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

Example 1 with CreateFeedStatement

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

the class QueryTranslator method handleCreateFeedStatement.

protected void handleCreateFeedStatement(MetadataProvider metadataProvider, Statement stmt) throws Exception {
    CreateFeedStatement cfs = (CreateFeedStatement) stmt;
    String dataverseName = getActiveDataverse(cfs.getDataverseName());
    String feedName = cfs.getFeedName().getValue();
    MetadataTransactionContext mdTxnCtx = MetadataManager.INSTANCE.beginTransaction();
    metadataProvider.setMetadataTxnContext(mdTxnCtx);
    MetadataLockManager.INSTANCE.createFeedBegin(metadataProvider.getLocks(), dataverseName, dataverseName + "." + feedName);
    Feed feed = null;
    try {
        feed = MetadataManager.INSTANCE.getFeed(metadataProvider.getMetadataTxnContext(), dataverseName, feedName);
        if (feed != null) {
            if (cfs.getIfNotExists()) {
                MetadataManager.INSTANCE.commitTransaction(mdTxnCtx);
                return;
            } else {
                throw new AlgebricksException("A feed with this name " + feedName + " already exists.");
            }
        }
        String adaptorName = cfs.getAdaptorName();
        feed = new Feed(dataverseName, feedName, adaptorName, cfs.getAdaptorConfiguration());
        FeedMetadataUtil.validateFeed(feed, mdTxnCtx, appCtx);
        MetadataManager.INSTANCE.addFeed(metadataProvider.getMetadataTxnContext(), feed);
        MetadataManager.INSTANCE.commitTransaction(mdTxnCtx);
    } catch (Exception e) {
        abort(e, e, mdTxnCtx);
        throw e;
    } finally {
        metadataProvider.getLocks().unlock();
    }
}