zookeeper如何实现竞争锁

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package com.hgs.sharelocks;import java.util.Collections;import java.util.List;import org.apache.zookeeper.CreateMode;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 ZKsharelocks {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";    private final static String subNode="/sub";    private volatile String myPath = null;    private boolean lockflag = false;public static void main(String[] args) throws Exception {ZKsharelocks sl = new ZKsharelocks();sl.getConnect();Thread.sleep(Long.MAX_VALUE);}public void getConnect() throws Exception{//创建实例zk = new ZooKeeper(connectString, sessionTimeout, new Watcher() {@Overridepublic void process(WatchedEvent event) {//判断事件的类型以及路径是否是业务路径if(event.getType()==EventType.NodeChildrenChanged&&event.getPath().equals(parentNode)) {List inchild = null;                          try {                          //得到子节点，继续监听                          inchild = zk.getChildren(parentNode, true);                          //排序                          Collections.sort(inchild);                          //判断返回的时间路径不是null并且最小的子路经是当天路径                          if(myPath != null&&inchild.size()>0&&inchild.indexOf(myPath.substring(parentNode.length()+1))==0) {                              doSomthing();                          Thread.sleep(2000);                          myPath=zk.create(parentNode+subNode, null, Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL_SEQUENTIAL);                          }} catch (Exception e) {e.printStackTrace();}}}});//首先创建一个临时的序列的条目myPath=zk.create(parentNode+subNode, null, Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL_SEQUENTIAL);//得到父节点下面的子目录数并进行监听List childs = zk.getChildren(parentNode, true);//判断进入到的时候是否只有自己，如果只有自己则可以做业务逻辑if(childs.size()==1) {//业务方法，在业务方法内有删除myPath条目的操作doSomthing();//删除完成后继续myPath=zk.create(parentNode+subNode, null, Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL_SEQUENTIAL);}}public void doSomthing() throws Exception {System.out.println("get the lock..."+Thread.currentThread().getName());//得到锁完成业务后，删除持有的锁，即删除该条目zk.delete(myPath, -1);}}

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