Clean up download state logic in MorePresenter

app/src/main/java/eu/kanade/tachiyomi/data/download/DownloadService.kt

@@ -8,11 +8,9 @@ import android.os.IBinder
 import android.os.PowerManager
 import androidx.annotation.StringRes
 import androidx.core.content.ContextCompat
-import com.jakewharton.rxrelay.BehaviorRelay
 import eu.kanade.domain.download.service.DownloadPreferences
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.notification.Notifications
-import eu.kanade.tachiyomi.util.lang.plusAssign
 import eu.kanade.tachiyomi.util.lang.withUIContext
 import eu.kanade.tachiyomi.util.system.acquireWakeLock
 import eu.kanade.tachiyomi.util.system.isConnectedToWifi
@@ -32,7 +30,6 @@ import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.onEach
 import logcat.LogPriority
 import ru.beryukhov.reactivenetwork.ReactiveNetwork
-import rx.subscriptions.CompositeSubscription
 import uy.kohesive.injekt.injectLazy
 
 /**
@@ -44,11 +41,6 @@ class DownloadService : Service() {
 
     companion object {
 
-        /**
-         * Relay used to know when the service is running.
-         */
-        val runningRelay: BehaviorRelay<Boolean> = BehaviorRelay.create(false)
-
         private val _isRunning = MutableStateFlow(false)
         val isRunning = _isRunning.asStateFlow()
 
@@ -83,7 +75,6 @@ class DownloadService : Service() {
     }
 
     private val downloadManager: DownloadManager by injectLazy()
-
     private val downloadPreferences: DownloadPreferences by injectLazy()
 
     /**
@@ -91,62 +82,58 @@ class DownloadService : Service() {
      */
     private lateinit var wakeLock: PowerManager.WakeLock
 
-    private lateinit var subscriptions: CompositeSubscription
     private lateinit var ioScope: CoroutineScope
 
-    /**
-     * Called when the service is created.
-     */
     override fun onCreate() {
         super.onCreate()
         ioScope = CoroutineScope(SupervisorJob() + Dispatchers.IO)
         startForeground(Notifications.ID_DOWNLOAD_CHAPTER_PROGRESS, getPlaceholderNotification())
         wakeLock = acquireWakeLock(javaClass.name)
-        runningRelay.call(true)
         _isRunning.value = true
-        subscriptions = CompositeSubscription()
         listenDownloaderState()
         listenNetworkChanges()
     }
 
-    /**
-     * Called when the service is destroyed.
-     */
     override fun onDestroy() {
         ioScope?.cancel()
-        runningRelay.call(false)
         _isRunning.value = false
-        subscriptions.unsubscribe()
         downloadManager.stopDownloads()
         wakeLock.releaseIfNeeded()
         super.onDestroy()
     }
 
-    /**
-     * Not used.
-     */
+    // Not used
     override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
         return START_NOT_STICKY
     }
 
-    /**
-     * Not used.
-     */
+    // Not used
     override fun onBind(intent: Intent): IBinder? {
         return null
     }
 
+    private fun stopDownloads(@StringRes string: Int) {
+        downloadManager.stopDownloads(getString(string))
+    }
+
     /**
      * Listens to network changes.
-     *
-     * @see onNetworkStateChanged
      */
     private fun listenNetworkChanges() {
         ReactiveNetwork()
             .observeNetworkConnectivity(applicationContext)
             .onEach {
                 withUIContext {
-                    onNetworkStateChanged()
+                    if (isOnline()) {
+                        if (downloadPreferences.downloadOnlyOverWifi().get() && !isConnectedToWifi()) {
+                            stopDownloads(R.string.download_notifier_text_only_wifi)
+                        } else {
+                            val started = downloadManager.startDownloads()
+                            if (!started) stopSelf()
+                        }
+                    } else {
+                        stopDownloads(R.string.download_notifier_no_network)
+                    }
                 }
             }
             .catch { error ->
@@ -159,41 +146,20 @@ class DownloadService : Service() {
             .launchIn(ioScope)
     }
 
