This moves the responsibility for joining the UserData and the NewsResources to UserNewsResourceRepository. This way, the work can be done once and shared with all consumers in a SharedFlow, rather than having each consumer perform the join itself by invoking the UseCase.pull/595/head
James Rose
2 years ago
parent
9ee2acf327
commit
bd450099fb
@ -1,58 +0,0 @@
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/*
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* Copyright 2022 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.samples.apps.nowinandroid.core.domain
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import com.google.samples.apps.nowinandroid.core.data.repository.NewsRepository
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import com.google.samples.apps.nowinandroid.core.data.repository.NewsResourceQuery
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import com.google.samples.apps.nowinandroid.core.data.repository.UserDataRepository
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import com.google.samples.apps.nowinandroid.core.domain.model.UserNewsResource
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import com.google.samples.apps.nowinandroid.core.domain.model.mapToUserNewsResources
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import com.google.samples.apps.nowinandroid.core.model.data.NewsResource
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import com.google.samples.apps.nowinandroid.core.model.data.UserData
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import kotlinx.coroutines.flow.Flow
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import kotlinx.coroutines.flow.combine
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import kotlinx.coroutines.flow.filterNot
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import javax.inject.Inject
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/**
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* A use case responsible for obtaining news resources with their associated bookmarked (also known
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* as "saved") state.
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*/
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class GetUserNewsResourcesUseCase @Inject constructor(
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private val newsRepository: NewsRepository,
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private val userDataRepository: UserDataRepository,
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) {
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/**
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* Returns a list of UserNewsResources which match the supplied set of topic ids.
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*
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* @param query - Summary of query parameters for news resources.
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*/
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operator fun invoke(
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query: NewsResourceQuery = NewsResourceQuery(),
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): Flow<List<UserNewsResource>> =
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newsRepository.getNewsResources(
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query = query,
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).mapToUserNewsResources(userDataRepository.userData)
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}
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private fun Flow<List<NewsResource>>.mapToUserNewsResources(
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userDataStream: Flow<UserData>,
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): Flow<List<UserNewsResource>> =
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filterNot { it.isEmpty() }
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.combine(userDataStream) { newsResources, userData ->
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newsResources.mapToUserNewsResources(userData)
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}
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@ -0,0 +1,42 @@
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/*
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* Copyright 2023 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.samples.apps.nowinandroid.core.domain.di
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import dagger.Module
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import dagger.Provides
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import dagger.hilt.InstallIn
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import dagger.hilt.components.SingletonComponent
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import kotlinx.coroutines.CoroutineScope
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import kotlinx.coroutines.Dispatchers
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import kotlinx.coroutines.SupervisorJob
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import javax.inject.Qualifier
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import javax.inject.Singleton
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@Retention(AnnotationRetention.RUNTIME)
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@Qualifier
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annotation class ApplicationScope
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@InstallIn(SingletonComponent::class)
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@Module
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object CoroutinesScopesModule {
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@Singleton
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@ApplicationScope
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@Provides
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fun providesCoroutineScope(): CoroutineScope =
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CoroutineScope(SupervisorJob() + Dispatchers.Default)
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}
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@ -0,0 +1,33 @@
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/*
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* Copyright 2023 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.samples.apps.nowinandroid.core.domain.di
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import com.google.samples.apps.nowinandroid.core.domain.repository.CompositeUserNewsResourceRepository
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import com.google.samples.apps.nowinandroid.core.domain.repository.UserNewsResourceRepository
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import dagger.Binds
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import dagger.Module
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import dagger.hilt.InstallIn
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import dagger.hilt.components.SingletonComponent
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@Module
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@InstallIn(SingletonComponent::class)
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interface UserNewsResourceRepositoryModule {
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@Binds
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fun bindsUserNewsResourceRepository(
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userDataRepository: CompositeUserNewsResourceRepository,
