/** Takes a single Feed, parses the corresponding file and refreshes information in the manager */
class FeedSyncThread extends Thread {
private static final String TAG = "FeedSyncThread";
private BlockingQueue<DownloadRequest> completedRequests =
new LinkedBlockingDeque<DownloadRequest>();
private CompletionService<Feed> parserService =
new ExecutorCompletionService<Feed>(Executors.newSingleThreadExecutor());
private ExecutorService dbService = Executors.newSingleThreadExecutor();
private Future<?> dbUpdateFuture;
private volatile boolean isActive = true;
private volatile boolean isCollectingRequests = false;
private final long WAIT_TIMEOUT = 3000;
/**
* Waits for completed requests. Once the first request has been taken, the method will wait
* WAIT_TIMEOUT ms longer to collect more completed requests.
*
* @return Collected feeds or null if the method has been interrupted during the first waiting
* period.
*/
private List<Feed> collectCompletedRequests() {
List<Feed> results = new LinkedList<Feed>();
DownloadRequester requester = DownloadRequester.getInstance();
int tasks = 0;
try {
DownloadRequest request = completedRequests.take();
parserService.submit(new FeedParserTask(request));
tasks++;
} catch (InterruptedException e) {
return null;
}
tasks += pollCompletedDownloads();
isCollectingRequests = true;
if (requester.isDownloadingFeeds()) {
// wait for completion of more downloads
long startTime = System.currentTimeMillis();
long currentTime = startTime;
while (requester.isDownloadingFeeds() && (currentTime - startTime) < WAIT_TIMEOUT) {
try {
if (BuildConfig.DEBUG)
Log.d(TAG, "Waiting for " + (startTime + WAIT_TIMEOUT - currentTime) + " ms");
sleep(startTime + WAIT_TIMEOUT - currentTime);
} catch (InterruptedException e) {
if (BuildConfig.DEBUG) Log.d(TAG, "interrupted while waiting for more downloads");
tasks += pollCompletedDownloads();
} finally {
currentTime = System.currentTimeMillis();
}
}
tasks += pollCompletedDownloads();
}
isCollectingRequests = false;
for (int i = 0; i < tasks; i++) {
try {
Feed f = parserService.take().get();
if (f != null) {
results.add(f);
}
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
}
return results;
}
private int pollCompletedDownloads() {
int tasks = 0;
for (int i = 0; i < completedRequests.size(); i++) {
parserService.submit(new FeedParserTask(completedRequests.poll()));
tasks++;
}
return tasks;
}
@Override
public void run() {
while (isActive) {
final List<Feed> feeds = collectCompletedRequests();
if (feeds == null) {
continue;
}
if (BuildConfig.DEBUG) Log.d(TAG, "Bundling " + feeds.size() + " feeds");
for (Feed feed : feeds) {
removeDuplicateImages(
feed); // duplicate images have to removed because the DownloadRequester does not
// accept two downloads with the same download URL yet.
}
// Save information of feed in DB
if (dbUpdateFuture != null) {
try {
dbUpdateFuture.get();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
}
dbUpdateFuture =
dbService.submit(
new Runnable() {
@Override
public void run() {
Feed[] savedFeeds =
DBTasks.updateFeed(
DownloadService.this, feeds.toArray(new Feed[feeds.size()]));
for (Feed savedFeed : savedFeeds) {
// Download Feed Image if provided and not downloaded
if (savedFeed.getImage() != null
&& savedFeed.getImage().isDownloaded() == false) {
if (BuildConfig.DEBUG) Log.d(TAG, "Feed has image; Downloading....");
savedFeed.getImage().setOwner(savedFeed);
final Feed savedFeedRef = savedFeed;
try {
requester.downloadImage(DownloadService.this, savedFeedRef.getImage());
} catch (DownloadRequestException e) {
e.printStackTrace();
DBWriter.addDownloadStatus(
DownloadService.this,
new DownloadStatus(
savedFeedRef.getImage(),
savedFeedRef.getImage().getHumanReadableIdentifier(),
DownloadError.ERROR_REQUEST_ERROR,
false,
e.getMessage()));
}
}
numberOfDownloads.decrementAndGet();
}
sendDownloadHandledIntent();
queryDownloadsAsync();
}
});
}
if (dbUpdateFuture != null) {
try {
dbUpdateFuture.get();
} catch (InterruptedException e) {
} catch (ExecutionException e) {
e.printStackTrace();
}
}
if (BuildConfig.DEBUG) Log.d(TAG, "Shutting down");
}
private class FeedParserTask implements Callable<Feed> {
private DownloadRequest request;
private FeedParserTask(DownloadRequest request) {
this.request = request;
}
@Override
public Feed call() throws Exception {
return parseFeed(request);
}
}
private Feed parseFeed(DownloadRequest request) {
Feed savedFeed = null;
Feed feed = new Feed(request.getSource(), new Date());
feed.setFile_url(request.getDestination());
feed.setId(request.getFeedfileId());
feed.setDownloaded(true);
feed.setPreferences(
new FeedPreferences(0, true, request.getUsername(), request.getPassword()));
DownloadError reason = null;
String reasonDetailed = null;
boolean successful = true;
FeedHandler feedHandler = new FeedHandler();
