/*******************************************************************************
* This file is part of RedReader.
*
* RedReader 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.
*
* RedReader 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 RedReader. If not, see <http://www.gnu.org/licenses/>.
******************************************************************************/
package org.quantumbadger.redreader.cache;
import android.content.Context;
import org.quantumbadger.redreader.common.PrioritisedCachedThreadPool;
import java.util.HashSet;
class PrioritisedDownloadQueue {
private final HashSet<CacheDownload> redditDownloadsQueued = new HashSet<>();
private final PrioritisedCachedThreadPool mDownloadThreadPool = new PrioritisedCachedThreadPool(5, "Download");
public PrioritisedDownloadQueue(final Context context) {
new RedditQueueProcessor().start();
}
public synchronized void add(final CacheRequest request, final CacheManager manager) {
final CacheDownload download = new CacheDownload(request, manager, this);
if(request.queueType == CacheRequest.DOWNLOAD_QUEUE_REDDIT_API) {
redditDownloadsQueued.add(download);
notifyAll();
} else if(request.queueType == CacheRequest.DOWNLOAD_QUEUE_IMMEDIATE
|| request.queueType == CacheRequest.DOWNLOAD_QUEUE_IMGUR_API) {
new CacheDownloadThread(download, true, "Cache Download Thread: Immediate");
} else {
mDownloadThreadPool.add(download);
}
}
private synchronized CacheDownload getNextRedditInQueue() {
while(redditDownloadsQueued.isEmpty()) {
try { wait(); } catch (InterruptedException e) { throw new RuntimeException(e); }
}
CacheDownload next = null;
for(final CacheDownload entry : redditDownloadsQueued) {
if(next == null || entry.isHigherPriorityThan(next)) {
next = entry;
}
}
redditDownloadsQueued.remove(next);
return next;
}
private class RedditQueueProcessor extends Thread {
public RedditQueueProcessor() {
super("Reddit Queue Processor");
}
@Override
public void run() {
while(true) {
synchronized(this) {
final CacheDownload download = getNextRedditInQueue();
new CacheDownloadThread(download, true, "Cache Download Thread: Reddit");
}
try {
sleep(1200); // Delay imposed by reddit API restrictions.
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
}
}
}