450 lines
14 KiB
Kotlin
450 lines
14 KiB
Kotlin
package org.moire.ultrasonic.service
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import android.net.wifi.WifiManager
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import androidx.lifecycle.MutableLiveData
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import java.util.ArrayList
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import java.util.PriorityQueue
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import java.util.concurrent.Executors
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import java.util.concurrent.RejectedExecutionException
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import java.util.concurrent.ScheduledExecutorService
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import java.util.concurrent.TimeUnit
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import org.koin.core.component.KoinComponent
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import org.koin.core.component.inject
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import org.moire.ultrasonic.domain.MusicDirectory
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import org.moire.ultrasonic.domain.PlayerState
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import org.moire.ultrasonic.util.LRUCache
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import org.moire.ultrasonic.util.Settings
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import org.moire.ultrasonic.util.ShufflePlayBuffer
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import org.moire.ultrasonic.util.Util
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import timber.log.Timber
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/**
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* This class is responsible for maintaining the playlist and downloading
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* its items from the network to the filesystem.
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*
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* TODO: Move away from managing the queue with scheduled checks, instead use callbacks when
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* Downloads are finished
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*/
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class Downloader(
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private val shufflePlayBuffer: ShufflePlayBuffer,
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private val externalStorageMonitor: ExternalStorageMonitor,
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private val localMediaPlayer: LocalMediaPlayer
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) : KoinComponent {
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val playlist: MutableList<DownloadFile> = ArrayList()
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var started: Boolean = false
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private val downloadQueue: PriorityQueue<DownloadFile> = PriorityQueue<DownloadFile>()
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private val activelyDownloading: MutableList<DownloadFile> = ArrayList()
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val observableList: MutableLiveData<List<DownloadFile>> = MutableLiveData<List<DownloadFile>>()
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private val jukeboxMediaPlayer: JukeboxMediaPlayer by inject()
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private val downloadFileCache = LRUCache<MusicDirectory.Entry, DownloadFile>(100)
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private var executorService: ScheduledExecutorService? = null
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private var wifiLock: WifiManager.WifiLock? = null
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var playlistUpdateRevision: Long = 0
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private set
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val downloadChecker = Runnable {
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try {
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Timber.w("Checking Downloads")
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checkDownloadsInternal()
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} catch (all: Exception) {
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Timber.e(all, "checkDownloads() failed.")
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}
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}
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fun onDestroy() {
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stop()
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clearPlaylist()
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clearBackground()
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observableList.value = listOf()
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Timber.i("Downloader destroyed")
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}
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fun start() {
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started = true
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if (executorService == null) {
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executorService = Executors.newSingleThreadScheduledExecutor()
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executorService!!.scheduleWithFixedDelay(
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downloadChecker, 0L, CHECK_INTERVAL, TimeUnit.SECONDS
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)
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Timber.i("Downloader started")
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}
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if (wifiLock == null) {
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wifiLock = Util.createWifiLock(toString())
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wifiLock?.acquire()
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}
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}
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fun stop() {
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started = false
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executorService?.shutdown()
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executorService = null
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wifiLock?.release()
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wifiLock = null
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MediaPlayerService.runningInstance?.notifyDownloaderStopped()
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Timber.i("Downloader stopped")
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}
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fun checkDownloads() {
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if (
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executorService == null ||
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executorService!!.isTerminated ||
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executorService!!.isShutdown
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) {
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start()
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} else {
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try {
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executorService?.execute(downloadChecker)
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} catch (exception: RejectedExecutionException) {
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Timber.w(
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exception,
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"checkDownloads() can't run, maybe the Downloader is shutting down..."
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)
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}
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}
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}
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@Synchronized
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@Suppress("ComplexMethod")
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fun checkDownloadsInternal() {
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if (
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!Util.isExternalStoragePresent() ||
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!externalStorageMonitor.isExternalStorageAvailable
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) {
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return
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}
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if (shufflePlayBuffer.isEnabled) {
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checkShufflePlay()
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}
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if (jukeboxMediaPlayer.isEnabled || !Util.isNetworkConnected()) {
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return
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}
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// Check the active downloads for failures or completions and remove them
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// Store the result in a flag to know if changes have occurred
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var listChanged = cleanupActiveDownloads()
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// Check if need to preload more from playlist
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val preloadCount = Settings.preloadCount
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// Start preloading at the current playing song
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var start = currentPlayingIndex
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if (start == -1) start = 0
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val end = (start + preloadCount).coerceAtMost(playlist.size)
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for (i in start until end) {
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val download = playlist[i]
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// Set correct priority (the lower the number, the higher the priority)
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download.priority = i
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// Add file to queue if not in one of the queues already.
