
+1. Publisher:
+```
+using System;
+using RabbitMQ.Client;
+using RabbitMQ.Client.Events;
+using System.Text;
+
+var фабрика = new ConnectionFactory { HostName = "localhost" };
+using var подключение = фабрика.CreateConnection();
+using var канал = подключение.CreateModel();
+
+Random rand = new Random();
+string имяОчередиОтклоненных = $"отклоненные{rand.Next()}";
+
+канал.QueueDeclare(queue: имяОчередиОтклоненных);
+канал.QueueBind(queue: имяОчередиОтклоненных,
+    exchange: "job",
+    routingKey: string.Empty);
+
+Console.WriteLine(" [*] Ожидание сообщений.");
+
+var потребитель = new EventingBasicConsumer(канал);
+потребитель.Received += async (model, ea) =>
+{
+    byte[] тело = ea.Body.ToArray();
+    var сообщение = Encoding.UTF8.GetString(тело);
+
+    int времяОжидания = rand.Next(20, 90);
+    Thread.Sleep(времяОжидания * 100);
+
+    string вывод = $"Заявка отложена {сообщение} на {времяОжидания} минут";
+    Console.WriteLine($" [x] Готово. {вывод}");
+    канал.BasicAck(deliveryTag: ea.DeliveryTag, multiple: false);
+};
+канал.BasicConsume(queue: имяОчередиОтклоненных,
+    autoAck: false,
+    consumer: потребитель);
+
+Console.WriteLine(" Нажмите [Enter] для выхода.");
+Console.ReadLine();
+```
+2. Consumer 1:
+```
+using System.Text;
+using RabbitMQ.Client;
+
+var фабрика = new ConnectionFactory { HostName = "localhost" };
+using var подключение = фабрика.CreateConnection();
+using var канал = подключение.CreateModel();
+
+канал.ExchangeDeclare(exchange: "job", type: ExchangeType.Fanout);
+Random rand = new Random();
+foreach (var элемент in Enumerable.Range(0, 1000))
+{
+    var сообщение = rand.Next().ToString();
+
+    var тело = Encoding.UTF8.GetBytes(сообщение);
+    канал.BasicPublish(exchange: "job",
+            routingKey: string.Empty,
+            basicProperties: null,
+            body: тело);
+
+    Console.WriteLine($" [x] Поступила заявка {сообщение}");
+    await Task.Delay(500);
+}
+
+Console.WriteLine(" Нажмите [Enter] для выхода.");
+Console.ReadLine();
+
+static string ПолучитьСообщение(string[] аргументы)
+{
+    return ((аргументы.Length > 0) ? string.Join(" ", аргументы) : "info: Принято!");
+}
+```
+
+3. Consumer 3:
+```
+using System.Text;
+using RabbitMQ.Client;
+using RabbitMQ.Client.Events;
+
+var фабрика = new ConnectionFactory { HostName = "localhost" };
+using var подключение = фабрика.CreateConnection();
+using var канал = подключение.CreateModel();
+
+канал.QueueDeclare(queue: "принятые");
+канал.QueueBind(queue: "принятые",
+    exchange: "job",
+    routingKey: string.Empty);
+
+Console.WriteLine(" [*] Ожидание сообщений.");
+
+var потребительПринятых = new EventingBasicConsumer(канал);
+потребительПринятых.Received += async (model, ea) =>
+{
+    byte[] тело = ea.Body.ToArray();
+    var сообщение = Encoding.UTF8.GetString(тело);
+
+    string вывод = $"Заявка принята {сообщение} на исполнение";
+    Console.WriteLine($" [x] Готово. {вывод}");
+    канал.BasicAck(deliveryTag: ea.DeliveryTag, multiple: false);
+};
+канал.BasicConsume(queue: "принятые",
+    autoAck: false,
+    consumer: потребительПринятых);
+
+Console.WriteLine(" Нажмите [Enter] для выхода.");
+Console.ReadLine();
+```
+
+## Результаты выполнения работ
+
+Запуск программы :
+
+![](picture/12.png)
+![](picture/13.png)
+![](picture/14.png) 
+
+Результаты обработки:
+![](picture/11.png)
+![](picture/15.png) 
+
+Вывод: Ситуация с выполнением задач в очереди первого потребителя (Consumer#1) не изменилась, однако экземпляры второго потребителя (Consumer#2) теперь требуют в два раза больше времени и ресурсов, а их очереди по-прежнему перегружены.

