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: