Examples with StopFeedStatement org.apache.asterix.lang.common.statement.StopFeedStatement used on opensource projects

Example 1 with StopFeedStatement

use of org.apache.asterix.lang.common.statement.StopFeedStatement in project asterixdb by apache.

the class QueryTranslator method handleStopFeedStatement.

private void handleStopFeedStatement(MetadataProvider metadataProvider, Statement stmt) throws Exception {
    StopFeedStatement sfst = (StopFeedStatement) stmt;
    String dataverseName = getActiveDataverse(sfst.getDataverseName());
    String feedName = sfst.getFeedName().getValue();
    EntityId feedId = new EntityId(Feed.EXTENSION_NAME, dataverseName, feedName);
    ActiveLifecycleListener activeListener = (ActiveLifecycleListener) appCtx.getActiveLifecycleListener();
    ActiveJobNotificationHandler activeEventHandler = activeListener.getNotificationHandler();
    // Obtain runtime info from ActiveListener
    FeedEventsListener listener = (FeedEventsListener) activeEventHandler.getActiveEntityListener(feedId);
    if (listener == null) {
        throw new AlgebricksException("Feed " + feedName + " is not started.");
    }
    IActiveEventSubscriber eventSubscriber = listener.subscribe(ActivityState.STOPPED);
    // Transaction
    MetadataTransactionContext mdTxnCtx = MetadataManager.INSTANCE.beginTransaction();
    metadataProvider.setMetadataTxnContext(mdTxnCtx);
    MetadataLockManager.INSTANCE.stopFeedBegin(metadataProvider.getLocks(), dataverseName, feedName);
    try {
        // validate
        FeedMetadataUtil.validateIfFeedExists(dataverseName, feedName, mdTxnCtx);
        // Construct ActiveMessage
        for (int i = 0; i < listener.getSources().length; i++) {
            String intakeLocation = listener.getSources()[i];
            FeedOperations.SendStopMessageToNode(appCtx, feedId, intakeLocation, i);
        }
        eventSubscriber.sync();
    } catch (Exception e) {
        abort(e, e, mdTxnCtx);
        throw e;
    } finally {
        metadataProvider.getLocks().unlock();
    }
}