| /** |
| * 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 storm.starter; |
| |
| import backtype.storm.Config; |
| import backtype.storm.LocalCluster; |
| import backtype.storm.LocalDRPC; |
| import backtype.storm.drpc.DRPCSpout; |
| import backtype.storm.drpc.ReturnResults; |
| import backtype.storm.topology.BasicOutputCollector; |
| import backtype.storm.topology.OutputFieldsDeclarer; |
| import backtype.storm.topology.TopologyBuilder; |
| import backtype.storm.topology.base.BaseBasicBolt; |
| import backtype.storm.tuple.Fields; |
| import backtype.storm.tuple.Tuple; |
| import backtype.storm.tuple.Values; |
| |
| |
| public class ManualDRPC { |
| public static class ExclamationBolt extends BaseBasicBolt { |
| |
| @Override |
| public void declareOutputFields(OutputFieldsDeclarer declarer) { |
| declarer.declare(new Fields("result", "return-info")); |
| } |
| |
| @Override |
| public void execute(Tuple tuple, BasicOutputCollector collector) { |
| String arg = tuple.getString(0); |
| Object retInfo = tuple.getValue(1); |
| collector.emit(new Values(arg + "!!!", retInfo)); |
| } |
| |
| } |
| |
| public static void main(String[] args) { |
| TopologyBuilder builder = new TopologyBuilder(); |
| LocalDRPC drpc = new LocalDRPC(); |
| |
| DRPCSpout spout = new DRPCSpout("exclamation", drpc); |
| builder.setSpout("drpc", spout); |
| builder.setBolt("exclaim", new ExclamationBolt(), 3).shuffleGrouping("drpc"); |
| builder.setBolt("return", new ReturnResults(), 3).shuffleGrouping("exclaim"); |
| |
| LocalCluster cluster = new LocalCluster(); |
| Config conf = new Config(); |
| cluster.submitTopology("exclaim", conf, builder.createTopology()); |
| |
| System.out.println(drpc.execute("exclamation", "aaa")); |
| System.out.println(drpc.execute("exclamation", "bbb")); |
| |
| } |
| } |