zookeeper服务器动态上下线代码怎么写
今天就跟大家聊聊有关zookeeper服务器动态上下线代码怎么写,可能很多人都不太了解,为了让大家更加了解,小编给大家总结了以下内容,希望大家根据这篇文章可以有所收获。
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服务端: package com.hgs.test; import java.io.IOException; import java.util.List; import org.apache.zookeeper.CreateMode; import org.apache.zookeeper.KeeperException; import org.apache.zookeeper.WatchedEvent; import org.apache.zookeeper.Watcher; import org.apache.zookeeper.Watcher.Event.EventType; import org.apache.zookeeper.ZooDefs.Ids; import org.apache.zookeeper.ZooKeeper; public class ZKserver { private ZooKeeper zk = null; private final static String connectString = "192.168.6.131:2181,192.168.6.132:2181,192.168.6.133:2181"; private final static int sessionTimeout = 2000; private final static String parentNode="/servers"; public static void main(String[] args) { ZKserver zkserver = new ZKserver(); zkserver.getConnect(); zkserver.register(args[0]); zkserver.doSomthing(); } public void getConnect() { try { zk = new ZooKeeper(connectString, sessionTimeout, new Watcher() { @Override public void process(WatchedEvent event) { try { if (zk.exists(parentNode,false)==null) { System.out.println(zk.getChildren("/", true)); }else { if(event.getType()==EventType.NodeChildrenChanged) { try { System.out.println(zk.getChildren(parentNode, true)+ event.getType().toString()+" "+(event.getType()==EventType.NodeChildrenChanged)); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } } } catch (Exception e2) { // TODO Auto-generated catch block e2.printStackTrace(); } } }); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public void register(String host) { try { if(zk.exists(parentNode,false)==null ) { zk.create(parentNode, null, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT); } zk.create(parentNode+"/server", host.getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL_SEQUENTIAL); } catch (Exception e) { // TODO Auto-generated catch block System.out.println("register sever failed !"); System.exit(1); } } public void doSomthing() { System.out.println("doSomething......"); try { Thread.sleep(Long.MAX_VALUE); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } 服务端: package com.hgs.test; import java.io.IOException; import java.util.ArrayList; import java.util.List; import org.apache.zookeeper.KeeperException; import org.apache.zookeeper.WatchedEvent; import org.apache.zookeeper.Watcher; import org.apache.zookeeper.ZooKeeper; import org.apache.zookeeper.data.Stat; public class ZKclient { private ZooKeeper zk = null; private final static String connectString = "192.168.6.131:2181,192.168.6.132:2181,192.168.6.133:2181"; private final static int sessionTimeout = 2000; private volatile ListserverList = new ArrayList (); private final static String parentNode="/servers"; int i = 10; public static void main(String[] args) { ZKclient client = new ZKclient(); client.getConnect(); client.getServerList(); client.doSomething(); } public void getConnect() { try { zk = new ZooKeeper(connectString, sessionTimeout, new Watcher(){ @Override public void process(WatchedEvent event) { try { Stat st = zk.exists(parentNode, true); //System.out.println(st); if(st!=null) { getServerList(); }else { zk.getChildren("/", true); } } catch (KeeperException | InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public void getServerList() { List ls = new ArrayList (); try { Stat st = zk.exists(parentNode, true); if(st!=null) { for(String str:zk.getChildren(parentNode, true)) { String hosts = new String(zk.getData(parentNode+"/"+str, false , null)); ls.add(hosts); } }else { zk.getChildren("/", true); } } catch (KeeperException | InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } serverList = ls; System.out.println(ls); } public void doSomething() { System.out.println(serverList); try { Thread.sleep(Long.MAX_VALUE); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }
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