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 backtype.storm.utils.Utils;
import java.util.HashMap;
import java.util.Map;
public class KeyedSummingBatchBolt extends BaseBatchBolt {
BatchOutputCollector _collector;
Object _id;
Map<Object, Integer> _sums = new HashMap<Object, Integer>();
@Override
public void prepare(Map conf, TopologyContext context, BatchOutputCollector collector, Object id) {
_collector = collector;
_id = id;
}
@Override
public void execute(Tuple tuple) {
Object key = tuple.getValue(1);
int curr = Utils.get(_sums, key, 0);
_sums.put(key, curr + tuple.getInteger(2));
}
@Override
public void finishBatch() {
for(Object key: _sums.keySet()) {
_collector.emit(new Values(_id, key, _sums.get(key)));
}
}
@Override
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(new Fields("tx", "key", "sum"));
}
}