storm自带例子详解 （三）——ExclamationTopology

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package storm.starter;

import backtype.storm.Config;
import backtype.storm.LocalCluster;
import backtype.storm.StormSubmitter;
import backtype.storm.task.OutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.testing.TestWordSpout;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.topology.TopologyBuilder;
import backtype.storm.topology.base.BaseRichBolt;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Tuple;
import backtype.storm.tuple.Values;
import backtype.storm.utils.Utils;

import java.util.Map;

/**
* This is a basic example of a Storm topology.
*/

/*
** 一个基础的拓扑
*/
public class ExclamationTopology {

// 定义一个Bolt，继承自BaseRichBolt
public static class ExclamationBolt extends BaseRichBolt {
// 输出收集器
OutputCollector _collector;

// 准备函数
@Override
public void prepare(Map conf, TopologyContext context, OutputCollector collector) {
_collector = collector;
}

// 执行函数
@Override
public void execute(Tuple tuple) {
// 先接收一个单词，然后在他后面加上!!!，然后发送出去
_collector.emit(tuple, new Values(tuple.getString(0) + "!!!"));
// 确认发送，保证了准确性
_collector.ack(tuple);
}

// 输出字段定义函数
@Override
public void declareOutputFields(OutputFieldsDeclarer declarer) {
// 定义一个字段word
declarer.declare(new Fields("word"));
}

}

public static void main(String[] args) throws Exception {
// 创建一个拓扑构建器
TopologyBuilder builder = new TopologyBuilder();

// 设置Spout，该Spout的名字是word，并行度是10
builder.setSpout("word", new TestWordSpout(), 10);
// 设置Bolt，该Bolt的名字是exclaim1，并行度是3，它的上游是Spout（word）（即，接收名为word的Bolt的数据）
builder.setBolt("exclaim1", new ExclamationBolt(), 3).shuffleGrouping("word");
// 设置Bolt，该Bolt的名字是exclaim2，并行度是2，它的上游是Bolt（exclaim1）（即，接收名为exclaim2的Bolt的数据）
builder.setBolt("exclaim2", new ExclamationBolt(), 2).shuffleGrouping("exclaim1");

Config conf = new Config();
// 设置为debug模式
conf.setDebug(true);

if (args != null && args.length > 0) {
// 集群模式

// 设置工作进程的数量为3
conf.setNumWorkers(3);
// 提交拓扑
StormSubmitter.submitTopologyWithProgressBar(args[0], conf, builder.createTopology());
}
else {

// 本地模式

// 构建一个本地集群
LocalCluster cluster = new LocalCluster();
// 提交一个名为test的拓扑
cluster.submitTopology("test", conf, builder.createTopology());
// 睡眠一段时间
Utils.sleep(10000);
// 杀死拓扑
cluster.killTopology("test");
cluster.shutdown();
}
}
}