javaAPI实现创建zookeeper服务端

最新推荐文章于 2024-06-27 13:31:06 发布

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本文介绍了一个基于ZooKeeper实现的简单分布式服务器注册与发现机制。通过创建临时有序节点来标识在线服务器，并监听节点变化以获取集群内成员变动。

package cn.smart.bigdata.zkdist;

import java.io.IOException;

import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.ZooKeeper;

public class DistributedServer {

	private static final String connectString = "192.168.25.121:2181,192.168.25.122:2181,192.168.25.124:2181";
	private static final int sessionTimeout = 30000;
	private ZooKeeper zk = null;
	private static final String parentNode = "/servers";
	
	public void getConnect() throws Exception {
		zk = new ZooKeeper(connectString, sessionTimeout, new Watcher() {
			@Override
			public void process(WatchedEvent event) {
				// 收到事件通知后的回调函数（应该是我们自己的事件处理逻辑）
				System.out.println(event.getType() + "---" + event.getPath());
				try {
					zk.getChildren("/", true);
				} catch (Exception e) {
				}
			}
		});
	}
	
	public void registerServer(String hostname) throws Exception, Exception{
		String create = zk.create(parentNode+"/server", hostname.getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL_SEQUENTIAL);
		System.out.println(hostname + "is online...." + create);
	}
	
	public void handleBusiness(String hostname) throws Exception{
		System.out.println(hostname + "is working...");
		Thread.sleep(Long.MAX_VALUE);
	}
	
	public static void main(String[] args) throws Exception {
		//获取zk连接
		DistributedServer server = new DistributedServer();
		server.getConnect();
		//利用zk连接注册服务器信息
		server.registerServer(args[0]);
		//启动业务功能
		server.handleBusiness(args[0]);
	}
}