-    /**
-     * Called when the network state changes.
-     */
-    private fun onNetworkStateChanged() {
-        if (isOnline()) {
-            if (downloadPreferences.downloadOnlyOverWifi().get() && !isConnectedToWifi()) {
-                stopDownloads(R.string.download_notifier_text_only_wifi)
-            } else {
-                val started = downloadManager.startDownloads()
-                if (!started) stopSelf()
-            }
-        } else {
-            stopDownloads(R.string.download_notifier_no_network)
-        }
-    }
-
-    private fun stopDownloads(@StringRes string: Int) {
-        downloadManager.stopDownloads(getString(string))
-    }
-
     /**
      * Listens to downloader status. Enables or disables the wake lock depending on the status.
      */
     private fun listenDownloaderState() {
-        subscriptions += downloadManager.runningRelay
-            .doOnError {
-                /* Swallow wakelock error */
-            }
-            .subscribe { running ->
-                if (running) {
+        _isRunning
+            .onEach { isRunning ->
+                if (isRunning) {
                     wakeLock.acquireIfNeeded()
                 } else {
                     wakeLock.releaseIfNeeded()
                 }
             }
+            .catch { /* Ignore errors */ }
+            .launchIn(ioScope)
     }
 
     /**

app/src/main/java/eu/kanade/tachiyomi/data/download/model/DownloadQueue.kt

@@ -75,13 +75,14 @@ class DownloadQueue(
         Observable.from(this).filter { download -> download.status == Download.State.DOWNLOADING }
 
     @Deprecated("Use getStatusAsFlow instead")
-    fun getStatusObservable(): Observable<Download> = statusSubject
+    private fun getStatusObservable(): Observable<Download> = statusSubject
         .startWith(getActiveDownloads())
         .onBackpressureBuffer()
 
     fun getStatusAsFlow(): Flow<Download> = getStatusObservable().asFlow()
 
-    fun getUpdatedObservable(): Observable<List<Download>> = updatedRelay.onBackpressureBuffer()
+    @Deprecated("Use getUpdatedAsFlow instead")
+    private fun getUpdatedObservable(): Observable<List<Download>> = updatedRelay.onBackpressureBuffer()
         .startWith(Unit)
         .map { this }
 
@@ -94,7 +95,7 @@ class DownloadQueue(
     }
 
     @Deprecated("Use getProgressAsFlow instead")
-    fun getProgressObservable(): Observable<Download> {
+    private fun getProgressObservable(): Observable<Download> {
         return statusSubject.onBackpressureBuffer()
             .startWith(getActiveDownloads())
             .flatMap { download ->
@@ -113,9 +114,7 @@ class DownloadQueue(
             .filter { it.status == Download.State.DOWNLOADING }
     }
 
-    fun getProgressAsFlow(): Flow<Download> {
-        return getProgressObservable().asFlow()
-    }
+    fun getProgressAsFlow(): Flow<Download> = getProgressObservable().asFlow()
 
     private fun setPagesSubject(pages: List<Page>?, subject: PublishSubject<Int>?) {
         pages?.forEach { it.setStatusSubject(subject) }

app/src/main/java/eu/kanade/tachiyomi/ui/download/DownloadPresenter.kt

@@ -11,7 +11,6 @@ import eu.kanade.tachiyomi.util.system.logcat
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.catch
-import kotlinx.coroutines.flow.collect
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch

app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryPresenter.kt

@@ -46,7 +46,6 @@ import eu.kanade.tachiyomi.source.SourceManager
 import eu.kanade.tachiyomi.source.model.SManga
 import eu.kanade.tachiyomi.source.online.HttpSource
 import eu.kanade.tachiyomi.ui.base.presenter.BasePresenter
-import eu.kanade.tachiyomi.util.lang.combineLatest
 import eu.kanade.tachiyomi.util.lang.launchIO
 import eu.kanade.tachiyomi.util.lang.launchNonCancellable
 import eu.kanade.tachiyomi.util.removeCovers
@@ -687,6 +686,10 @@ class LibraryPresenter(
         state.selection = items.filterNot { it in selection }
     }
 
