/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package backtype.storm.drpc;
import backtype.storm.task.OutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.topology.base.BaseRichBolt;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Tuple;
import backtype.storm.tuple.Values;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class JoinResult extends BaseRichBolt {
public static Logger LOG = LoggerFactory.getLogger(JoinResult.class);
String returnComponent;
Map<Object, Tuple> returns = new HashMap<Object, Tuple>();
Map<Object, Tuple> results = new HashMap<Object, Tuple>();
OutputCollector _collector;
public JoinResult(String returnComponent) {
this.returnComponent = returnComponent;
}
public void prepare(Map map, TopologyContext context, OutputCollector collector) {
_collector = collector;
}
public void execute(Tuple tuple) {
Object requestId = tuple.getValue(0);
if(tuple.getSourceComponent().equals(returnComponent)) {
returns.put(requestId, tuple);
} else {
results.put(requestId, tuple);
}
if(returns.containsKey(requestId) && results.containsKey(requestId)) {
Tuple result = results.remove(requestId);
Tuple returner = returns.remove(requestId);
LOG.debug(result.getValue(1).toString());
List<Tuple> anchors = new ArrayList<Tuple>();
anchors.add(result);
anchors.add(returner);
_collector.emit(anchors, new Values(""+result.getValue(1), returner.getValue(1)));
_collector.ack(result);
_collector.ack(returner);
}
}
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(new Fields("result", "return-info"));
}
}