tasks/nikiforova-ts/Lab_4/Tutorial№1/Receive/Receive.cs

@@ -0,0 +1,30 @@
+using System.Text;
+using RabbitMQ.Client;
+using RabbitMQ.Client.Events;
+
+var factory = new ConnectionFactory { HostName = "localhost" };
+using var connection = factory.CreateConnection();
+using var channel = connection.CreateModel();
+
+channel.QueueDeclare(queue: "hello",
+                     durable: false,
+                     exclusive: false,
+                     autoDelete: false,
+                     arguments: null);
+
+Console.WriteLine(" [*] Waiting for messages.");
+
+var consumer = new EventingBasicConsumer(channel);
+consumer.Received += (model, ea) =>
+{
+    
+    var body = ea.Body.ToArray();
+    var message = Encoding.UTF8.GetString(body);
+    Console.WriteLine($" [x] Received {message}");
+};
+channel.BasicConsume(queue: "hello",
+                     autoAck: true,
+                     consumer: consumer);
+
+Console.WriteLine(" Press [enter] to exit.");
+Console.ReadLine();                     

tasks/nikiforova-ts/Lab_4/Tutorial№1/Receive/Receive.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="RabbitMQ.Client" Version="6.8.1" />
+  </ItemGroup>
+
+</Project>

tasks/nikiforova-ts/Lab_4/Tutorial№1/Send/Send.cs

@@ -0,0 +1,24 @@
+using System.Text;
+using RabbitMQ.Client;
+
+var factory = new ConnectionFactory { HostName = "localhost" };
+using var connection = factory.CreateConnection();
+using var channel = connection.CreateModel();
+
+channel.QueueDeclare(queue: "hello",
+                     durable: false,
+                     exclusive: false,
+                     autoDelete: false,
+                     arguments: null);
+
+const string message = "Hello World! Tutorial№1!";
+var body = Encoding.UTF8.GetBytes(message);
+
+channel.BasicPublish(exchange: string.Empty,
+                     routingKey: "hello",
+                     basicProperties: null,
+                     body: body);
+Console.WriteLine($" [x] Sent {message}");
+
+Console.WriteLine(" Press [enter] to exit.");
+Console.ReadLine();

tasks/nikiforova-ts/Lab_4/Tutorial№1/Send/Send.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="RabbitMQ.Client" Version="6.8.1" />
+  </ItemGroup>
+
+</Project>

tasks/nikiforova-ts/Lab_4/Tutorial№2/NewTask/NewTask.cs

@@ -0,0 +1,32 @@
+using System.Text;
+using RabbitMQ.Client;
+
+var factory = new ConnectionFactory { HostName = "localhost" };
+using var connection = factory.CreateConnection();
+using var channel = connection.CreateModel();
+
+channel.QueueDeclare(queue: "task_queue",
+                     durable: true,
+                     exclusive: false,
+                     autoDelete: false,
+                     arguments: null);
+
+var message = GetMessage(args);
+var body = Encoding.UTF8.GetBytes(message);
+
+var properties = channel.CreateBasicProperties();
+properties.Persistent = true;
+
+channel.BasicPublish(exchange: string.Empty,
+                     routingKey: "task_queue",
+                     basicProperties: properties,
+                     body: body);
+Console.WriteLine($" [x] Sent {message}");
+
+Console.WriteLine(" Press [enter] to exit.");
+Console.ReadLine();
+
+static string GetMessage(string[] args)
+{
+    return ((args.Length > 0) ? string.Join(" ", args) : "Tutorial№2");
+}

tasks/nikiforova-ts/Lab_4/Tutorial№2/NewTask/NewTask.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="RabbitMQ.Client" Version="6.8.1" />
+  </ItemGroup>
+
+</Project>

