BatchNumberList.java

package backtype.storm.testing;

import backtype.storm.coordination.BatchOutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.topology.base.BaseBatchBolt;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Tuple;
import backtype.storm.tuple.Values;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;

public class BatchNumberList extends BaseBatchBolt {

	@Override
	public void declareOutputFields(OutputFieldsDeclarer declarer) {
		declarer.declare(new Fields("word", "list"));
	}

	String _wordComponent;

	public BatchNumberList(String wordComponent) {
		_wordComponent = wordComponent;
	}

	String word = null;
	List<Integer> intSet = new ArrayList<Integer>();
	BatchOutputCollector _collector;

	@Override
	public void prepare(Map conf, TopologyContext context,
			BatchOutputCollector collector, Object id) {
		_collector = collector;
	}

	@Override
	public void execute(Tuple tuple) {
		if (tuple.getSourceComponent().equals(_wordComponent)) {
			this.word = tuple.getString(1);
		} else {
			intSet.add(tuple.getInteger(1));
		}
	}

	@Override
	public void finishBatch() {
		if (word != null) {
			Collections.sort(intSet);
			_collector.emit(new Values(word, intSet));
		}
	}

}