strom 官方DRPC

storm 官方DRPC

package drpc;import backtype.storm.Config;import backtype.storm.LocalCluster;import backtype.storm.LocalDRPC;import backtype.storm.StormSubmitter;import backtype.storm.drpc.LinearDRPCTopologyBuilder;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;/** * This topology is a basic example of doing distributed RPC on top of Storm. It implements a function that appends a * "!" to any string you send the DRPC function. * <p/> * See https://github.com/nathanmarz/storm/wiki/Distributed-RPC for more information on doing distributed RPC on top of * Storm. */public class BasicDRPCTopology {  public static class ExclaimBolt extends BaseBasicBolt {    @Override    public void execute(Tuple tuple, BasicOutputCollector collector) {      String input = tuple.getString(1);      collector.emit(new Values(tuple.getValue(0), input + "!"));    }    @Override    public void declareOutputFields(OutputFieldsDeclarer declarer) {      declarer.declare(new Fields("id", "result"));    }  }  public static void main(String[] args) throws Exception {    LinearDRPCTopologyBuilder builder = new LinearDRPCTopologyBuilder("exclamation");    builder.addBolt(new ExclaimBolt(), 3);    Config conf = new Config();    if (args == null || args.length == 0) {      LocalDRPC drpc = new LocalDRPC();      LocalCluster cluster = new LocalCluster();      cluster.submitTopology("drpc-demo", conf, builder.createLocalTopology(drpc));      //客户端代码      for (String word : new String[]{ "hello", "goodbye" }) {        System.err.println("Result for \"" + word + "\": " + drpc.execute("exclamation", word));      }//      cluster.shutdown();//      drpc.shutdown();    }    else {      conf.setNumWorkers(3);      StormSubmitter.submitTopology(args[0], conf, builder.createRemoteTopology());    }  }}

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