BatchRepeatA.java

package backtype.storm.testing;

import backtype.storm.topology.BasicOutputCollector;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.topology.base.BaseBasicBolt;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Tuple;
import backtype.storm.tuple.Values;

public class BatchRepeatA extends BaseBasicBolt {

	@Override
	public void execute(Tuple input, BasicOutputCollector collector) {
		Object id = input.getValue(0);
		String word = input.getString(1);
		for (int i = 0; i < word.length(); i++) {
			if (word.charAt(i) == 'a') {
				collector.emit("multi", new Values(id, word.substring(0, i)));
			}
		}
		collector.emit("single", new Values(id, word));
	}

	@Override
	public void declareOutputFields(OutputFieldsDeclarer declarer) {
		declarer.declareStream("multi", new Fields("id", "word"));
		declarer.declareStream("single", new Fields("id", "word"));
	}

}