MetaDataSpout.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 at
 *
 *     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 org.apache.flink.storm.tests.operators;

import java.util.Map;

import org.apache.storm.spout.SpoutOutputCollector;
import org.apache.storm.task.TopologyContext;
import org.apache.storm.topology.OutputFieldsDeclarer;
import org.apache.storm.topology.base.BaseRichSpout;
import org.apache.storm.tuple.Fields;
import org.apache.storm.tuple.Values;

public class MetaDataSpout extends BaseRichSpout {
	private static final long serialVersionUID = 5305870218033256376L;

	public static final String STREAM_ID = "spoutMeta";

	private SpoutOutputCollector collector;
	private TopologyContext context;

	@SuppressWarnings("rawtypes")
	@Override
	public void open(Map conf, TopologyContext context, SpoutOutputCollector collector) {
		this.collector = collector;
		this.context = context;
	}

	@Override
	public void nextTuple() {
		this.collector.emit(STREAM_ID, new Values(this.context.getThisComponentId(), STREAM_ID,
				this.context.getThisTaskId()));
	}

	@Override
	public void declareOutputFields(OutputFieldsDeclarer declarer) {
		declarer.declareStream(STREAM_ID, new Fields("id", "sid", "tid"));
	}

}