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diff --git a/subsonic-android/src/github/daneren2005/subphonic/util/ShufflePlayBuffer.java b/subsonic-android/src/github/daneren2005/subphonic/util/ShufflePlayBuffer.java
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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 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();
+ }
+ }
+ }
+
+}