storm定时器

package com.example.mail;

import org.apache.storm.Config;
import org.apache.storm.LocalCluster;
import org.apache.storm.topology.TopologyBuilder;

public class Main {
  public static void main(String[] args) {
    // 组装topology
    TopologyBuilder topologyBuilder = new TopologyBuilder();
    topologyBuilder.setSpout("spout1", new MySpout());
    // .shuffleGrouping("spout1"); 表示让MyBolt接收MySpout发射出来的tuple
    topologyBuilder.setBolt("bolt1", new EmailBolt()).shuffleGrouping("spout1");

    // 创建本地storm集群
    LocalCluster localCluster = new LocalCluster();
    Config config = new Config();

    localCluster.submitTopology("sumTopology", config, topologyBuilder.createTopology());
  }
}

package com.example.mail;

import java.util.Map;

import org.apache.storm.spout.SpoutOutputCollector;
import org.apache.storm.task.TopologyContext;
import org.apache.storm.topology.OutputFieldsDeclarer;
import org.apache.storm.topology.base.BaseRichSpout;
import org.apache.storm.tuple.Fields;
import org.apache.storm.tuple.Values;
import org.apache.storm.utils.Utils;

public class MySpout extends BaseRichSpout {
  private Map conf;
  private TopologyContext context;
  private SpoutOutputCollector collector;

  /**
   * 初始化方法，只会执行一次
   * 在这里面可以写一个初始化的代码
   * Map conf：其实里面保存的是topology的一些配置信息
   * TopologyContext context：topology的上下文，类似于servletcontext
   * SpoutOutputCollector collector：发射器，负责向外发射数据(tuple)
   */
  @Override
  public void open(Map conf, TopologyContext context,
          SpoutOutputCollector collector) {
      this.conf = conf;
      this.context = context;
      this.collector = collector;
  }

  int num = 1;
  /**
   * 这个方法是spout中最重要的方法，
   * 这个方法会被storm框架循环调用，可以理解为这个方法是在一个while循环之内
   * 每调用一次，会向外发射一条数据
   */
  @Override
  public void nextTuple() {
      System.out.println("spout发射："+num);
      //把数据封装到values中，称为一个tuple，发射出去
      this.collector.emit(new Values(num++));
      Utils.sleep(1000);
  }

  /**
   * 声明输出字段
   */
  @Override
  public void declareOutputFields(OutputFieldsDeclarer declarer) {
      //给values中的数据起个名字，方便后面的bolt从这个values中取数据
      //fields中定义的参数和values中传递的数值是一一对应的
      declarer.declare(new Fields("num"));
  }
}

package com.example.mail;

import java.util.HashMap;
import java.util.Map;

import org.apache.storm.Config;
import org.apache.storm.Constants;
import org.apache.storm.task.OutputCollector;
import org.apache.storm.task.TopologyContext;
import org.apache.storm.topology.OutputFieldsDeclarer;
import org.apache.storm.topology.base.BaseRichBolt;
import org.apache.storm.tuple.Tuple;

import lombok.extern.slf4j.Slf4j;

@Slf4j
public class EmailBolt extends BaseRichBolt {

  private transient OutputCollector collector;

  @Override
  public void prepare(Map stormConf, TopologyContext context, OutputCollector collector) {
    this.collector = collector;
  }

  @Override
  public void execute(Tuple input) {
    System.out.println(input.getSourceComponent());
    System.out.println(input.getSourceStreamId());
    if (input.getSourceComponent().equals(Constants.SYSTEM_COMPONENT_ID)
        && input.getSourceStreamId().equals(Constants.SYSTEM_TICK_STREAM_ID)) {
      System.out.println("定时任务执行了。");

    }
  }

  @Override
  public Map<String, Object> getComponentConfiguration() {
    HashMap<String, Object> hashMap = new HashMap<>();
    hashMap.put(Config.TOPOLOGY_TICK_TUPLE_FREQ_SECS, 10);
    return hashMap;
  }

  @Override
  public void declareOutputFields(OutputFieldsDeclarer declarer) {
    // last bolt in flow, no further processing
  }

}

23616 [Thread-24-__system-executor[-1 -1]] INFO o.a.s.d.executor - Preparing bolt __system:(-1)
23629 [Thread-24-__system-executor[-1 -1]] INFO o.a.s.d.executor - Prepared bolt __system:(-1)
23633 [Thread-20-spout1-executor[3 3]] INFO o.a.s.d.executor - Opening spout spout1:(3)
23637 [Thread-20-spout1-executor[3 3]] INFO o.a.s.d.executor - Opened spout spout1:(3)
23642 [Thread-20-spout1-executor[3 3]] INFO o.a.s.d.executor - Activating spout spout1:(3)
spout发射：1
23670 [Thread-22-__acker-executor[1 1]] INFO o.a.s.d.executor - Preparing bolt __acker:(1)
23673 [Thread-22-__acker-executor[1 1]] INFO o.a.s.d.executor - Prepared bolt __acker:(1)
23694 [Thread-18-bolt1-executor[2 2]] INFO o.a.s.d.executor - Preparing bolt bolt1:(2)
23696 [Thread-18-bolt1-executor[2 2]] INFO o.a.s.d.executor - Prepared bolt bolt1:(2)
spout1
default
spout发射：2
spout1
default
spout发射：3
spout1
default
spout发射：4
spout1
default
spout发射：5
spout1
default
spout发射：6
spout1
default
spout发射：7
spout1
default
spout发射：8
spout1
default
spout发射：9
spout1
default
spout发射：10
spout1
default
spout发射：11
spout1
default
__system
__tick
定时任务执行了。
spout发射：12
spout1
default
spout发射：13
spout1
default
spout发射：14
spout1
default
spout发射：15
spout1
default
spout发射：16
spout1
default
spout发射：17
spout1
default
spout发射：18
spout1
default
spout发射：19
spout1
default
spout发射：20
spout1
default
__system
__tick
定时任务执行了。