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Чтение продуктов для главного и дискаунт экранов из апишки. Великая победа над ремоут медиатором.

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This commit is contained in:
Данила Мочалов 2023-12-20 03:09:45 +04:00
parent f52b88e8b6
commit 5c2284ff79
9 changed files with 170 additions and 12 deletions
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2
app/src/main/java/com/example/shawarma/AppModule.kt
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@ -50,7 +50,7 @@ object AppModule {
@Provides
@Singleton
fun provideProductRepository(db: AppDatabase) : ProductRepository {
return ProductRepository(db.productDao(), db.orderProductDao())
return ProductRepository(database = db, db.productDao(), db.orderProductDao())
}
@Provides

13
app/src/main/java/com/example/shawarma/data/api/MyServerService.kt
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@ -1,5 +1,6 @@
package com.example.shawarma.data.api
import com.example.shawarma.data.api.models.ProductListResponse
import com.example.shawarma.data.api.models.TokenModelRemote
import com.example.shawarma.data.api.models.UserModelRemote
import com.jakewharton.retrofit2.converter.kotlinx.serialization.asConverterFactory
@ -8,7 +9,10 @@ import okhttp3.MediaType.Companion.toMediaType
import okhttp3.logging.HttpLoggingInterceptor
import retrofit2.Retrofit
import retrofit2.http.Body
import retrofit2.http.GET
import retrofit2.http.Header
import retrofit2.http.POST
import retrofit2.http.Path
interface MyServerService {
@ -27,6 +31,15 @@ interface MyServerService {
@Body user: UserModelRemote
) :UserModelRemote?
@GET("user/products/{after}")
suspend fun getProductsList(@Path("after") after: Int, @Header("Authorization") token: String) : ProductListResponse
@GET("user/discounts/{after}")
suspend fun getDiscountsList(@Path("after") after: Int, @Header("Authorization") token: String) : ProductListResponse
@GET("user/items/{after}")
suspend fun getItemsList(@Path("after") after: Int, @Header("Authorization") token: String) : ProductListResponse
companion object {
private const val BASE_URL = "https://10.0.2.2:80/api/"

91
app/src/main/java/com/example/shawarma/data/api/mediators/ProductRemoteMediator.kt Normal file
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@ -0,0 +1,91 @@
package com.example.shawarma.data.api.mediators
import androidx.paging.ExperimentalPagingApi
import androidx.paging.LoadType
import androidx.paging.PagingState
import androidx.paging.RemoteMediator
import androidx.room.withTransaction
import com.example.shawarma.data.api.MyServerService
import com.example.shawarma.data.api.models.ProductListResponse
import com.example.shawarma.data.api.models.toProductModel
import com.example.shawarma.data.db.AppDatabase
import com.example.shawarma.data.models.ProductModel
import java.io.IOException
@OptIn(ExperimentalPagingApi::class)
class ProductRemoteMediator (
private val database: AppDatabase,
private val serverService: MyServerService,
private val query: String,
private val token: String
) : RemoteMediator<Int, ProductModel>(){
private val productDao = database.productDao()
override suspend fun load(
loadType: LoadType,
state: PagingState<Int, ProductModel>
): MediatorResult {
return try {
// The network load method takes an optional `after=<user.id>` parameter. For every
// page after the first, we pass the last user ID to let it continue from where it
// left off. For REFRESH, pass `null` to load the first page.
var loadKey = when (loadType) {
LoadType.REFRESH -> null
// In this example, we never need to prepend, since REFRESH will always load the
// first page in the list. Immediately return, reporting end of pagination.
LoadType.PREPEND -> return MediatorResult.Success(endOfPaginationReached = true)
LoadType.APPEND -> {
val lastItem = state.lastItemOrNull()
?: return MediatorResult.Success(endOfPaginationReached = true)
// We must explicitly check if the last item is `null` when appending,
// since passing `null` to networkService is only valid for initial load.
// If lastItem is `null` it means no items were loaded after the initial
// REFRESH and there are no more items to load.
lastItem.id
}
}
// Suspending network load via Retrofit. This doesn't need to be wrapped in a
// withContext(Dispatcher.IO) { ... } block since Retrofit's Coroutine CallAdapter
// dispatches on a worker thread.
if (loadKey == null) {
loadKey = 0
}
val response: ProductListResponse = when (query) {
"home" -> {
serverService.getProductsList(after = loadKey, token = token)
}
"discounts" -> {
serverService.getDiscountsList(after = loadKey, token = token)
}
"items" -> {
serverService.getItemsList(after = loadKey, token = token)
}
else -> {ProductListResponse()}
}
database.withTransaction {
if (loadType == LoadType.REFRESH) {
productDao.deleteByQuery(query)
}
// Insert new users into database, which invalidates the current
// PagingData, allowing Paging to present the updates in the DB.
val products = mutableListOf<ProductModel>()
for (prod in response.products) {
products.add(prod.toProductModel())
}
productDao.insertAll(products)
}
MediatorResult.Success(endOfPaginationReached = response.nextKey == -1)
} catch (e: IOException) {
MediatorResult.Error(e)
}
}
}

12
app/src/main/java/com/example/shawarma/data/api/models/ProductModelRemote.kt
View File

@ -8,13 +8,19 @@ data class ProductModelRemote(
val id: Int = 0,
val title: String = "",
val price: Int = 0,
val oldPrice: Int? = null
val old_price: Int? = null
)
@Serializable
data class ProductListResponse(
val products: List<ProductModelRemote> = listOf(),
val nextKey: Int? = null
)
fun ProductModelRemote.toProductModel(): ProductModel = ProductModel(
id, title, price, oldPrice
id, title, price, old_price
)
fun ProductModel.toProductModelRemote(): ProductModelRemote = ProductModelRemote(
title = title, price = price, oldPrice = oldPrice
title = title, price = price, old_price = oldPrice
)

