ManualDRPC 1
/** * 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 com.sxt.storm.drpc; 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.err.println(drpc.execute("exclamation", "aaa")); System.err.println(drpc.execute("exclamation", "bbb")); } }