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Diffstat (limited to 'subsonic-android/src/github/daneren2005/subphonic/util/ShufflePlayBuffer.java')
-rw-r--r-- | subsonic-android/src/github/daneren2005/subphonic/util/ShufflePlayBuffer.java | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/subsonic-android/src/github/daneren2005/subphonic/util/ShufflePlayBuffer.java b/subsonic-android/src/github/daneren2005/subphonic/util/ShufflePlayBuffer.java new file mode 100644 index 00000000..c6bbf785 --- /dev/null +++ b/subsonic-android/src/github/daneren2005/subphonic/util/ShufflePlayBuffer.java @@ -0,0 +1,109 @@ +/* + This file is part of Subsonic. + + Subsonic is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + Subsonic is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with Subsonic. If not, see <http://www.gnu.org/licenses/>. + + Copyright 2009 (C) Sindre Mehus + */ +package github.daneren2005.subphonic.util; + +import java.util.ArrayList; +import java.util.List; +import java.util.concurrent.Executors; +import java.util.concurrent.ScheduledExecutorService; +import java.util.concurrent.TimeUnit; + +import android.content.Context; +import android.util.Log; +import github.daneren2005.subphonic.domain.MusicDirectory; +import github.daneren2005.subphonic.service.MusicService; +import github.daneren2005.subphonic.service.MusicServiceFactory; + +/** + * @author Sindre Mehus + * @version $Id$ + */ +public class ShufflePlayBuffer { + + private static final String TAG = ShufflePlayBuffer.class.getSimpleName(); + private static final int CAPACITY = 50; + private static final int REFILL_THRESHOLD = 40; + + private final ScheduledExecutorService executorService; + private final List<MusicDirectory.Entry> buffer = new ArrayList<MusicDirectory.Entry>(); + private Context context; + private int currentServer; + + public ShufflePlayBuffer(Context context) { + this.context = context; + executorService = Executors.newSingleThreadScheduledExecutor(); + Runnable runnable = new Runnable() { + @Override + public void run() { + refill(); + } + }; + executorService.scheduleWithFixedDelay(runnable, 1, 10, TimeUnit.SECONDS); + } + + public List<MusicDirectory.Entry> get(int size) { + clearBufferIfnecessary(); + + List<MusicDirectory.Entry> result = new ArrayList<MusicDirectory.Entry>(size); + synchronized (buffer) { + while (!buffer.isEmpty() && result.size() < size) { + result.add(buffer.remove(buffer.size() - 1)); + } + } + Log.i(TAG, "Taking " + result.size() + " songs from shuffle play buffer. " + buffer.size() + " remaining."); + return result; + } + + public void shutdown() { + executorService.shutdown(); + } + + private void refill() { + + // Check if active server has changed. + clearBufferIfnecessary(); + + if (buffer.size() > REFILL_THRESHOLD || (!Util.isNetworkConnected(context) && !Util.isOffline(context))) { + return; + } + + try { + MusicService service = MusicServiceFactory.getMusicService(context); + int n = CAPACITY - buffer.size(); + MusicDirectory songs = service.getRandomSongs(n, context, null); + + synchronized (buffer) { + buffer.addAll(songs.getChildren()); + Log.i(TAG, "Refilled shuffle play buffer with " + songs.getChildren().size() + " songs."); + } + } catch (Exception x) { + Log.w(TAG, "Failed to refill shuffle play buffer.", x); + } + } + + private void clearBufferIfnecessary() { + synchronized (buffer) { + if (currentServer != Util.getActiveServer(context)) { + currentServer = Util.getActiveServer(context); + buffer.clear(); + } + } + } + +} |