content: /**
   * 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 org.apache.storm.starter;
  
  import com.alibaba.starter.utils.Assert;
  import com.alibaba.jstorm.utils.JStormUtils;
  
  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 testDrpc() {
          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());
          
          JStormUtils.sleepMs(30 * 1000);
          
          try {
              System.out.println(drpc.execute("exclamation", "aaa"));
              System.out.println(drpc.execute("exclamation", "bbb"));
          } catch (Exception e) {
              Assert.fail("Failed to test drpc");
          }
          
          drpc.shutdown();
          cluster.shutdown();
      }
      
      public static void main(String[] args) {
          
          testDrpc();
      }
  }
  