zookeeper实现分布式锁

引入依赖

 org.apache.curator
 curator‐recipes
 5.2.0

代码：

public int outOfWarehouseWithLock() throws Exception {
        //设置ZK客户端重试策略, 每隔1秒重试一次，最多重试3次
        RetryPolicy policy = new ExponentialBackoffRetry(1000, 3);

        //创建ZK客户端，连接到Zookeeper服务器
        Curatorframework client = CuratorframeworkFactory.builder().connectString("ip:2181").retryPolicy(policy).build();
        //创建与Zookeeper服务器的连接
        client.start();

        //声明锁对象，本质就是ZK顺序临时节点
        final InterProcessMutex mutex = new InterProcessMutex(client, "/locks/wh-shoe");
        try {
            //请求锁，创建锁
            mutex.acquire();
            //处理业务逻辑
            if (WarehouseService.shoe > 0) {
                Thread.sleep(500);
                //扣减库存
                return --WarehouseService.shoe;
            } else {
                //库存不足，
                throw new RuntimeException("库存不足");
            }
        } finally {
            //释放锁
            mutex.release();
        }
    }