tasks/nikiforova-ts/Lab_4/Tutorial№2/Worker/Worker.cs

@@ -0,0 +1,39 @@
+using System.Text;
+using RabbitMQ.Client;
+using RabbitMQ.Client.Events;
+
+var factory = new ConnectionFactory { HostName = "localhost" };
+using var connection = factory.CreateConnection();
+using var channel = connection.CreateModel();
+
+channel.QueueDeclare(queue: "task_queue",
+                     durable: true,
+                     exclusive: false,
+                     autoDelete: false,
+                     arguments: null);
+
+channel.BasicQos(prefetchSize: 0, prefetchCount: 1, global: false);
+
+Console.WriteLine(" [*] Waiting for messages.");
+
+var consumer = new EventingBasicConsumer(channel);
+consumer.Received += (model, ea) =>
+{
+    byte[] body = ea.Body.ToArray();
+    var message = Encoding.UTF8.GetString(body);
+    Console.WriteLine($" [x] Received {message}");
+
+    int dots = message.Split('.').Length - 1;
+    Thread.Sleep(dots * 1000);
+
+    Console.WriteLine(" [x] Done");
+
+    // here channel could also be accessed as ((EventingBasicConsumer)sender).Model
+    channel.BasicAck(deliveryTag: ea.DeliveryTag, multiple: false);
+};
+channel.BasicConsume(queue: "task_queue",
+                     autoAck: false,
+                     consumer: consumer);
+
+Console.WriteLine(" Press [enter] to exit.");
+Console.ReadLine();

tasks/nikiforova-ts/Lab_4/Tutorial№2/Worker/Worker.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="RabbitMQ.Client" Version="6.8.1" />
+  </ItemGroup>
+
+</Project>

tasks/nikiforova-ts/Lab_4/Tutorial№3/EmitLog/EmitLog.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="RabbitMQ.Client" Version="6.8.1" />
+  </ItemGroup>
+
+</Project>

tasks/nikiforova-ts/Lab_4/Tutorial№3/EmitLog/Program.cs

@@ -0,0 +1,24 @@
+using System.Text;
+using RabbitMQ.Client;
+
+var factory = new ConnectionFactory { HostName = "localhost" };
+using var connection = factory.CreateConnection();
+using var channel = connection.CreateModel();
+
+channel.ExchangeDeclare(exchange: "logs", type: ExchangeType.Fanout);
+
+var message = GetMessage(args);
+var body = Encoding.UTF8.GetBytes(message);
+channel.BasicPublish(exchange: "logs",
+                     routingKey: string.Empty,
+                     basicProperties: null,
+                     body: body);
+Console.WriteLine($" [x] Sent {message}");
+
+Console.WriteLine(" Press [enter] to exit.");
+Console.ReadLine();
+
+static string GetMessage(string[] args)
+{
+    return ((args.Length > 0) ? string.Join(" ", args) : "Tutorial№3");
+}

tasks/nikiforova-ts/Lab_4/Tutorial№3/ReceiveLogs/Program.cs

@@ -0,0 +1,31 @@
+using System.Text;
+using RabbitMQ.Client;
+using RabbitMQ.Client.Events;
+
+var factory = new ConnectionFactory { HostName = "localhost" };
+using var connection = factory.CreateConnection();
+using var channel = connection.CreateModel();
+
+channel.ExchangeDeclare(exchange: "logs", type: ExchangeType.Fanout);
+
+// declare a server-named queue
+var queueName = channel.QueueDeclare().QueueName;
+channel.QueueBind(queue: queueName,
+                  exchange: "logs",
+                  routingKey: string.Empty);
+
+Console.WriteLine(" [*] Waiting for logs.");
+
+var consumer = new EventingBasicConsumer(channel);
+consumer.Received += (model, ea) =>
+{
+    byte[] body = ea.Body.ToArray();
+    var message = Encoding.UTF8.GetString(body);
+    Console.WriteLine($" [x] {message}");
+};
+channel.BasicConsume(queue: queueName,
+                     autoAck: true,
+                     consumer: consumer);
+
+Console.WriteLine(" Press [enter] to exit.");
+Console.ReadLine();

tasks/nikiforova-ts/Lab_4/Tutorial№3/ReceiveLogs/ReceiveLogs.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="RabbitMQ.Client" Version="6.8.1" />
+  </ItemGroup>
+
+</Project>