package backtype.storm.testing;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.coordination.BatchOutputCollector;
import backtype.storm.topology.base.BaseTransactionalBolt;
import backtype.storm.transactional.ICommitter;
import backtype.storm.transactional.TransactionAttempt;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Tuple;
import backtype.storm.tuple.Values;
import java.util.Map;
public class CountingCommitBolt extends BaseTransactionalBolt implements ICommitter {
BatchOutputCollector _collector;
TransactionAttempt _id;
int _count = 0;
@Override
public void prepare(Map conf, TopologyContext context, BatchOutputCollector collector, TransactionAttempt id) {
_id = id;
_collector = collector;
}
@Override
public void execute(Tuple tuple) {
_count++;
}
@Override
public void finishBatch() {
_collector.emit(new Values(_id, _count));
}
@Override
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(new Fields("tx", "count"));
}
}