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/*
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 net.sourceforge.subsonic.androidapp.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 net.sourceforge.subsonic.androidapp.domain.MusicDirectory;
import net.sourceforge.subsonic.androidapp.service.MusicService;
import net.sourceforge.subsonic.androidapp.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();
}
}
}
}
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