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): UserNewsResourceRepository
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}
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@ -0,0 +1,74 @@
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/*
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* Copyright 2023 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.samples.apps.nowinandroid.core.domain.repository
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import com.google.samples.apps.nowinandroid.core.data.repository.NewsRepository
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import com.google.samples.apps.nowinandroid.core.data.repository.NewsResourceQuery
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import com.google.samples.apps.nowinandroid.core.data.repository.UserDataRepository
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import com.google.samples.apps.nowinandroid.core.domain.di.ApplicationScope
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import com.google.samples.apps.nowinandroid.core.domain.model.UserNewsResource
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import com.google.samples.apps.nowinandroid.core.domain.model.mapToUserNewsResources
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import com.google.samples.apps.nowinandroid.core.model.data.NewsResource
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import com.google.samples.apps.nowinandroid.core.model.data.UserData
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import kotlinx.coroutines.CoroutineScope
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import kotlinx.coroutines.flow.Flow
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import kotlinx.coroutines.flow.SharingStarted.Companion.WhileSubscribed
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import kotlinx.coroutines.flow.combine
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import kotlinx.coroutines.flow.filterNot
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import kotlinx.coroutines.flow.flatMapLatest
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import kotlinx.coroutines.flow.map
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import kotlinx.coroutines.flow.shareIn
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import javax.inject.Inject
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/**
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* Implements a [UserNewsResourceRepository] by combining a [NewsRepository] with a
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* [UserDataRepository].
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*/
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class CompositeUserNewsResourceRepository @Inject constructor(
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@ApplicationScope private val coroutineScope: CoroutineScope,
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val newsRepository: NewsRepository,
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val userDataRepository: UserDataRepository,
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) : UserNewsResourceRepository {
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private val userNewsResources =
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newsRepository.getNewsResources().mapToUserNewsResources(userDataRepository.userData)
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.shareIn(coroutineScope, started = WhileSubscribed(5000), replay = 1)
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override fun getUserNewsResources(
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query: NewsResourceQuery,
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): Flow<List<UserNewsResource>> =
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userNewsResources.map { resources ->
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resources.filter { resource ->
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query.filterTopicIds?.let { topics -> resource.hasTopic(topics) } ?: true &&
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query.filterNewsIds?.contains(resource.id) ?: true
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}
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}
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override fun getUserNewsResourcesForFollowedTopics(): Flow<List<UserNewsResource>> =
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userDataRepository.userData.flatMapLatest { getUserNewsResources(NewsResourceQuery(filterTopicIds = it.followedTopics)) }
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private fun UserNewsResource.hasTopic(filterTopicIds: Set<String>) =
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followableTopics.any { filterTopicIds.contains(it.topic.id) }
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}
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private fun Flow<List<NewsResource>>.mapToUserNewsResources(
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userDataStream: Flow<UserData>,
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): Flow<List<UserNewsResource>> =
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filterNot { it.isEmpty() }
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.combine(userDataStream) { newsResources, userData ->
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newsResources.mapToUserNewsResources(userData)
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}
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@ -0,0 +1,41 @@
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/*
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* Copyright 2023 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.samples.apps.nowinandroid.core.domain.repository
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import com.google.samples.apps.nowinandroid.core.data.repository.NewsResourceQuery
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import com.google.samples.apps.nowinandroid.core.domain.model.UserNewsResource
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import kotlinx.coroutines.flow.Flow
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/**
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* Data layer implementation for [UserNewsResource]
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*/
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interface UserNewsResourceRepository {
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/**
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* Returns available news resources as a stream.
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*/
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fun getUserNewsResources(
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query: NewsResourceQuery = NewsResourceQuery(
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filterTopicIds = null,
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filterNewsIds = null,
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),
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): Flow<List<UserNewsResource>>
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/**
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* Returns available news resources for the user's followed topics as a stream.
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*/
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fun getUserNewsResourcesForFollowedTopics(): Flow<List<UserNewsResource>>
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}
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