数据采集

package com.jdxia.ack;
import backtype.storm.spout.SpoutOutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.topology.base.BaseRichSpout;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Values;
import java.util.List;
import java.util.Map;
import java.util.UUID;
public class AckSpout extends BaseRichSpout {
    private SpoutOutputCollector collector;
    //初始化方法
    @Override
    public void open(Map conf, TopologyContext context, SpoutOutputCollector collector) {
        this.collector = collector;
    }
    //循环调用,每调用一次就发送一条消息
    @Override
    public void nextTuple() {
        //随机生产一条数据
        String uuid = UUID.randomUUID().toString().replace("_", " ");
        collector.emit(new Values(uuid), new Values(uuid));
        try {
            Thread.sleep(10 * 1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
    //定义发送的字段
    @Override
    public void declareOutputFields(OutputFieldsDeclarer declarer) {
        declarer.declare(new Fields("uuid"));
    }
    @Override
    public void ack(Object msgId) {
        System.out.println("消息处理成功" + msgId);
    }
    @Override
    public void fail(Object msgId) {
        System.out.println("消息处理失败" + msgId);
        //重新发送消息
        collector.emit((List) msgId, msgId);
    }
}

数据处理

package com.jdxia.ack;
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 Bolt1 extends BaseBasicBolt {
    @Override
    public void execute(Tuple input, BasicOutputCollector collector) {
        //输出数据
        collector.emit(new Values(input.getString(0)));
        System.out.println("Bolt1输出消息");
    }
    @Override
    public void declareOutputFields(OutputFieldsDeclarer declarer) {
        declarer.declare(new Fields("uuid"));
    }
}

package com.jdxia.ack;
import backtype.storm.topology.BasicOutputCollector;
import backtype.storm.topology.FailedException;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.topology.base.BaseBasicBolt;
import backtype.storm.tuple.Tuple;
public class Bolt2 extends BaseBasicBolt {
    @Override
    public void execute(Tuple input, BasicOutputCollector collector) {
        //如果需要抛出异常,成功就不要抛出异常
        throw new FailedException("异常");
    }
    @Override
    public void declareOutputFields(OutputFieldsDeclarer declarer) {
    }
}

任务编排

package com.jdxia.ack;
import backtype.storm.Config;
import backtype.storm.LocalCluster;
import backtype.storm.generated.StormTopology;
import backtype.storm.topology.TopologyBuilder;
public class AckTopologyDriver {
    public static void main(String[] args) {
        //1. 准备任务信息
        TopologyBuilder topologyBuilder = new TopologyBuilder();
        topologyBuilder.setSpout("mySpout", new AckSpout(), 1);
        topologyBuilder.setBolt("bolt1", new Bolt1(), 1).shuffleGrouping("mySpout");
        topologyBuilder.setBolt("bolt2", new Bolt2(), 1).shuffleGrouping("bolt1");
        //2. 任务提交
        Config config = new Config();
        StormTopology stormTopology = topologyBuilder.createTopology();
        //本地模式
        LocalCluster localCluster = new LocalCluster();
        localCluster.submitTopology("ack", config, stormTopology);
    }
}