+    private fun <T, U, R> Observable<T>.combineLatest(o2: Observable<U>, combineFn: (T, U) -> R): Observable<R> {
+        return Observable.combineLatest(this, o2, combineFn)
+    }
+
     sealed class Dialog {
         data class ChangeCategory(val manga: List<Manga>, val initialSelection: List<CheckboxState<Category>>) : Dialog()
         data class DeleteManga(val manga: List<Manga>) : Dialog()

app/src/main/java/eu/kanade/tachiyomi/ui/more/MorePresenter.kt

@@ -9,17 +9,14 @@ import eu.kanade.tachiyomi.util.lang.launchIO
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
-import rx.Observable
-import rx.Subscription
-import rx.android.schedulers.AndroidSchedulers
-import rx.subscriptions.CompositeSubscription
+import kotlinx.coroutines.flow.collectLatest
+import kotlinx.coroutines.flow.combine
 import uy.kohesive.injekt.Injekt
 import uy.kohesive.injekt.api.get
 
 class MorePresenter(
     private val downloadManager: DownloadManager = Injekt.get(),
     preferences: BasePreferences = Injekt.get(),
-
 ) : BasePresenter<MoreController>() {
 
     val downloadedOnly = preferences.downloadedOnly().asState()
@@ -28,45 +25,16 @@ class MorePresenter(
     private var _state: MutableStateFlow<DownloadQueueState> = MutableStateFlow(DownloadQueueState.Stopped)
     val downloadQueueState: StateFlow<DownloadQueueState> = _state.asStateFlow()
 
-    private var isDownloading: Boolean = false
-    private var downloadQueueSize: Int = 0
-    private var untilDestroySubscriptions = CompositeSubscription()
-
     override fun onCreate(savedState: Bundle?) {
         super.onCreate(savedState)
 
-        if (untilDestroySubscriptions.isUnsubscribed) {
-            untilDestroySubscriptions = CompositeSubscription()
-        }
-
-        initDownloadQueueSummary()
-    }
-
-    override fun onDestroy() {
-        super.onDestroy()
-        untilDestroySubscriptions.unsubscribe()
-    }
-
-    private fun initDownloadQueueSummary() {
-        // Handle running/paused status change
-        DownloadService.runningRelay
-            .observeOn(AndroidSchedulers.mainThread())
-            .subscribeUntilDestroy { isRunning ->
-                isDownloading = isRunning
-                updateDownloadQueueState()
-            }
-
-        // Handle queue progress updating
-        downloadManager.queue.getUpdatedObservable()
-            .observeOn(AndroidSchedulers.mainThread())
-            .subscribeUntilDestroy {
-                downloadQueueSize = it.size
-                updateDownloadQueueState()
-            }
-    }
-
-    private fun updateDownloadQueueState() {
+        // Handle running/paused status change and queue progress updating
         presenterScope.launchIO {
+            combine(
+                DownloadService.isRunning,
+                downloadManager.queue.getUpdatedAsFlow(),
+            ) { isRunning, downloadQueue -> Pair(isRunning, downloadQueue.size) }
+                .collectLatest { (isDownloading, downloadQueueSize) ->
                     val pendingDownloadExists = downloadQueueSize != 0
                     _state.value = when {
                         !pendingDownloadExists -> DownloadQueueState.Stopped
@@ -76,9 +44,6 @@ class MorePresenter(
                     }
                 }
         }
-
-    private fun <T> Observable<T>.subscribeUntilDestroy(onNext: (T) -> Unit): Subscription {
-        return subscribe(onNext).also { untilDestroySubscriptions.add(it) }
     }
 }
 

app/src/main/java/eu/kanade/tachiyomi/ui/recent/updates/UpdatesPresenter.kt

@@ -33,7 +33,6 @@ import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.catch
 import kotlinx.coroutines.flow.collectLatest
 import kotlinx.coroutines.flow.distinctUntilChanged
-import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.receiveAsFlow
 import kotlinx.coroutines.launch
 import logcat.LogPriority

app/src/main/java/eu/kanade/tachiyomi/util/lang/RxExtensions.kt

@@ -1,11 +1,6 @@
 package eu.kanade.tachiyomi.util.lang
 
-import rx.Observable
 import rx.Subscription
 import rx.subscriptions.CompositeSubscription
 
 operator fun CompositeSubscription.plusAssign(subscription: Subscription) = add(subscription)
-
-fun <T, U, R> Observable<T>.combineLatest(o2: Observable<U>, combineFn: (T, U) -> R): Observable<R> {
-    return Observable.combineLatest(this, o2, combineFn)
-}