Storm的 hello 输出流

Spout  (随机生成随机数)-----------------------》Ecclamation（加感叹号）  -----> print（加问候语）

   

TestWordSpout

package cn.ljh.storm.helloworld;

import org.apache.storm.topology.OutputFieldsDeclarer;
import java.util.Map;
import org.apache.storm.spout.SpoutOutputCollector;
import org.apache.storm.task.TopologyContext;
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;
import java.util.Random;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


public class TestWordSpout extends BaseRichSpout {
    public static Logger LOG = LoggerFactory.getLogger(TestWordSpout.class);
    SpoutOutputCollector _collector;

    public void open(Map conf, TopologyContext context, SpoutOutputCollector collector) {
        _collector = collector;
    }

    public void nextTuple() {
        Utils.sleep(100);
        final String[] words = new String[] {"nathan", "mike", "jackson", "golda", "bertels"};
        final Random rand = new Random();
        final String word = words[rand.nextInt(words.length)];
        _collector.emit(new Values(word));
    }

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

ExclamationBolt

package cn.ljh.storm.helloworld;

import java.util.Map;

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.Fields;
import org.apache.storm.tuple.Tuple;
import org.apache.storm.tuple.Values;

public class ExclamationBolt extends BaseRichBolt {
    OutputCollector _collector;

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

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

    public void declareOutputFields(OutputFieldsDeclarer declarer) {
        declarer.declare(new Fields("word"));                            //指定名称
    }

}

printBolt

package cn.ljh.storm.helloworld;

import java.util.Map;

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 org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class PrintBolt extends BaseRichBolt {
    private static Logger LOG = LoggerFactory.getLogger(PrintBolt.class);
    OutputCollector _collector;

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

    public void execute(Tuple tuple) {
        LOG.info(tuple.getString(0) + " Hello World!");
        _collector.ack(tuple);
    }

    public void declareOutputFields(OutputFieldsDeclarer declarer) {          //不再下发
    }
}

ExclamationTopology

package cn.ljh.storm.helloworld;

import org.apache.storm.Config;
import org.apache.storm.LocalCluster;
import org.apache.storm.StormSubmitter;
import org.apache.storm.topology.TopologyBuilder;
import org.apache.storm.utils.Utils;

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

        builder.setSpout("word", new TestWordSpout(), 1);          //指定消息ID 为word
        builder.setBolt("exclaim", new ExclamationBolt(), 1).shuffleGrouping("word");   //指定分发策略，由spout（wordID）进行下发 
        builder.setBolt("print", new PrintBolt(), 1).shuffleGrouping("exclaim");        //指定分组策略

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

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

            StormSubmitter.submitTopologyWithProgressBar(args[0], conf, builder.createTopology());         //随机NAME
        }
        else {

            LocalCluster cluster = new LocalCluster();
            cluster.submitTopology("test3", conf, builder.createTopology());
            Utils.sleep(20000);
            cluster.killTopology("test3");
            cluster.shutdown();
        }
    }
}