ZooKeeper 分佈式鎖 Curator 源碼 04：分佈式信號量和互斥鎖

2021 年 7 月 23 日
筆記
zookeeper, 分佈式鎖, 源碼

前言

分佈式信號量，之前在 Redisson 中也介紹過，Redisson 的信號量是將計數維護在 Redis 中的，那現在來看一下 Curator 是如何基於 ZooKeeper 實現信號量的。

使用 Demo

public class CuratorDemo {

    public static void main(String[] args) throws Exception {

        String connectString = "127.0.0.1:2181,127.0.0.1:2182,127.0.0.1:2183";

        RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3);

        CuratorFramework client = CuratorFrameworkFactory
                .builder()
                .connectString(connectString)
                .retryPolicy(retryPolicy)
                .build();
        client.start();

        InterProcessSemaphoreV2 semaphore = new InterProcessSemaphoreV2(client, "/semaphores/semaphore_01", 3);

        for (int i = 0; i < 10; i++) {
            new Thread(() -> {
                try {
                    System.out.println(Thread.currentThread() + " 線程 start - " + LocalTime.now());
                    Lease lease = semaphore.acquire();
                    System.out.println(Thread.currentThread() + " 線程 execute - " + LocalTime.now());
                    Thread.sleep(3000);
                    System.out.println(Thread.currentThread() + " 線程 over -" + LocalTime.now());
                    semaphore.returnLease(lease);
                } catch (Exception e) {

                }

            }).start();
        }

        Thread.sleep(1000000);

    }
}

控制台輸出數據如下：