try {
feed = feedHandler.parseFeed(feed).feed;
if (BuildConfig.DEBUG) Log.d(TAG, feed.getTitle() + " parsed");
if (checkFeedData(feed) == false) {
throw new InvalidFeedException();
}
} catch (SAXException e) {
successful = false;
e.printStackTrace();
reason = DownloadError.ERROR_PARSER_EXCEPTION;
reasonDetailed = e.getMessage();
} catch (IOException e) {
successful = false;
e.printStackTrace();
reason = DownloadError.ERROR_PARSER_EXCEPTION;
reasonDetailed = e.getMessage();
} catch (ParserConfigurationException e) {
successful = false;
e.printStackTrace();
reason = DownloadError.ERROR_PARSER_EXCEPTION;
reasonDetailed = e.getMessage();
} catch (UnsupportedFeedtypeException e) {
e.printStackTrace();
successful = false;
reason = DownloadError.ERROR_UNSUPPORTED_TYPE;
reasonDetailed = e.getMessage();
} catch (InvalidFeedException e) {
e.printStackTrace();
successful = false;
reason = DownloadError.ERROR_PARSER_EXCEPTION;
reasonDetailed = e.getMessage();
}
// cleanup();
if (savedFeed == null) {
savedFeed = feed;
}
if (successful) {
return savedFeed;
} else {
saveDownloadStatus(
new DownloadStatus(
savedFeed,
savedFeed.getHumanReadableIdentifier(),
reason,
successful,
reasonDetailed));
return null;
}
}
/** Checks if the feed was parsed correctly. */
private boolean checkFeedData(Feed feed) {
if (feed.getTitle() == null) {
Log.e(TAG, "Feed has no title.");
return false;
}
if (!hasValidFeedItems(feed)) {
Log.e(TAG, "Feed has invalid items");
return false;
}
return true;
}
/**
* Checks if the FeedItems of this feed have images that point to the same URL. If two FeedItems
* have an image that points to the same URL, the reference of the second item is removed, so
* that every image reference is unique.
*/
private void removeDuplicateImages(Feed feed) {
for (int x = 0; x < feed.getItems().size(); x++) {
for (int y = x + 1; y < feed.getItems().size(); y++) {
FeedItem item1 = feed.getItems().get(x);
FeedItem item2 = feed.getItems().get(y);
if (item1.hasItemImage() && item2.hasItemImage()) {
if (StringUtils.equals(
item1.getImage().getDownload_url(), item2.getImage().getDownload_url())) {
item2.setImage(null);
}
}
}
}
}
private boolean hasValidFeedItems(Feed feed) {
for (FeedItem item : feed.getItems()) {
if (item.getTitle() == null) {
Log.e(TAG, "Item has no title");
return false;
}
if (item.getPubDate() == null) {
Log.e(TAG, "Item has no pubDate. Using current time as pubDate");
if (item.getTitle() != null) {
Log.e(TAG, "Title of invalid item: " + item.getTitle());
}
item.setPubDate(new Date());
}
}
return true;
}
/** Delete files that aren't needed anymore */
private void cleanup(Feed feed) {
if (feed.getFile_url() != null) {
if (new File(feed.getFile_url()).delete())
if (BuildConfig.DEBUG) Log.d(TAG, "Successfully deleted cache file.");
else Log.e(TAG, "Failed to delete cache file.");
feed.setFile_url(null);
} else if (BuildConfig.DEBUG) {
Log.d(TAG, "Didn't delete cache file: File url is not set.");
}
}
public void shutdown() {
isActive = false;
if (isCollectingRequests) {
interrupt();
}
}
public void submitCompletedDownload(DownloadRequest request) {
completedRequests.offer(request);
if (isCollectingRequests) {
interrupt();
}
}
}
@SuppressLint("NewApi")
@Override
public void onCreate() {
if (BuildConfig.DEBUG) Log.d(TAG, "Service started");
isRunning = true;
handler = new Handler();
completedDownloads = Collections.synchronizedList(new ArrayList<DownloadStatus>());
downloads = new ArrayList<Downloader>();
numberOfDownloads = new AtomicInteger(0);
IntentFilter cancelDownloadReceiverFilter = new IntentFilter();
cancelDownloadReceiverFilter.addAction(ACTION_CANCEL_ALL_DOWNLOADS);
cancelDownloadReceiverFilter.addAction(ACTION_CANCEL_DOWNLOAD);
registerReceiver(cancelDownloadReceiver, cancelDownloadReceiverFilter);
syncExecutor =
Executors.newSingleThreadExecutor(
new ThreadFactory() {
@Override
public Thread newThread(Runnable r) {
Thread t = new Thread(r);
t.setPriority(Thread.MIN_PRIORITY);
return t;
}
});
downloadExecutor =
new ExecutorCompletionService<Downloader>(
Executors.newFixedThreadPool(
NUM_PARALLEL_DOWNLOADS,
new ThreadFactory() {
@Override
public Thread newThread(Runnable r) {
Thread t = new Thread(r);
t.setPriority(Thread.MIN_PRIORITY);
return t;
}
}));
schedExecutor =
new ScheduledThreadPoolExecutor(
SCHED_EX_POOL_SIZE,
new ThreadFactory() {
@Override
public Thread newThread(Runnable r) {
Thread t = new Thread(r);
t.setPriority(Thread.MIN_PRIORITY);
return t;
}
},
new RejectedExecutionHandler() {
@Override
public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
Log.w(TAG, "SchedEx rejected submission of new task");
}
});
downloadCompletionThread.start();
feedSyncThread = new FeedSyncThread();
feedSyncThread.start();
setupNotificationBuilders();
requester = DownloadRequester.getInstance();
}
