Examples with PriorityTooLowException com.google.android.exoplayer2.util.PriorityTaskManager.PriorityTooLowException used on opensource projects

Example 1 with PriorityTooLowException

use of com.google.android.exoplayer2.util.PriorityTaskManager.PriorityTooLowException in project ExoPlayer by google.

the class SegmentDownloader method download.

@Override
public final void download(@Nullable ProgressListener progressListener) throws IOException, InterruptedException {
    ArrayDeque<Segment> pendingSegments = new ArrayDeque<>();
    ArrayDeque<SegmentDownloadRunnable> recycledRunnables = new ArrayDeque<>();
    if (priorityTaskManager != null) {
        priorityTaskManager.add(C.PRIORITY_DOWNLOAD);
    }
    try {
        CacheDataSource dataSource = cacheDataSourceFactory.createDataSourceForDownloading();
        // Get the manifest and all of the segments.
        M manifest = getManifest(dataSource, manifestDataSpec, /* removing= */
        false);
        if (!streamKeys.isEmpty()) {
            manifest = manifest.copy(streamKeys);
        }
        List<Segment> segments = getSegments(dataSource, manifest, /* removing= */
        false);
        // Sort the segments so that we download media in the right order from the start of the
        // content, and merge segments where possible to minimize the number of server round trips.
        Collections.sort(segments);
        mergeSegments(segments, cacheKeyFactory);
        // Scan the segments, removing any that are fully downloaded.
        int totalSegments = segments.size();
        int segmentsDownloaded = 0;
        long contentLength = 0;
        long bytesDownloaded = 0;
        for (int i = segments.size() - 1; i >= 0; i--) {
            DataSpec dataSpec = segments.get(i).dataSpec;
            String cacheKey = cacheKeyFactory.buildCacheKey(dataSpec);
            long segmentLength = dataSpec.length;
            if (segmentLength == C.LENGTH_UNSET) {
                long resourceLength = ContentMetadata.getContentLength(cache.getContentMetadata(cacheKey));
                if (resourceLength != C.LENGTH_UNSET) {
                    segmentLength = resourceLength - dataSpec.position;
                }
            }
            long segmentBytesDownloaded = cache.getCachedBytes(cacheKey, dataSpec.position, segmentLength);
            bytesDownloaded += segmentBytesDownloaded;
            if (segmentLength != C.LENGTH_UNSET) {
                if (segmentLength == segmentBytesDownloaded) {
                    // The segment is fully downloaded.
                    segmentsDownloaded++;
                    segments.remove(i);
                }
                if (contentLength != C.LENGTH_UNSET) {
                    contentLength += segmentLength;
                }
            } else {
                contentLength = C.LENGTH_UNSET;
            }
        }
        // Download the segments.
        @Nullable ProgressNotifier progressNotifier = progressListener != null ? new ProgressNotifier(progressListener, contentLength, totalSegments, bytesDownloaded, segmentsDownloaded) : null;
        pendingSegments.addAll(segments);
        while (!isCanceled && !pendingSegments.isEmpty()) {
            // Block until there aren't any higher priority tasks.
            if (priorityTaskManager != null) {
                priorityTaskManager.proceed(C.PRIORITY_DOWNLOAD);
            }
            // Create and execute a runnable to download the next segment.
            CacheDataSource segmentDataSource;
            byte[] temporaryBuffer;
            if (!recycledRunnables.isEmpty()) {
                SegmentDownloadRunnable recycledRunnable = recycledRunnables.removeFirst();
                segmentDataSource = recycledRunnable.dataSource;
                temporaryBuffer = recycledRunnable.temporaryBuffer;
            } else {
                segmentDataSource = cacheDataSourceFactory.createDataSourceForDownloading();
                temporaryBuffer = new byte[BUFFER_SIZE_BYTES];
            }
            Segment segment = pendingSegments.removeFirst();
            SegmentDownloadRunnable downloadRunnable = new SegmentDownloadRunnable(segment, segmentDataSource, progressNotifier, temporaryBuffer);
            addActiveRunnable(downloadRunnable);
            executor.execute(downloadRunnable);
            // Clean up runnables that have finished.
            for (int j = activeRunnables.size() - 1; j >= 0; j--) {
                SegmentDownloadRunnable activeRunnable = (SegmentDownloadRunnable) activeRunnables.get(j);
                // it's already finished.
                if (pendingSegments.isEmpty() || activeRunnable.isDone()) {
                    try {
                        activeRunnable.get();
                        removeActiveRunnable(j);
                        recycledRunnables.addLast(activeRunnable);
                    } catch (ExecutionException e) {
                        Throwable cause = Assertions.checkNotNull(e.getCause());
                        if (cause instanceof PriorityTooLowException) {
                            // We need to schedule this segment again in a future loop iteration.
                            pendingSegments.addFirst(activeRunnable.segment);
                            removeActiveRunnable(j);
                            recycledRunnables.addLast(activeRunnable);
                        } else if (cause instanceof IOException) {
                            throw (IOException) cause;
                        } else {
                            // The cause must be an uncaught Throwable type.
                            Util.sneakyThrow(cause);
                        }
                    }
                }
            }
            // Don't move on to the next segment until the runnable for this segment has started. This
            // drip feeds runnables to the executor, rather than providing them all up front.
            downloadRunnable.blockUntilStarted();
        }
    } finally {
        // Cancel them to speed this up.
        for (int i = 0; i < activeRunnables.size(); i++) {
            activeRunnables.get(i).cancel(/* interruptIfRunning= */
            true);
        }
        // do this for the case where the main download thread was interrupted as part of cancelation.
        for (int i = activeRunnables.size() - 1; i >= 0; i--) {
            activeRunnables.get(i).blockUntilFinished();
            removeActiveRunnable(i);
        }
        if (priorityTaskManager != null) {
            priorityTaskManager.remove(C.PRIORITY_DOWNLOAD);
        }
    }
}