本篇内容介绍了“storm的本地模式demo怎么实现”的有关知识,在实际案例的操作过程中,不少人都会遇到这样的困境,接下来就让小编带领大家学习一下如何处理这些情况吧!希望大家仔细阅读,能够学有所成!
SimpleTopology.java
package com.zgl.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(false);
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();
}
}
}
SimpleSpout.java
package com.zgl.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
*
*/
public class SimpleSpout extends BaseRichSpout{
/**
*
*/
private static final long serialVersionUID = 1L;
//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,",
"hujintao\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
*/
@SuppressWarnings("rawtypes")
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
*/
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
*/
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(new Fields("source")); //collector.emit(new Values(msg));参数要对应
}
}
SimpleBolt.java
package com.zgl.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"));
}
}
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>strom-zgl</groupId>
<artifactId>storm-zgl</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>storm-zgl</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.storm</groupId>
<artifactId>storm-core</artifactId>
<version>0.9.1-incubating</version>
</dependency>
</dependencies>
</project>
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