Storm流之FieldGrouping字段分组

一、      需求

            字符串按照是否包含o分组

二、      Topology

package com.test.csdn;
import com.test.storm.bolt.FieldPrintBolt;
import com.test.storm.spout.SplitTestSpout;
import org.apache.storm.Config;
import org.apache.storm.LocalCluster;
import org.apache.storm.topology.TopologyBuilder;
import org.apache.storm.tuple.Fields;
import org.apache.storm.utils.Utils;

/**
 * Created by Simon on 2018/4/26.
 */
public class FiledGroupingTopo {
    public static void main(String[] args) {

        TopologyBuilder builder = new TopologyBuilder();

        builder.setSpout("spout", new FiledGroupingSpout(), 1);
        //指定5个，便于测试
        builder.setBolt("bolt", new FiledGroupingBolt(), 5).fieldsGrouping("spout", new Fields("isContainsO"));

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

        LocalCluster cluster = new LocalCluster();
        cluster.submitTopology("toplogy", conf, builder.createTopology());
        Utils.sleep(Long.MAX_VALUE);
        cluster.shutdown();

    }
}

三、      Spout

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 2018/4/26.
 */
public class FiledGroupingSpout extends BaseRichSpout{
    private SpoutOutputCollector collector;
    String[] str =  {"xiaomi","huawei","apple","oppo","vivo","lenovo","LG",
            "samsung","htc","honor","nokia","smartisan","Sony","BlackBerry","sharp"};

    @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(15);
            String string = str[i];
            //按照是否有o分组
            boolean o = string.contains("o");
            collector.emit(new Values(o,string));
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

    }

    @Override
    public void declareOutputFields(OutputFieldsDeclarer outputFieldsDeclarer) {
        outputFieldsDeclarer.declare(new Fields("isContainsO","string"));
    }
}

四、      Bolt

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 2018/4/26.
 */
public class FiledGroupingBolt extends BaseBasicBolt{

    @Override
    public void execute(Tuple tuple, BasicOutputCollector basicOutputCollector) {
        System.out.println(Thread.currentThread().getName()+"___"+tuple.getValue(1));
    }

    @Override
    public void declareOutputFields(OutputFieldsDeclarer outputFieldsDeclarer) {

    }
}

五、      输出结果