storm自带例子详解 (四)——ManualDRPC
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/** * 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;/*** 手工(手动的)的分布式RPC*/public class ManualDRPC { // 定义一个Bolt,继承自BaseBasicBolt public static class ExclamationBolt extends BaseBasicBolt { // 定义输出字段 @Override public void declareOutputFields(OutputFieldsDeclarer declarer) { // 定义了两个输出字段,分别是:result、return-info declarer.declare(new Fields("result", "return-info")); }// 执行函数 @Override public void execute(Tuple tuple, BasicOutputCollector collector) { // 接收第一个字段的数据 String arg = tuple.getString(0); // 接收第二个字段的数据 Object retInfo = tuple.getValue(1); // 发射数据 collector.emit(new Values(arg + "!!!", retInfo)); } } public static void main(String[] args) {// 拓扑构建器 TopologyBuilder builder = new TopologyBuilder();// 本地分布式RPC LocalDRPC drpc = new LocalDRPC();// 定义一个分布式RPC的Spout,名叫exclamation DRPCSpout spout = new DRPCSpout("exclamation", drpc);// 设置拓扑的Spout,名为drpc builder.setSpout("drpc", spout);// 设置拓扑的Bolt,名为exclaim,接收drpc的数据,并行度是3 builder.setBolt("exclaim", new ExclamationBolt(), 3).shuffleGrouping("drpc");// 设置拓扑的Bolt,名为return,接收exclaim的数据,并行度是3 builder.setBolt("return", new ReturnResults(), 3).shuffleGrouping("exclaim");// 创建本地集群 LocalCluster cluster = new LocalCluster(); Config conf = new Config();// 提交拓扑,该拓扑被命名为exclaim cluster.submitTopology("exclaim", conf, builder.createTopology());// 分布式RPC操作相应的数据,或者说,分布式RPC发送数据给Spout(exclamation) System.out.println(drpc.execute("exclamation", "aaa")); System.out.println(drpc.execute("exclamation", "bbb")); }}
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