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

Example 1 with StartFeedStatement

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

the class QueryTranslator method handleStartFeedStatement.

private void handleStartFeedStatement(MetadataProvider metadataProvider, Statement stmt, IHyracksClientConnection hcc) throws Exception {
    StartFeedStatement sfs = (StartFeedStatement) stmt;
    String dataverseName = getActiveDataverse(sfs.getDataverseName());
    String feedName = sfs.getFeedName().getValue();
    // Transcation handler
    MetadataTransactionContext mdTxnCtx = MetadataManager.INSTANCE.beginTransaction();
    metadataProvider.setMetadataTxnContext(mdTxnCtx);
    // Runtime handler
    EntityId entityId = new EntityId(Feed.EXTENSION_NAME, dataverseName, feedName);
    // Feed & Feed Connections
    Feed feed = FeedMetadataUtil.validateIfFeedExists(dataverseName, feedName, metadataProvider.getMetadataTxnContext());
    List<FeedConnection> feedConnections = MetadataManager.INSTANCE.getFeedConections(metadataProvider.getMetadataTxnContext(), dataverseName, feedName);
    ILangCompilationProvider compilationProvider = new AqlCompilationProvider();
    IStorageComponentProvider storageComponentProvider = new StorageComponentProvider();
    DefaultStatementExecutorFactory qtFactory = new DefaultStatementExecutorFactory();
    ActiveLifecycleListener activeListener = (ActiveLifecycleListener) appCtx.getActiveLifecycleListener();
    ActiveJobNotificationHandler activeEventHandler = activeListener.getNotificationHandler();
    FeedEventsListener listener = (FeedEventsListener) activeEventHandler.getActiveEntityListener(entityId);
    if (listener != null) {
        throw new AlgebricksException("Feed " + feedName + " is started already.");
    }
    // Start
    MetadataLockManager.INSTANCE.startFeedBegin(metadataProvider.getLocks(), dataverseName, dataverseName + "." + feedName, feedConnections);
    try {
        // Prepare policy
        List<IDataset> datasets = new ArrayList<>();
        for (FeedConnection connection : feedConnections) {
            Dataset ds = metadataProvider.findDataset(connection.getDataverseName(), connection.getDatasetName());
            datasets.add(ds);
        }
        org.apache.commons.lang3.tuple.Pair<JobSpecification, AlgebricksAbsolutePartitionConstraint> jobInfo = FeedOperations.buildStartFeedJob(sessionOutput, metadataProvider, feed, feedConnections, compilationProvider, storageComponentProvider, qtFactory, hcc);
        JobSpecification feedJob = jobInfo.getLeft();
        listener = new FeedEventsListener(appCtx, entityId, datasets, jobInfo.getRight().getLocations());
        activeEventHandler.registerListener(listener);
        IActiveEventSubscriber eventSubscriber = listener.subscribe(ActivityState.STARTED);
        feedJob.setProperty(ActiveJobNotificationHandler.ACTIVE_ENTITY_PROPERTY_NAME, entityId);
        JobUtils.runJob(hcc, feedJob, Boolean.valueOf(metadataProvider.getConfig().get(StartFeedStatement.WAIT_FOR_COMPLETION)));
        eventSubscriber.sync();
        LOGGER.log(Level.INFO, "Submitted");
    } catch (Exception e) {
        abort(e, e, mdTxnCtx);
        if (listener != null) {
            activeEventHandler.unregisterListener(listener);
        }
        throw e;
    } finally {
        metadataProvider.getLocks().unlock();
    }
}