storm drpc怎么定义
本篇内容介绍了“storm drpc怎么定义”的有关知识,在实际案例的操作过程中,不少人都会遇到这样的困境,接下来就让小编带领大家学习一下如何处理这些情况吧!希望大家仔细阅读,能够学有所成!
代码:
package main.java;import main.java.bolt.RequestCounter;import backtype.storm.Config;import backtype.storm.LocalCluster;import backtype.storm.LocalDRPC;import backtype.storm.StormSubmitter;import backtype.storm.drpc.LinearDRPCTopologyBuilder;import backtype.storm.utils.DRPCClient;/** * DRPC example * * @author sjyu * */public class DRPCTopologyMain {public static void main(String[] args) throws Exception {//LocalDRPC drpc = new LocalDRPC();DRPCClient drpc = new DRPCClient(“192.168.1.240”, 3772);LinearDRPCTopologyBuilder builder = new LinearDRPCTopologyBuilder(“test_func”);builder.addBolt(new RequestCounter(), 2);Config conf = new Config();conf.setDebug(true);StormSubmitter.submitTopology(“drpc_test”, conf, builder.createRemoteTopology());//LocalCluster cluster = new LocalCluster();//cluster.submitTopology(“local_cluster”, conf, builder.createLocalTopology(drpc));String str = drpc.execute(“test_func”, “this is a test”);//这边drpc的client和server写在一起了,不知道可不可以写在两个进程里,//想像中应该没问题,就像网络编程一样,但是行不行还有待验证。System.out.println(str);}}package main.java.bolt;import backtype.storm.topology.BasicOutputCollector;import backtype.storm.topology.OutputFieldsDeclarer;import backtype.storm.topology.base.BaseBasicBolt;import backtype.storm.tuple.Fields;import backtype.storm.tuple.Tuple;import backtype.storm.tuple.Values;public class RequestCounter extends BaseBasicBolt {//Object id = new Object();这边好像不能定义一个变量,不然就报错,// 不知道是storm的原因还是java本来就不能这样(我觉得我似乎要去学学java了- -) @Overridepublic void execute(Tuple input, BasicOutputCollector collector) {String str = (String) input.getString(1);collector.emit(new Values(input.getValue(0), str));}@Overridepublic void declareOutputFields(OutputFieldsDeclarer declarer) {declarer.declare(new Fields(“id”,”result”));}}
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