这篇文章主要介绍“storm启动类怎么定义”，在日常操作中，相信很多人在storm启动类怎么定义问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”storm启动类怎么定义”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！
在storm集群中真正运行Topology的主要有三个实例:工作进程丶线程和任务.
Storm集群中的每台机器上都可以运行多个工作进程,每个工作进程又可以创建多个线程,每个线程可以执行多个任务.
Storm可靠性:是通过对消息树给定一个唯一的ID,每送一个消息,都会同步发送一个ack或fail,对于网络的宽带会有一定的消耗,如果对于可靠性要求不高,可以通过使用不同的emit接口关闭该模式.
一、storm启动类的定义。
package com.cmsz.storm.trading.test;
import backtype.storm.topology.TopologyBuilder;
import backtype.storm.tuple.Fields;
public class MainStorm {
public static void main(String[] args) throws Exception {
TopologyBuilder builder = new TopologyBuilder();
builder.setSpout("A", new ASpout());
builder.setBolt("B", new BBolt()).shuffleGrouping("A", "streamId_B");//componentId和streamId
builder.setBolt("C", new CBolt()).shuffleGrouping("A", "streamId_C");//componentId和streamId
builder.setBolt("D", new DBolt()).fieldsGrouping("B", new Fields("id"));//componentId和streamId
builder.setBolt("E", new EBolt()).fieldsGrouping("C", new Fields("id"));
Config conf = new Config();
if (args != null && args.length > 0) {
conf.setNumWorkers(1);
StormSubmitter.submitTopology(args[0], conf, builder.createTopology());
} else {
LocalCluster cluster = new LocalCluster();
cluster.submitTopology("myTopo", conf, builder.createTopology());
}
}
}二、spout定义了streamId，接受的bolt要定义componentId与spout中定义的streamId("streamId_B"、"streamId_C")对应定义去接收，fiedsGrouping的new Fields("id")中的id要和componentId的对应bolt中new Fields("id","message")中的"id"对应就会以"id"进行分组
package com.cmsz.storm.trading.test;
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;
import backtype.storm.utils.Utils;
public class ASpout extends BaseRichSpout{
SpoutOutputCollector collector;
@Override
public void open(Map conf, TopologyContext context, SpoutOutputCollector collector) {
this.collector = collector;
}
@Override
public void nextTuple() {
Utils.sleep(10);
final String[] words = new String[] {"B_nathan", "C_mike", "B_jackson", "C_golda", "B_bertels"};
final Random rand = new Random();
final String word = words[rand.nextInt(words.length)];
if(word.indexOf("B_")>-1){
collector.emit("streamId_B",new Values(word));
}else if(word.indexOf("C_")>-1){
collector.emit("streamId_C",new Values(word));
}
}
@Override
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declareStream("streamId_B", new Fields("streamId_B"));
declarer.declareStream("streamId_C", new Fields("streamId_C"));
}
@Override
public void ack(Object msgId) {
super.ack(msgId);
}
@Override
public void fail(Object msgId) {
super.fail(msgId);
}
}package com.cmsz.storm.trading.test;
import java.util.Map;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.BasicOutputCollector;
import backtype.storm.topology.IBasicBolt;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Tuple;
import backtype.storm.tuple.Values;
public class BBolt implements IBasicBolt {
@Override
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(new Fields("id","message"));
}
@Override
public Map<String, Object> getComponentConfiguration() {
return null;
}
@Override
public void prepare(Map stormConf, TopologyContext context) {
}
@Override
public void execute(Tuple input, BasicOutputCollector collector) {
String msg = input.getString(0);
System.out.println(msg);
collector.emit(new Values(msg,msg+"BBolt"));
}
@Override
public void cleanup() {
}
}package com.cmsz.storm.trading.test;
import java.util.Map;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.BasicOutputCollector;
import backtype.storm.topology.IBasicBolt;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Tuple;
import backtype.storm.tuple.Values;
public class CBolt implements IBasicBolt {
@Override
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(new Fields("id","message"));
}
@Override
public Map<String, Object> getComponentConfiguration() {
return null;
}
@Override
public void prepare(Map stormConf, TopologyContext context) {
}
@Override
public void execute(Tuple input, BasicOutputCollector collector) {
String msg = input.getString(0);
System.out.println(msg);
collector.emit(new Values(msg,msg+"CBolt"));
}
@Override
public void cleanup() {
}
}package com.cmsz.storm.trading.test;
import java.util.Map;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.BasicOutputCollector;
import backtype.storm.topology.IBasicBolt;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Tuple;
public class DBolt implements IBasicBolt {
@Override
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(new Fields("message"));
}
@Override
public Map<String, Object> getComponentConfiguration() {
return null;
}
@Override
public void prepare(Map stormConf, TopologyContext context) {
}
@Override
public void execute(Tuple input, BasicOutputCollector collector) {
System.out.println("DBolt"+input.getString(0));
}
@Override
public void cleanup() {
}
}package com.cmsz.storm.trading.test;
import java.util.Map;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.BasicOutputCollector;
import backtype.storm.topology.IBasicBolt;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Tuple;
public class EBolt implements IBasicBolt {
@Override
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(new Fields("message"));
}
@Override
public Map<String, Object> getComponentConfiguration() {
return null;
}
@Override
public void prepare(Map stormConf, TopologyContext context) {
}
@Override
public void execute(Tuple input, BasicOutputCollector collector) {
System.out.println("EBolt"+input.getString(0));
}
@Override
public void cleanup() {
}
}到此，关于“storm启动类怎么定义”的学习就结束了，希望能够解决大家的疑惑。理论与实践的搭配能更好的帮助大家学习，快去试试吧！若想继续学习更多相关知识，请继续关注亿速云网站，小编会继续努力为大家带来更多实用的文章！
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