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if (!download.isWorkDone &&
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!activelyDownloading.contains(download) &&
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!downloadQueue.contains(download)
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) {
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listChanged = true
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downloadQueue.add(download)
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}
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}
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// Fill up active List with waiting tasks
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while (activelyDownloading.size < PARALLEL_DOWNLOADS && downloadQueue.size > 0) {
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val task = downloadQueue.remove()
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activelyDownloading.add(task)
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startDownloadOnService(task)
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// The next file on the playlist is currently downloading
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if (playlist.indexOf(task) == 1) {
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localMediaPlayer.setNextPlayerState(PlayerState.DOWNLOADING)
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}
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listChanged = true
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}
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// Stop Executor service when done downloading
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if (activelyDownloading.size == 0) {
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stop()
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}
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if (listChanged) {
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updateLiveData()
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}
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}
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private fun updateLiveData() {
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observableList.postValue(downloads)
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}
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private fun startDownloadOnService(task: DownloadFile) {
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MediaPlayerService.executeOnStartedMediaPlayerService {
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task.download()
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}
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}
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/**
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* Return true if modifications were made
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*/
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private fun cleanupActiveDownloads(): Boolean {
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val oldSize = activelyDownloading.size
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activelyDownloading.retainAll {
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when {
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it.isDownloading -> true
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it.isFailed && it.shouldRetry() -> {
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// Add it back to queue
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downloadQueue.add(it)
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false
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}
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else -> {
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it.cleanup()
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false
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}
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}
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}
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return (oldSize != activelyDownloading.size)
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}
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@get:Synchronized
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val currentPlayingIndex: Int
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get() = playlist.indexOf(localMediaPlayer.currentPlaying)
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@get:Synchronized
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val downloadListDuration: Long
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get() {
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var totalDuration: Long = 0
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for (downloadFile in playlist) {
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val song = downloadFile.song
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if (!song.isDirectory) {
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if (song.artist != null) {
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if (song.duration != null) {
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totalDuration += song.duration!!.toLong()
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}
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}
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}
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}
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return totalDuration
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}
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@get:Synchronized
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val all: List<DownloadFile>
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get() {
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val temp: MutableList<DownloadFile> = ArrayList()
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temp.addAll(activelyDownloading)
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temp.addAll(downloadQueue)
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temp.addAll(playlist)
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return temp.distinct().sorted()
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}
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/*
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* Returns a list of all DownloadFiles that are currently downloading or waiting for download,
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* including undownloaded files from the playlist.
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*/
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@get:Synchronized
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val downloads: List<DownloadFile>
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get() {
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val temp: MutableList<DownloadFile> = ArrayList()
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temp.addAll(activelyDownloading)
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temp.addAll(downloadQueue)
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temp.addAll(
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playlist.filter {
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when (it.status.value) {
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DownloadStatus.DOWNLOADING -> true
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else -> false
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}
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}
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)
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return temp.distinct().sorted()
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}
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@Synchronized
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fun clearPlaylist() {
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playlist.clear()
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// Cancel all active downloads with a high priority
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for (download in activelyDownloading) {
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if (download.priority < 100) {
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download.cancelDownload()
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activelyDownloading.remove(download)
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}
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}
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playlistUpdateRevision++
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updateLiveData()
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}
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@Synchronized
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private fun clearBackground() {
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// Clear the pending queue
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downloadQueue.clear()
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// Cancel all active downloads with a low priority
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for (download in activelyDownloading) {
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if (download.priority >= 100) {
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download.cancelDownload()
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activelyDownloading.remove(download)
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}
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}
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}
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@Synchronized
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fun clearActiveDownloads() {
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// Cancel all active downloads
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for (download in activelyDownloading) {
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download.cancelDownload()
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}
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activelyDownloading.clear()
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updateLiveData()
