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

Example 1 with FeedDropStatement

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

the class QueryTranslator method handleDropFeedStatement.

protected void handleDropFeedStatement(MetadataProvider metadataProvider, Statement stmt, IHyracksClientConnection hcc) throws Exception {
    FeedDropStatement stmtFeedDrop = (FeedDropStatement) stmt;
    String dataverseName = getActiveDataverse(stmtFeedDrop.getDataverseName());
    String feedName = stmtFeedDrop.getFeedName().getValue();
    MetadataTransactionContext mdTxnCtx = MetadataManager.INSTANCE.beginTransaction();
    metadataProvider.setMetadataTxnContext(mdTxnCtx);
    MetadataLockManager.INSTANCE.dropFeedBegin(metadataProvider.getLocks(), dataverseName, dataverseName + "." + feedName);
    try {
        Feed feed = MetadataManager.INSTANCE.getFeed(mdTxnCtx, dataverseName, feedName);
        if (feed == null) {
            if (!stmtFeedDrop.getIfExists()) {
                throw new AlgebricksException("There is no feed with this name " + feedName + ".");
            }
            MetadataManager.INSTANCE.commitTransaction(mdTxnCtx);
            return;
        }
        EntityId feedId = new EntityId(Feed.EXTENSION_NAME, dataverseName, feedName);
        ActiveLifecycleListener activeListener = (ActiveLifecycleListener) appCtx.getActiveLifecycleListener();
        ActiveJobNotificationHandler activeEventHandler = activeListener.getNotificationHandler();
        FeedEventsListener listener = (FeedEventsListener) activeEventHandler.getActiveEntityListener(feedId);
        if (listener != null) {
            throw new AlgebricksException("Feed " + feedId + " is currently active and connected to the following dataset(s) \n" + listener.toString());
        } else {
            JobSpecification spec = FeedOperations.buildRemoveFeedStorageJob(metadataProvider, MetadataManager.INSTANCE.getFeed(mdTxnCtx, feedId.getDataverse(), feedId.getEntityName()));
            JobUtils.runJob(hcc, spec, true);
            MetadataManager.INSTANCE.dropFeed(mdTxnCtx, dataverseName, feedName);
        }
        if (LOGGER.isLoggable(Level.INFO)) {
            LOGGER.info("Removed feed " + feedId);
        }
        MetadataManager.INSTANCE.commitTransaction(mdTxnCtx);
    } catch (Exception e) {
        abort(e, e, mdTxnCtx);
        throw e;
    } finally {
        metadataProvider.getLocks().unlock();
    }
}