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/**
* Registers a DownloadReceiver and waits for all Downloads
* to complete, then stops
* */
package de.podfetcher.service;
import java.io.File;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import de.podfetcher.feed.*;
import de.podfetcher.storage.DownloadRequester;
import android.app.Service;
import android.app.DownloadManager;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.util.Log;
public class DownloadService extends Service {
private static final String TAG = "DownloadService";
public static String ACTION_ALL_FEED_DOWNLOADS_COMPLETED = "action.de.podfetcher.storage.all_feed_downloads_completed";
public static final String ACTION_FEED_SYNC_COMPLETED = "action.de.podfetcher.service.feed_sync_completed";
private ExecutorService syncExecutor;
private DownloadRequester requester;
private FeedManager manager;
@Override
public void onCreate() {
Log.d(TAG, "Service started");
registerReceiver(downloadReceiver, createIntentFilter());
syncExecutor = Executors.newSingleThreadExecutor();
manager = FeedManager.getInstance();
requester = DownloadRequester.getInstance();
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onDestroy() {
Log.d(TAG, "Service shutting down");
sendBroadcast(new Intent(ACTION_FEED_SYNC_COMPLETED));
}
private IntentFilter createIntentFilter() {
IntentFilter filter = new IntentFilter();
filter.addAction(DownloadManager.ACTION_DOWNLOAD_COMPLETE);
return filter;
}
/** Shuts down Executor service and prepares for shutdown */
private void initiateShutdown() {
Log.d(TAG, "Initiating shutdown");
// Wait until PoolExecutor is done
Thread waiter = new Thread() {
@Override
public void run() {
syncExecutor.shutdown();
try {
Log.d(TAG, "Starting to wait for termination");
boolean b = syncExecutor.awaitTermination(20L, TimeUnit.SECONDS);
Log.d(TAG, "Stopping waiting for termination; Result : "+ b);
stopSelf();
}catch(InterruptedException e) {
e.printStackTrace();
}
}
};
waiter.start();
}
private BroadcastReceiver downloadReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
long downloadId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, 0);
Feed feed = requester.getFeed(downloadId);
if(feed != null) {
handleCompletedFeedDownload(context, feed);
}else {
FeedImage image = requester.getFeedImage(downloadId);
if(image != null) {
handleCompletedImageDownload(context, image);
}
}
// Check if there's something else to download, otherwise stop
if(requester.getNumberOfDownloads() == 0) {
unregisterReceiver(downloadReceiver);
initiateShutdown();
}
}
};
/** Is called whenever a Feed is downloaded */
private void handleCompletedFeedDownload(Context context, Feed feed) {
Log.d(TAG, "Handling completed Feed Download");
// Get Feed Information
//feed.setFile_url((new File(requester.getFeedfilePath(context), requester.getFeedfileName(feed.getId()))).toString());
syncExecutor.execute(new FeedSyncThread(feed, this, requester));
}
/** Is called whenever a Feed-Image is downloaded */
private void handleCompletedImageDownload(Context context, FeedImage image) {
Log.d(TAG, "Handling completed Image Download");
requester.removeFeedImage(image);
//image.setFile_url(requester.getImagefilePath(context) + requester.getImagefileName(image.getId()));
manager.setFeedImage(this, image);
}
/** Takes a single Feed, parses the corresponding file and refreshes information in the manager */
class FeedSyncThread implements Runnable {
private static final String TAG = "FeedSyncThread";
private Feed feed;
private DownloadService service;
private DownloadRequester requester;
public FeedSyncThread(Feed feed, DownloadService service, DownloadRequester requester) {
this.feed = feed;
this.service = service;
this.requester = requester;
}
public void run() {
FeedManager manager = FeedManager.getInstance();
FeedHandler handler = new FeedHandler();
feed = handler.parseFeed(feed);
Log.d(TAG, feed.getTitle() + " parsed");
// Download Feed Image if provided
if(feed.getImage() != null) {
Log.d(TAG, "Feed has image; Downloading....");
requester.downloadImage(service, feed.getImage());
}
requester.removeFeed(feed);
cleanup();
// Save information of feed in DB
manager.updateFeed(service, feed);
}
/** Delete files that aren't needed anymore */
private void cleanup() {
if(new File(feed.getFile_url()).delete())
Log.d(TAG, "Successfully deleted cache file."); else Log.e(TAG, "Failed to delete cache file.");
feed.setFile_url(null);
}
}
}
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