asterix-external-data/src/main/java/edu/uci/ics/asterix/feed/operator/FeedMessageOperatorNodePushable.java

/*
 * Copyright 2009-2011 by The Regents of the University of California
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * you may obtain a copy of the License from
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package edu.uci.ics.asterix.feed.operator;

import java.util.ArrayList;
import java.util.List;

import edu.uci.ics.asterix.feed.comm.IFeedMessage;
import edu.uci.ics.asterix.feed.mgmt.FeedId;
import edu.uci.ics.asterix.feed.mgmt.FeedSystemProvider;
import edu.uci.ics.asterix.feed.mgmt.IFeedManager;
import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
import edu.uci.ics.hyracks.dataflow.std.base.AbstractUnaryOutputSourceOperatorNodePushable;

public class FeedMessageOperatorNodePushable extends
		AbstractUnaryOutputSourceOperatorNodePushable {

	private final FeedId feedId;
	private final List<IFeedMessage> feedMessages;
	private IFeedManager feedManager;

	public FeedMessageOperatorNodePushable(IHyracksTaskContext ctx,
			FeedId feedId, List<IFeedMessage> feedMessages, boolean applyToAll,
			int partition, int nPartitions) {
		this.feedId = feedId;
		if (applyToAll) {
			this.feedMessages = feedMessages;
		} else {
			this.feedMessages = new ArrayList<IFeedMessage>();
			feedMessages.add(feedMessages.get(partition));
		}
		feedManager = (IFeedManager) FeedSystemProvider.getFeedManager();
	}

	@Override
	public void initialize() throws HyracksDataException {
		try {
			writer.open();
			for (IFeedMessage feedMessage : feedMessages) {
				feedManager.deliverMessage(feedId, feedMessage);
			}
		} catch (Exception e) {
			throw new HyracksDataException(e);
		} finally {
			writer.close();
		}
	}

}