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MediaPlayerPool.java
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MediaPlayerPool.java
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/*******************************************************************************
* Copyright 2013 Chris Rhoden, Rebecca Nesson, Public Radio Exchange
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
package org.prx.playerhater.mediaplayer;
import android.content.Context;
import android.net.Uri;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.prx.playerhater.util.Log;
public class MediaPlayerPool<P extends SynchronousPlayer> {
private final Map<Uri, P> mMediaPlayers = new HashMap<Uri, P>();
private final Set<P> mIdlePlayers = new HashSet<P>();
private final List<Uri> mRequests = new ArrayList<Uri>();
private final Class<? extends P> mClass;
public static <SynchronousPlayerClass extends SynchronousPlayer> MediaPlayerPool<SynchronousPlayerClass> getInstance(
Class<SynchronousPlayerClass> klass) {
return new MediaPlayerPool<SynchronousPlayerClass>(klass);
}
public MediaPlayerPool(Class<P> mediaPlayerClass) {
this(mediaPlayerClass, 3);
}
public MediaPlayerPool(Class<P> mediaPlayerClass, int size) {
mClass = mediaPlayerClass;
for (int i = 0; i < size; i++) {
try {
mIdlePlayers.add(mClass.newInstance());
} catch (InstantiationException e) {
throw new IllegalArgumentException(e);
} catch (IllegalAccessException e) {
throw new IllegalArgumentException(e);
}
}
}
public synchronized void release() {
for (SynchronousPlayer player : mIdlePlayers) {
player.release();
}
mIdlePlayers.clear();
for (Uri uri : mRequests) {
mMediaPlayers.remove(uri).release();
}
mRequests.clear();
for (SynchronousPlayer player : mMediaPlayers.values()) {
player.release();
}
mMediaPlayers.clear();
}
public synchronized void prepare(Context context, Uri uri) {
if (uri == null) {
throw new IllegalArgumentException(
"can't prepare a player for a null uri!");
}
if (!mMediaPlayers.containsKey(uri)) {
P player = getPlayer();
Log.d("Preparing " + player + " for " + uri);
player.prepare(context, uri);
addPlayer(player, uri);
}
}
public synchronized P getPlayer(Context context, Uri uri) {
Log.d("Getting player for " + uri);
if (mMediaPlayers.containsKey(uri)) {
mRequests.remove(uri);
Log.d("Found one (" + mMediaPlayers.get(uri) + ")");
return mMediaPlayers.remove(uri);
} else {
P player = getPlayer();
player.prepare(context, uri);
return player;
}
}
public synchronized void recycle(P player) {
if (player != null && player.getState() != StatelyPlayer.END) {
player.reset();
mIdlePlayers.add(player);
}
}
@SuppressWarnings("unchecked")
private synchronized P getPlayer() {
if (mIdlePlayers.size() > 0) {
P player = (P) mIdlePlayers.toArray()[0];
mIdlePlayers.remove(player);
Log.d("Getting idle player (" + player + ")");
return player;
} else if (mRequests.size() > 0) {
Uri leastRecentReq = mRequests.remove(mRequests.size() - 1);
Log.d("Recycling the player that is prepared for " + leastRecentReq);
P player = mMediaPlayers.remove(leastRecentReq);
Log.d("Player: " + player);
player.reset();
return player;
} else {
throw new IllegalStateException(
"MediaPlayer resources exhausted. Are you sure you're #recycle()ing on time?");
}
}
private synchronized void addPlayer(P player, Uri uri) {
mRequests.remove(uri);
mRequests.add(0, uri);
mMediaPlayers.put(uri, player);
}
}