package com.shaolong;

public class Lock {
    private String lockId;
    private boolean isActive;
    private String path;

    public Lock() {
    }

    public Lock(String lockId, String path) {
        this.lockId = lockId;
        this.path = path;
    }

    public String getLockId() {
        return lockId;
    }

    public void setLockId(String lockId) {
        this.lockId = lockId;
    }

    public boolean isActive() {
        return isActive;
    }

    public void setActive(boolean active) {
        isActive = active;
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }
}

package com.shaolong;

import org.I0Itec.zkclient.IZkDataListener;
import org.I0Itec.zkclient.ZkClient;

import java.util.List;
import java.util.stream.Collectors;

public class ZookeeperLock {
    private ZkClient zkClient;

    private String rootConcatPath = "/wms_lock/";// 從根路徑開始 拼接 /wms_lock/itm-0001-0000000026 節(jié)點

    private String root = "/wms_lock";

    public ZookeeperLock(){
        zkClient = new ZkClient("127.0.0.1:2181,127.0.0.1:2182,127.0.0.1:2183",2000,5000);
        if(!zkClient.exists(root)){
            zkClient.createPersistent(root);
        }
    }

    public Lock lock(String lockId,long timeOut){
        Lock lockNode = createLockNode(lockId);
        lockNode = tryActiveLock(lockNode);
        if(!lockNode.isActive()){
            try {
                synchronized (lockNode){
                    lockNode.wait(timeOut);
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        return lockNode;
    }

    public Lock tryActiveLock(Lock lock){
        //判斷是否獲得鎖
        List<String> list = zkClient.getChildren(root)
                .stream().sorted()
                .map(p -> root+"/" + p)
                .collect(Collectors.toList());
        String firstPath = list.get(0);
        if(firstPath.equals(lock.getPath())){
            lock.setActive(true);
        }else{
            //添加監(jiān)聽
            String upNodePath = list.get(list.indexOf(lock.getPath()) - 1);
            zkClient.subscribeDataChanges(upNodePath, new IZkDataListener() {
                @Override
                public void handleDataChange(String s, Object o) throws Exception {

                }

                @Override
                public void handleDataDeleted(String dataPath) throws Exception {
                    System.out.println("刪除節(jié)點 "+dataPath);
                    Lock lockNode = tryActiveLock(lock);
                    synchronized (lock){
                        if(lockNode.isActive()){
                            lockNode.notify();
                        }
                    }
                    zkClient.unsubscribeDataChanges(upNodePath,this);
                }
            });
        }

        //添加上一個節(jié)點監(jiān)聽

        //再次重試激活鎖

        return  lock;
    }

    public void unLock(Lock lock){
        zkClient.delete(lock.getPath());
    }

    private Lock createLockNode(String lockId){
        //創(chuàng)建好目錄
        createMakedir(lockId);

        //創(chuàng)建臨時節(jié)點
        String path = zkClient.createEphemeralSequential(rootConcatPath + lockId, "w");
        Lock lock = new Lock();
        lock.setLockId(lockId);
        lock.setPath(path);
        lock.setActive(false);
        return lock;
    }

    private void createMakedir(String lockId) {
        if(lockId.contains("/")){
            String temp = lockId;
            if(lockId.startsWith("/")){
                temp = lockId.substring(1);
            }
            String[] split = temp.split("/");
            for (int i=0;i<split.length-1;i++) {
                root+="/"+split[i];
                if (!zkClient.exists(root)) {
                    zkClient.createPersistent(root);
                }
            }
            if(lockId.startsWith("/")){
                rootConcatPath = rootConcatPath.substring(0,rootConcatPath.length()-1);
            }
        }
    }
}

package com.xinhua.zk;

import com.shaolong.Lock;
import com.shaolong.ZookeeperLock;

public class RawOut implements Runnable{

    ZookeeperLock lock2 = new ZookeeperLock();

    String lockId = "rawout/aaa/bbb/mm/itm-0001-";
    @Override
    public void run() {
        Lock lock = null;
        try {
             lock = lock2.lock(lockId, 3000);
            Thread.sleep(3000);

        }catch (Exception e){
            e.printStackTrace();
        }finally {
            lock2.unLock(lock);
        }

    }
}

package com.xinhua.zk;

public class test {
    public static void main(String[] args) {
        for (int i = 0; i < 10; i++) {
            new Thread(new RawOut()).start();
        }
    }
}