storm实战入门:开发简易Topology实例

时间:2021-11-23 20:33:42

转自:http://www.cnblogs.com/linjiqin/archive/2013/05/28/3104016.html


本节探讨一下storm具体怎么使用,明白怎么在windows下开发storm程序。

功能描述:实时随机输出一字符串。

在开发前记得导入storm需要的jar包。
1、SimpleSpout类继承BaseRichSpout类,用来产生数据并且向topology里面发出消息:tuple。

package com.ljq.helloword;
import java.util.Map;
import java.util.Random;

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;

/**
 * Spout起到和外界沟通的作用,他可以从一个数据库中按照某种规则取数据,也可以从分布式队列中取任务
 * 
 * @author Administrator
 *
 */
@SuppressWarnings("serial")
public class SimpleSpout extends BaseRichSpout{
    //用来发射数据的工具类
    private SpoutOutputCollector collector;
    private static String[] info = new String[]{
        "comaple\t,12424,44w46,654,12424,44w46,654,",
        "lisi\t,435435,6537,12424,44w46,654,",
        "lipeng\t,45735,6757,12424,44w46,654,",
        "*\t,45735,6757,12424,44w46,654,",
        "jiangmin\t,23545,6457,2455,7576,qr44453",
        "beijing\t,435435,6537,12424,44w46,654,",
        "xiaoming\t,46654,8579,w3675,85877,077998,",
        "xiaozhang\t,9789,788,97978,656,345235,09889,",
        "ceo\t,46654,8579,w3675,85877,077998,",
        "cto\t,46654,8579,w3675,85877,077998,",
        "zhansan\t,46654,8579,w3675,85877,077998,"};
    
    Random random=new Random();
    
    /**
     * 初始化collector
     */
    public void open(Map conf, TopologyContext context, SpoutOutputCollector collector) {
        this.collector = collector;
    }
    
    /**
     * 在SpoutTracker类中被调用,每调用一次就可以向storm集群中发射一条数据(一个tuple元组),该方法会被不停的调用
     */
    @Override
    public void nextTuple() {
        try {
            String msg = info[random.nextInt(11)];
            // 调用发射方法
            collector.emit(new Values(msg));
            // 模拟等待100ms
            Thread.sleep(100);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    /**
     * 定义字段id,该id在简单模式下没有用处,但在按照字段分组的模式下有很大的用处。
     * 该declarer变量有很大作用,我们还可以调用declarer.declareStream();来定义stramId,该id可以用来定义更加复杂的流拓扑结构
     */
    @Override
    public void declareOutputFields(OutputFieldsDeclarer declarer) {
        declarer.declare(new Fields("source")); //collector.emit(new Values(msg));参数要对应
    }

}


2、SimpleBolt类继承BaseBasicBolt类,处理一个输入tuple。

package com.ljq.helloword;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;/** * 接收喷发节点(Spout)发送的数据进行简单的处理后,发射出去。 *  * @author Administrator *  */@SuppressWarnings("serial")public class SimpleBolt extends BaseBasicBolt {    public void execute(Tuple input, BasicOutputCollector collector) {        try {            String msg = input.getString(0);            if (msg != null){                //System.out.println("msg="+msg);                collector.emit(new Values(msg + "msg is processed!"));            }                        } catch (Exception e) {            e.printStackTrace();         }    }    public void declareOutputFields(OutputFieldsDeclarer declarer) {        declarer.declare(new Fields("info"));    }}

3、SimpleTopology类包含一个main函数,是Storm程序执行的入口点,包括一个数据喷发节点spout和一个数据处理节点bolt。

package com.ljq.helloword;import backtype.storm.Config;import backtype.storm.LocalCluster;import backtype.storm.StormSubmitter;import backtype.storm.topology.TopologyBuilder;/** * 定义了一个简单的topology,包括一个数据喷发节点spout和一个数据处理节点bolt。 *  * @author Administrator * */public class SimpleTopology {    public static void main(String[] args) {        try {            // 实例化TopologyBuilder类。            TopologyBuilder topologyBuilder = new TopologyBuilder();            // 设置喷发节点并分配并发数,该并发数将会控制该对象在集群中的线程数。            topologyBuilder.setSpout("SimpleSpout", new SimpleSpout(), 1);            // 设置数据处理节点并分配并发数。指定该节点接收喷发节点的策略为随机方式。            topologyBuilder.setBolt("SimpleBolt", new SimpleBolt(), 3).shuffleGrouping("SimpleSpout");            Config config = new Config();            config.setDebug(true);            if (args != null && args.length > 0) {                config.setNumWorkers(1);                StormSubmitter.submitTopology(args[0], config, topologyBuilder.createTopology());            } else {                // 这里是本地模式下运行的启动代码。                config.setMaxTaskParallelism(1);                LocalCluster cluster = new LocalCluster();                cluster.submitTopology("simple", config, topologyBuilder.createTopology());            }                    } catch (Exception e) {            e.printStackTrace();         }    }}


运行结果效果如下:

storm实战入门:开发简易Topology实例