Zookeeper 分布式事务锁的使用

使用Netflix的包 curator-recipes

pom文件引入相关依赖

        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.6.3</version>
        </dependency>

        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-framework</artifactId>
            <version>5.2.0</version>
            <exclusions>
                <exclusion>
                    <groupId>org.apache.zookeeper</groupId>
                    <artifactId>zookeeper</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-api</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-recipes</artifactId>
            <version>5.2.0</version>
            <exclusions>
                <exclusion>
                    <groupId>org.apache.zookeeper</groupId>
                    <artifactId>zookeeper</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

使用范例：

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;

......

	private static final String SIT_ZK_IP_PORT = "10.82.232.9xx:2181,10.82.232.9xx:2181,10.82.2329xx68:2181";

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

		//创建zookeeper客户端连接
		//重试策略, 参数1：等待时间, 参数2：重试次数
		RetryPolicy policy = new ExponentialBackoffRetry(2000, 3);
		final String ZK_IP_PORT = SIT_ZK_IP_PORT;
		CuratorFramework client = CuratorFrameworkFactory.builder().connectString(ZK_IP_PORT).retryPolicy(policy).build();
		client.start();
		final InterProcessMutex mutex = new InterProcessMutex(client, "/fruit-history-package-lock");

		long startTime = 0L;
		try {
			System.out.println("==== 开始抢锁.... ");
			mutex.acquire();
			startTime = System.currentTimeMillis();
			System.out.println("==== 抢到锁, 开始执行.... ");
			// 自己的搬砖逻辑
			doXX();
		} catch (Exception e) {
			e.printStackTrace();
			throw new RuntimeException("执行抛异常，请检查", e);
		} finally {
			try {
				mutex.release();
			} catch (Exception e) {
				e.printStackTrace();
			}
			System.out.println("==== 执行完毕, 释放锁....耗时: " + (System.currentTimeMillis() - startTime)/1000 + "秒");
		}
	}

会在zk上创建临时节点 fruit-history-package-lock， 并在该节点下创建顺序临时节点用于锁机制的排队