apache storm ExclamationTopology例子

最新推荐文章于 2020-06-11 10:47:09 发布

追寻北极

最新推荐文章于 2020-06-11 10:47:09 发布

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本文链接：https://blog.youkuaiyun.com/joeyon1985/article/details/42965509

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本文介绍了一个使用Apache Storm实现的基本拓扑示例，包括自定义的ExclamationBolt组件，该组件接收输入并添加感叹号作为输出。示例展示了如何通过TopologyBuilder构建拓扑，并配置本地或集群模式运行。

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package storm.starter.util;

import backtype.storm.Config;
import backtype.storm.LocalCluster;
import backtype.storm.generated.StormTopology;

public final class StormRunner {

  private static final int MILLIS_IN_SEC = 1000;

  private StormRunner() {
  }

  public static void runTopologyLocally(StormTopology topology, String topologyName, Config conf, int runtimeInSeconds)
      throws InterruptedException {
    LocalCluster cluster = new LocalCluster();
    cluster.submitTopology(topologyName, conf, topology);
    Thread.sleep((long) runtimeInSeconds * MILLIS_IN_SEC);
    cluster.killTopology(topologyName);
    cluster.shutdown();
  }
}

package storm.starter;

import backtype.storm.Config;
import backtype.storm.LocalCluster;
import backtype.storm.StormSubmitter;
import backtype.storm.task.OutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.testing.TestWordSpout;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.topology.TopologyBuilder;
import backtype.storm.topology.base.BaseRichBolt;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Tuple;
import backtype.storm.tuple.Values;
import backtype.storm.utils.Utils;

import java.util.Map;

/**
 * This is a basic example of a Storm topology.
 */
public class ExclamationTopology {

  public static class ExclamationBolt extends BaseRichBolt {
    OutputCollector _collector;

    @Override
    public void prepare(Map conf, TopologyContext context, OutputCollector collector) {
      _collector = collector;
    }

    @Override
    public void execute(Tuple tuple) {
      _collector.emit(tuple, new Values(tuple.getString(0) + "!!!"));
      _collector.ack(tuple);
    }

    @Override
    public void declareOutputFields(OutputFieldsDeclarer declarer) {
      declarer.declare(new Fields("word"));
    }


  }

  public static void main(String[] args) throws Exception {
    TopologyBuilder builder = new TopologyBuilder();

    builder.setSpout("word", new TestWordSpout(), 10);
    builder.setBolt("exclaim1", new ExclamationBolt(), 3).shuffleGrouping("word");
    builder.setBolt("exclaim2", new ExclamationBolt(), 2).shuffleGrouping("exclaim1");

    Config conf = new Config();
    conf.setDebug(true);

    if (args != null && args.length > 0) {
      conf.setNumWorkers(3);

      StormSubmitter.submitTopology(args[0], conf, builder.createTopology());
    }
    else {

      LocalCluster cluster = new LocalCluster();
      cluster.submitTopology("test", conf, builder.createTopology());
      Utils.sleep(10000);
      cluster.killTopology("test");
      cluster.shutdown();
    }
  }
}