在Apache Storm中定義拓?fù)涫峭ㄟ^編寫Java代碼來實現(xiàn)的。以下是一個簡單示例:
import org.apache.storm.Config;
import org.apache.storm.LocalCluster;
import org.apache.storm.StormSubmitter;
import org.apache.storm.generated.StormTopology;
import org.apache.storm.topology.TopologyBuilder;
public class MyTopology {
public static void main(String[] args) throws Exception {
TopologyBuilder builder = new TopologyBuilder();
// 定義spout和bolt
builder.setSpout("mySpout", new MySpout());
builder.setBolt("myBolt", new MyBolt()).shuffleGrouping("mySpout");
// 創(chuàng)建配置
Config config = new Config();
config.setDebug(true);
// 創(chuàng)建拓?fù)?/span>
StormTopology topology = builder.createTopology();
// 提交拓?fù)?/span>
if (args != null && args.length > 0) {
StormSubmitter.submitTopology(args[0], config, topology);
} else {
LocalCluster cluster = new LocalCluster();
cluster.submitTopology("myTopology", config, topology);
Thread.sleep(10000);
cluster.shutdown();
}
}
}
在這個示例中,我們定義了一個名為"MyTopology"的拓?fù)洌ㄒ粋€Spout和一個Bolt。我們使用TopologyBuilder來定義拓?fù)浣Y(jié)構(gòu),并創(chuàng)建一個Config對象來配置拓?fù)?。最后,我們使用StormSubmitter類來提交拓?fù)涞絊torm集群中運行,或者使用LocalCluster類在本地運行拓?fù)洹?/p>
你可以根據(jù)自己的需求修改和擴(kuò)展這個示例來定義更復(fù)雜的拓?fù)浣Y(jié)構(gòu)。更多關(guān)于如何在Storm中定義拓?fù)涞男畔?,請參考官方文檔:http://storm.apache.org/releases/current/Understanding-the-parallelism-of-a-Storm-topology.html.