Examples with BucketOwnershipListener io.pravega.controller.server.retention.BucketOwnershipListener used on opensource projects

Example 1 with BucketOwnershipListener

use of io.pravega.controller.server.retention.BucketOwnershipListener in project pravega by pravega.

the class ZKStreamMetadataStore method registerBucketOwnershipListener.

@Override
@SneakyThrows
public void registerBucketOwnershipListener(BucketOwnershipListener listener) {
    Preconditions.checkNotNull(listener);
    PathChildrenCacheListener bucketListener = (client, event) -> {
        switch(event.getType()) {
            case CHILD_ADDED:
                // no action required
                break;
            case CHILD_REMOVED:
                int bucketId = Integer.parseInt(ZKPaths.getNodeFromPath(event.getData().getPath()));
                listener.notify(new BucketNotification(bucketId, BucketNotification.NotificationType.BucketAvailable));
                break;
            case CONNECTION_LOST:
                listener.notify(new BucketNotification(Integer.MIN_VALUE, BucketNotification.NotificationType.ConnectivityError));
                break;
            default:
                log.warn("Received unknown event {}", event.getType());
        }
    };
    bucketOwnershipCacheRef.compareAndSet(null, new PathChildrenCache(storeHelper.getClient(), ZKStoreHelper.BUCKET_OWNERSHIP_PATH, true));
    bucketOwnershipCacheRef.get().getListenable().addListener(bucketListener);
    bucketOwnershipCacheRef.get().start(PathChildrenCache.StartMode.BUILD_INITIAL_CACHE);
    log.info("bucket ownership listener registered");
}