Examples with MetadataTransaction io.pravega.segmentstore.storage.metadata.MetadataTransaction used on opensource projects

Example 11 with MetadataTransaction

use of io.pravega.segmentstore.storage.metadata.MetadataTransaction in project pravega by pravega.

the class SystemJournal method validateSegment.

/**
 * Validate that all information for given segment in given snapshot exists in transaction.
 */
private CompletableFuture<Void> validateSegment(MetadataTransaction txn, String segmentName) {
    return txn.get(segmentName).thenComposeAsync(m -> {
        val segmentMetadata = (SegmentMetadata) m;
        Preconditions.checkState(null != segmentMetadata, "Segment metadata must not be null.");
        val chunkName = new AtomicReference<>(segmentMetadata.getFirstChunk());
        return Futures.loop(() -> chunkName.get() != null, () -> txn.get(chunkName.get()).thenAcceptAsync(mm -> {
            Preconditions.checkState(null != mm, "Chunk metadata must not be null.");
            val chunkMetadata = (ChunkMetadata) mm;
            chunkName.set(chunkMetadata.getNextChunk());
        }, executor), executor);
    }, executor);
}