8.3.0Storm流之一个Spout分发多个Bolt

Storm流之一个Spout分发多个Bolt

一、案例Demo

        Spout中生成若干数字。

            大于0，小于100    的数字分发到MinBolt

            大于100，小于200的数字分发到MidBolt

            大于200                的数字分发到MaxBolt

二、FenFaTopology代码

package com.test.csdn;

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

/**
 * Created by Simon on 2018/4/19.
 */
public class FenFaTopology {
    public static void main(String[] args) {
        TopologyBuilder builder = new TopologyBuilder();
        builder.setSpout("fenFaSpout",new FenFaSpout());
        builder.setBolt("minBolt",new MinBolt()).localOrShuffleGrouping("fenFaSpout","min");
        builder.setBolt("midBolt",new MidBolt()).localOrShuffleGrouping("fenFaSpout","mid");
        builder.setBolt("maxBolt",new MaxBolt()).localOrShuffleGrouping("fenFaSpout","max");
        Config config = new Config();
        try {
            LocalCluster cluster = new LocalCluster();
           cluster.submitTopology(FenFaTopology.class.getSimpleName(), config, builder.createTopology());
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}

三、FenFaSpout代码

package com.test.csdn;

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 java.util.Map;
import java.util.Random;

/**
 * Created by Simon on 2018/4/19.
 * 生成数据
 * 将大于0   小于100 的分发给MinBolt
 * 将大于100 小于200 的分发给MidBolt
 * 将大于200        的分发给MaxBolt
 */
public class FenFaSpout extends BaseRichSpout{
    int [] arr = {123,22,45,56,235,2,118,4,5,7,45,153,187,360,288,580,12,521,121,111};
    private  SpoutOutputCollector collector;

    @Override
    public void open(Map map, TopologyContext topologyContext, SpoutOutputCollector spoutOutputCollector) {
       this.collector = spoutOutputCollector;
    }

    @Override
    public void nextTuple() {
        try {
            Thread.sleep(1000);
            int i = new Random().nextInt(20);
            if(arr[i] >= 0 && arr[i] <= 100){
                collector.emit("min",new Values(arr[i]));
            }else if(arr[i] > 100 && arr[i] <= 200){
                collector.emit("mid",new Values(arr[i]));
            }else{
                collector.emit("max",new Values(arr[i]));
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        
    }

    @Override
    public void declareOutputFields(OutputFieldsDeclarer outputFieldsDeclarer) {
        outputFieldsDeclarer.declareStream("min",new Fields("value"));
        outputFieldsDeclarer.declareStream("mid",new Fields("value"));
        outputFieldsDeclarer.declareStream("max",new Fields("value"));
    }
}

四、MinBolt代码

package com.test.csdn;

import org.apache.storm.topology.BasicOutputCollector;
import org.apache.storm.topology.OutputFieldsDeclarer;
import org.apache.storm.topology.base.BaseBasicBolt;
import org.apache.storm.tuple.Tuple;

/**
 * Created by Simon on 2018/4/19.
 */
public class MinBolt  extends BaseBasicBolt{
    @Override
    public void execute(Tuple tuple, BasicOutputCollector basicOutputCollector) {
        Integer i = tuple.getInteger(0);
        System.out.println("MinBolt得到的值:"+i);

    }

    @Override
    public void declareOutputFields(OutputFieldsDeclarer outputFieldsDeclarer) {

    }
} 

五、MidBolt代码

package com.test.csdn;

import org.apache.storm.topology.BasicOutputCollector;
import org.apache.storm.topology.OutputFieldsDeclarer;
import org.apache.storm.topology.base.BaseBasicBolt;
import org.apache.storm.tuple.Tuple;

/**
 * Created by Simon on 2018/4/19.
 */
public class MidBolt extends BaseBasicBolt{
    @Override
    public void execute(Tuple tuple, BasicOutputCollector basicOutputCollector) {
        Integer i = tuple.getInteger(0);
        System.out.println("MidBolt得到的值:"+i);
    }

    @Override
    public void declareOutputFields(OutputFieldsDeclarer outputFieldsDeclarer) {

    }
}

六、MaxBolt代码

package com.test.csdn;

import org.apache.storm.topology.BasicOutputCollector;
import org.apache.storm.topology.OutputFieldsDeclarer;
import org.apache.storm.topology.base.BaseBasicBolt;
import org.apache.storm.tuple.Tuple;

/**
 * Created by Simon on 2018/4/19.
 */
public class MaxBolt extends BaseBasicBolt{
    @Override
    public void execute(Tuple tuple, BasicOutputCollector basicOutputCollector) {
        Integer i = tuple.getInteger(0);
        System.out.println("MaxBolt得到的值:"+i);
    }

    @Override
    public void declareOutputFields(OutputFieldsDeclarer outputFieldsDeclarer) {

    }
}

七、运行结果

MaxBolt得到的值:235
MidBolt得到的值:118
MinBolt得到的值:22
MinBolt得到的值:56
MinBolt得到的值:56
MinBolt得到的值:45
MidBolt得到的值:118
MinBolt得到的值:4
MinBolt得到的值:22
MinBolt得到的值:56
MaxBolt得到的值:580
MidBolt得到的值:118
MidBolt得到的值:118
MaxBolt得到的值:580
MinBolt得到的值:5
MidBolt得到的值:153
MidBolt得到的值:187
MinBolt得到的值:45
MidBolt得到的值:153