| /** |
| * 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")); |
| } |
| } |