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PodcastsRepository.kt
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PodcastsRepository.kt
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/*
* Copyright 2020 The Android Open Source Project
*
* 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.
*/
package com.example.jetcaster.data
import com.example.jetcaster.data.room.TransactionRunner
import kotlinx.coroutines.CoroutineDispatcher
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Job
import kotlinx.coroutines.flow.collect
import kotlinx.coroutines.flow.filter
import kotlinx.coroutines.flow.map
import kotlinx.coroutines.launch
/**
* Data repository for Podcasts.
*/
class PodcastsRepository(
private val podcastsFetcher: PodcastsFetcher,
private val podcastStore: PodcastStore,
private val episodeStore: EpisodeStore,
private val categoryStore: CategoryStore,
private val transactionRunner: TransactionRunner,
mainDispatcher: CoroutineDispatcher
) {
private var refreshingJob: Job? = null
private val scope = CoroutineScope(mainDispatcher)
suspend fun updatePodcasts(force: Boolean) {
if (refreshingJob?.isActive == true) {
refreshingJob?.join()
} else if (force || podcastStore.isEmpty()) {
refreshingJob = scope.launch {
// Now fetch the podcasts, and add each to each store
podcastsFetcher(SampleFeeds)
.filter { it is PodcastRssResponse.Success }
.map { it as PodcastRssResponse.Success }
.collect { (podcast, episodes, categories) ->
transactionRunner {
podcastStore.addPodcast(podcast)
episodeStore.addEpisodes(episodes)
categories.forEach { category ->
// First insert the category
val categoryId = categoryStore.addCategory(category)
// Now we can add the podcast to the category
categoryStore.addPodcastToCategory(
podcastUri = podcast.uri,
categoryId = categoryId
)
}
}
}
}
}
}
}