| package backtype.storm.testing; |
| |
| import backtype.storm.task.TopologyContext; |
| import backtype.storm.topology.OutputFieldsDeclarer; |
| import backtype.storm.topology.base.BaseBatchBolt; |
| import backtype.storm.coordination.BatchOutputCollector; |
| import backtype.storm.tuple.Fields; |
| import backtype.storm.tuple.Tuple; |
| import backtype.storm.tuple.Values; |
| import java.util.Map; |
| |
| public class CountingBatchBolt extends BaseBatchBolt { |
| BatchOutputCollector _collector; |
| Object _id; |
| int _count = 0; |
| |
| @Override |
| public void prepare(Map conf, TopologyContext context, BatchOutputCollector collector, Object id) { |
| _collector = collector; |
| _id = id; |
| } |
| |
| @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")); |
| } |
| |
| } |