Curator Zookeeper分布式锁

Curator Zookeeper分布式锁

pom.xml中添加如下配置

<!-- https://mvnrepository.com/artifact/org.apache.curator/curator-recipes -->
<dependency>
  <groupId>org.apache.curator</groupId>
  <artifactId>curator-recipes</artifactId>
  <version>2.10.0</version>
</dependency>

zookeeper配置

下载zookeeper并解压至D:\java\zookeeper-3.4.6：

http://www.eu.apache.org/dist/zookeeper/zookeeper-3.4.6/zookeeper-3.4.6.tar.gz

zookeeper配置文件：

zoo-1.cfg

# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just
# example sakes.
dataDir=D:/java/zookeeper-3.4.6/data/1
#日志位置
dataLogDir=D:/java/zookeeper-3.4.6/log/1
# the port at which the clients will connect
clientPort=2181
# the maximum number of client connections.
# increase this if you need to handle more clients
#maxClientCnxns=60
#
# Be sure to read the maintenance section of the
# administrator guide before turning on autopurge.
#
# http:/zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance
#
# The number of snapshots to retain in dataDir
#autopurge.snapRetainCount=3
# Purge task interval in hours
# Set to "0" to disable auto purge feature
#autopurge.purgeInterval=1
server.1=localhost:2887:3887
server.2=localhost:2888:3888
server.3=localhost:2889:3889

zoo-2.cfg和zoo-3.cfg修改如下配置并创建相应的目录

修改clientPort：

zoo-1.cfg：clientPort=2181
zoo-2.cfg：clientPort=2182
zoo-3.cfg：clientPort=2183

创建目录：

zoo-1.cfg：D:/java/zookeeper-3.4.6/data/1
zoo-2.cfg：D:/java/zookeeper-3.4.6/data/2
zoo-3.cfg：D:/java/zookeeper-3.4.6/data/3

分别创建文件：myid，内容分别为各自的id：1、2和3

D:/java/zookeeper-3.4.6/data/1/myid：1
D:/java/zookeeper-3.4.6/data/2/myid：2
D:/java/zookeeper-3.4.6/data/3/myid：3

分别自动各个zookeeper实例

代码测试

import org.apache.curator.RetryPolicy;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.recipes.locks.InterProcessMutex;
import org.apache.curator.retry.ExponentialBackoffRetry;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

public class CuratorLockTest {
    public static void main(String[] args) throws InterruptedException {
        CountDownLatch latch = new CountDownLatch(5);
        String zookeeperConnectionString = "localhost:2181,localhost:2182,localhost:2183";
        RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3);
        CuratorFramework client = CuratorFrameworkFactory.newClient(
                zookeeperConnectionString, retryPolicy);
        client.start();
        System.out.println("客户端启动。。。。");
        ExecutorService exec = Executors.newCachedThreadPool();
        for (int i = 0; i < 5; i++) {
            exec.submit(new MyLock("client" + i, client, latch));
        }
        exec.shutdown();
        latch.await();
        System.out.println("所有任务执行完毕");
        client.close();
        System.out.println("客户端关闭。。。。");
    }

    static class MyLock implements Runnable {
        private String name;
        private CuratorFramework client;
        private CountDownLatch latch;

        public MyLock(String name, CuratorFramework client, CountDownLatch latch) {
            this.name = name;
            this.client = client;
            this.latch = latch;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public void run() {
            InterProcessMutex lock = new InterProcessMutex(client, "/test_group");
            try {
                System.out.println("------" + this.name + "---------等待获取锁。--------");
                if (lock.acquire(120, TimeUnit.SECONDS)) {
                    try {
                        System.out.println("----------" + this.name + "获得资源----------");
                        System.out.println("----------" + this.name + "正在处理资源----------");
                        Thread.sleep(10 * 1000);
                        System.out.println("----------" + this.name + "资源使用完毕----------");
                        latch.countDown();
                    } finally {
                        lock.release();
                        System.out.println("----------" + this.name + "释放----------");
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

运行结果：

客户端启动。。。。
------client1---------等待获取锁。--------
------client2---------等待获取锁。--------
------client0---------等待获取锁。--------
------client4---------等待获取锁。--------
------client3---------等待获取锁。--------
----------client1获得资源----------
----------client1正在处理资源----------
----------client1资源使用完毕----------
----------client1释放----------
----------client3获得资源----------
----------client3正在处理资源----------
----------client3资源使用完毕----------
----------client3释放----------
----------client0获得资源----------
----------client0正在处理资源----------
----------client0资源使用完毕----------
----------client0释放----------
----------client4获得资源----------
----------client4正在处理资源----------
----------client4资源使用完毕----------
----------client4释放----------
----------client2获得资源----------
----------client2正在处理资源----------
----------client2资源使用完毕----------
所有任务执行完毕

参考文档：

• http://blog.csdn.net/xiao_jun_0820/article/details/19110387