zookeeper应用场景二：分布式锁

        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-framework</artifactId>
            <version>4.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-recipes</artifactId>
            <version>4.0.0</version>
        </dependency>

public class InterprocessLock {
    public static void main(String[] args)  {
        CuratorFramework zkClient = getZkClient();
        String lockPath = "/lock";
        InterProcessMutex lock = new InterProcessMutex(zkClient, lockPath);
        //模拟50个线程抢锁
        for (int i = 0; i < 50; i++) {
            new Thread(new TestThread(i, lock)).start();
        }
    }
    static class TestThread implements Runnable {
        private Integer threadFlag;
        private InterProcessMutex lock;
        public TestThread(Integer threadFlag, InterProcessMutex lock) {
            this.threadFlag = threadFlag;
            this.lock = lock;
        }
        @Override
        public void run() {
            try {
                lock.acquire();
                System.out.println("第"+threadFlag+"线程获取到了锁");
                //等到1秒后释放锁
                Thread.sleep(1000);
            } catch (Exception e) {
                e.printStackTrace();
            }finally {
                try {
                    lock.release();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }
    private static CuratorFramework getZkClient() {
        String zkServerAddress = "192.168.3.39:2181";
        ExponentialBackoffRetry retryPolicy = new ExponentialBackoffRetry(1000, 3, 5000);
        CuratorFramework zkClient = CuratorFrameworkFactory.builder()
                .connectString(zkServerAddress)
                .sessionTimeoutMs(5000)
                .connectionTimeoutMs(5000)
                .retryPolicy(retryPolicy)
                .build();
        zkClient.start();
        return zkClient;
    }
}