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}
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@Synchronized
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fun removeFromPlaylist(downloadFile: DownloadFile) {
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if (activelyDownloading.contains(downloadFile)) {
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downloadFile.cancelDownload()
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}
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playlist.remove(downloadFile)
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playlistUpdateRevision++
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checkDownloads()
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}
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@Synchronized
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fun addToPlaylist(
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songs: List<MusicDirectory.Entry?>,
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save: Boolean,
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autoPlay: Boolean,
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playNext: Boolean,
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newPlaylist: Boolean
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) {
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shufflePlayBuffer.isEnabled = false
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var offset = 1
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if (songs.isEmpty()) {
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return
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}
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if (newPlaylist) {
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playlist.clear()
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}
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if (playNext) {
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if (autoPlay && currentPlayingIndex >= 0) {
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offset = 0
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}
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for (song in songs) {
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val downloadFile = DownloadFile(song!!, save)
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playlist.add(currentPlayingIndex + offset, downloadFile)
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offset++
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}
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} else {
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for (song in songs) {
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val downloadFile = DownloadFile(song!!, save)
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playlist.add(downloadFile)
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}
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}
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playlistUpdateRevision++
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checkDownloads()
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}
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@Synchronized
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fun downloadBackground(songs: List<MusicDirectory.Entry>, save: Boolean) {
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// Because of the priority handling we add the songs in the reverse order they
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// were requested, then it is correct in the end.
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for (song in songs.asReversed()) {
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downloadQueue.add(DownloadFile(song, save))
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}
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checkDownloads()
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}
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@Synchronized
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fun shuffle() {
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playlist.shuffle()
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// Move the current song to the top..
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if (localMediaPlayer.currentPlaying != null) {
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playlist.remove(localMediaPlayer.currentPlaying)
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playlist.add(0, localMediaPlayer.currentPlaying!!)
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}
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playlistUpdateRevision++
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}
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@Synchronized
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@Suppress("ReturnCount")
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fun getDownloadFileForSong(song: MusicDirectory.Entry): DownloadFile {
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for (downloadFile in playlist) {
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if (downloadFile.song == song) {
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return downloadFile
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}
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}
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for (downloadFile in activelyDownloading) {
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if (downloadFile.song == song) {
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return downloadFile
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}
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}
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for (downloadFile in downloadQueue) {
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if (downloadFile.song == song) {
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return downloadFile
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}
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}
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var downloadFile = downloadFileCache[song]
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if (downloadFile == null) {
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downloadFile = DownloadFile(song, false)
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downloadFileCache.put(song, downloadFile)
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}
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return downloadFile
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}
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@Synchronized
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private fun checkShufflePlay() {
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// Get users desired random playlist size
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val listSize = Settings.maxSongs
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val wasEmpty = playlist.isEmpty()
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val revisionBefore = playlistUpdateRevision
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// First, ensure that list is at least 20 songs long.
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val size = playlist.size
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if (size < listSize) {
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for (song in shufflePlayBuffer[listSize - size]) {
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val downloadFile = DownloadFile(song, false)
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playlist.add(downloadFile)
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playlistUpdateRevision++
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}
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}
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val currIndex = if (localMediaPlayer.currentPlaying == null) 0 else currentPlayingIndex
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// Only shift playlist if playing song #5 or later.
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if (currIndex > SHUFFLE_BUFFER_LIMIT) {
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val songsToShift = currIndex - 2
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for (song in shufflePlayBuffer[songsToShift]) {
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playlist.add(DownloadFile(song, false))
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playlist[0].cancelDownload()
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playlist.removeAt(0)
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playlistUpdateRevision++
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}
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}
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if (revisionBefore != playlistUpdateRevision) {
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jukeboxMediaPlayer.updatePlaylist()
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}
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if (wasEmpty && playlist.isNotEmpty()) {
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if (jukeboxMediaPlayer.isEnabled) {
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jukeboxMediaPlayer.skip(0, 0)
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localMediaPlayer.setPlayerState(PlayerState.STARTED)
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} else {
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localMediaPlayer.play(playlist[0])
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}
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}
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}
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companion object {
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const val PARALLEL_DOWNLOADS = 3
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const val CHECK_INTERVAL = 5L
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const val SHUFFLE_BUFFER_LIMIT = 4
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}
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}
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