/*
* Copyright 2008-2013, ETH Zürich, Samuel Welten, Michael Kuhn, Tobias Langner,
* Sandro Affentranger, Lukas Bossard, Michael Grob, Rahul Jain,
* Dominic Langenegger, Sonia Mayor Alonso, Roger Odermatt, Tobias Schlueter,
* Yannick Stucki, Sebastian Wendland, Samuel Zehnder, Samuel Zihlmann,
* Samuel Zweifel
*
* This file is part of Jukefox.
*
* Jukefox 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 any later version. Jukefox 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
* Jukefox. If not, see <http://www.gnu.org/licenses/>.
*/
package ch.ethz.dcg.pancho3.tablet.widget;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentLinkedQueue;
import android.graphics.Bitmap;
import ch.ethz.dcg.jukefox.commons.utils.Pair;
import ch.ethz.dcg.jukefox.model.collection.BaseAlbum;
import ch.ethz.dcg.pancho3.tablet.model.DataFetcher;
import ch.ethz.dcg.pancho3.tablet.model.DataFetcher.OnDataFetchedListener;
public class ImageLoadingPool implements OnDataFetchedListener<List<Pair<Bitmap, BaseAlbum>>> {
private final DataFetcher dataFetcher;
private final ConcurrentHashMap<BaseAlbum, AlbumImageView> albumWaitMap =
new ConcurrentHashMap<BaseAlbum, AlbumImageView>();
private final ConcurrentLinkedQueue<QueueItem> queue = new ConcurrentLinkedQueue<QueueItem>();
private FetchingThread fetchingThread = null;
public ImageLoadingPool(DataFetcher dataFetcher) {
this.dataFetcher = dataFetcher;
}
static class QueueItem {
public BaseAlbum album;
public AlbumImageView view;
public long timestamp;
}
public void add(AlbumImageView view, BaseAlbum album) {
QueueItem item = new QueueItem();
item.view = view;
item.album = album;
item.timestamp = System.currentTimeMillis();
queue.add(item);
if (fetchingThread == null || !fetchingThread.isRunning()) {
fetchingThread = new FetchingThread();
fetchingThread.start();
}
}
private class FetchingThread extends Thread {
private static final long MIN_WAIT_TIME = 100;
private boolean running = true;
@Override
public void run() {
while (true) {
if (queue.isEmpty()) {
break;
}
QueueItem item = queue.peek();
long delta = System.currentTimeMillis() - item.timestamp;
if (delta < MIN_WAIT_TIME) {
try {
Thread.sleep(delta);
} catch (InterruptedException e) {
}
} else {
queue.poll();
if (item.view.matchAlbum(item.album)) {
fetchAlbumMap(item.album, item.view);
}
}
}
synchronized (this) {
running = false;
}
}
public synchronized boolean isRunning() {
return running;
}
}
private void fetchAlbumMap(BaseAlbum album, AlbumImageView view) {
albumWaitMap.put(album, view);
dataFetcher.fetchAlbumArt(this, false, false, album);
}
@Override
public void onDataFetched(List<Pair<Bitmap, BaseAlbum>> data) {
Bitmap bitmap = data.get(0).first;
BaseAlbum album = data.get(0).second;
AlbumImageView view = albumWaitMap.remove(album);
if (view != null) {
view.setBitmap(bitmap, album);
}
}
}