27
app/src/main/java/com/example/shawarma/data/interfaces/dao/ProductDao.kt
View File

@ -13,6 +13,12 @@ interface ProductDao {
@Insert
suspend fun insert(product: ProductModel)
suspend fun insertAll(products: List<ProductModel>) {
for (product in products) {
insert(product)
}
}
@Update
suspend fun update(product: ProductModel)
@ -39,4 +45,25 @@ interface ProductDao {
@Query("select * from products")
fun getPagedItems(): PagingSource<Int, ProductModel>
@Query("delete from products where products.product_old_price is null")
fun deleteAllProducts()
@Query("delete from products where products.product_old_price is not null")
fun deleteAllDiscountProducts()
@Query("delete from products")
fun deleteAllItems()
fun deleteByQuery(query: String) {
if (query == "home") {
deleteAllProducts()
}
if (query == "discounts") {
deleteAllDiscountProducts()
}
if (query == "items") {
deleteAllItems()
}
}
}

17
app/src/main/java/com/example/shawarma/data/repos/ProductRepository.kt
View File

@ -1,8 +1,12 @@
package com.example.shawarma.data.repos
import androidx.paging.ExperimentalPagingApi
import androidx.paging.Pager
import androidx.paging.PagingConfig
import androidx.paging.PagingData
import com.example.shawarma.data.api.MyServerService
import com.example.shawarma.data.api.mediators.ProductRemoteMediator
import com.example.shawarma.data.db.AppDatabase
import com.example.shawarma.data.interfaces.dao.OrderProductDao
import com.example.shawarma.data.interfaces.dao.ProductDao
import com.example.shawarma.data.models.ProductModel
@ -10,6 +14,7 @@ import kotlinx.coroutines.flow.Flow
import javax.inject.Inject
class ProductRepository @Inject constructor(
private val database: AppDatabase,
private val productDao: ProductDao,
private val orderProductDao: OrderProductDao
) {
@ -26,20 +31,24 @@ class ProductRepository @Inject constructor(
fun getById(id: Int): Flow<ProductModel> {
return productDao.getById(id)
}
fun getAllProductsPaged(): Flow<PagingData<ProductModel>> = Pager(
@OptIn(ExperimentalPagingApi::class)
fun getAllProductsPaged(token: String): Flow<PagingData<ProductModel>> = Pager(
config = PagingConfig(
pageSize = 6,
enablePlaceholders = false
),
pagingSourceFactory = productDao::getPaged
pagingSourceFactory = productDao::getPaged,
remoteMediator = ProductRemoteMediator(database = database, serverService = MyServerService.getInstance(), query = "home", token = token)
).flow
fun getAllDiscountsPaged(): Flow<PagingData<ProductModel>> = Pager(
@OptIn(ExperimentalPagingApi::class)
fun getAllDiscountsPaged(token: String): Flow<PagingData<ProductModel>> = Pager(
config = PagingConfig(
pageSize = 6,
enablePlaceholders = false
),
pagingSourceFactory = productDao::getPagedDiscounts
pagingSourceFactory = productDao::getPagedDiscounts,
remoteMediator = ProductRemoteMediator(database = database, serverService = MyServerService.getInstance(), query = "discounts", token = token)
).flow
fun getAllItemsPaged(): Flow<PagingData<ProductModel>> = Pager(

6
app/src/main/java/com/example/shawarma/screens/discount/DiscountScreen.kt
View File

@ -58,9 +58,13 @@ fun DiscountScreen() {
@Composable
fun DiscountList(){
val preferencesManager = PreferencesManager(LocalContext.current)
val searchToken = preferencesManager.getData("token", "")
val homeViewModel: HomeViewModel = hiltViewModel<HomeViewModel>()
val productsListUiState = homeViewModel.discountListUiState.collectAsLazyPagingItems()
val productsListUiState = homeViewModel.getDiscountList(searchToken).collectAsLazyPagingItems()
Box(
modifier = Modifier

6
app/src/main/java/com/example/shawarma/screens/home/HomeScreen.kt
View File

@ -57,9 +57,13 @@ fun HomeScreen() {
@Composable
fun HomeList(){
val preferencesManager = PreferencesManager(LocalContext.current)
val searchToken = preferencesManager.getData("token", "")
val homeViewModel: HomeViewModel = hiltViewModel<HomeViewModel>()
val productsListUiState = homeViewModel.productListUiState.collectAsLazyPagingItems()
val productsListUiState = homeViewModel.getProductList(searchToken).collectAsLazyPagingItems()
Box(

8
app/src/main/java/com/example/shawarma/viewmodels/HomeViewModel.kt
View File

@ -25,9 +25,13 @@ class HomeViewModel @Inject constructor(
private val orderProductRepository: OrderProductRepository
) : ViewModel() {
val productListUiState: Flow<PagingData<ProductModel>> = productRepository.getAllProductsPaged()
fun getProductList(token:String): Flow<PagingData<ProductModel>> {
return productRepository.getAllProductsPaged(token)
}
val discountListUiState: Flow<PagingData<ProductModel>> = productRepository.getAllDiscountsPaged()
fun getDiscountList(token: String): Flow<PagingData<ProductModel>> {
return productRepository.getAllDiscountsPaged(token)
}
fun addProductToCart(productId: Int, userId: String) {