十一、curator recipes之联锁InterProcessMultiLock
简介
curator实现了一个类似容器的锁InterProcessMultiLock,它可以把多个锁包含起来像一个锁一样进行操作,简单来说就是对多个锁进行一组操作。当acquire的时候就获得多个锁资源,否则失败。当release时候释放所有锁资源,不过如果其中一把锁释放失败将会被忽略。
官方文档:http://curator.apache.org/curator-recipes/multi-shared-lock.html
代码示例
import org.apache.curator.framework.CuratorFramework; import org.apache.curator.framework.CuratorFrameworkFactory; import org.apache.curator.framework.recipes.locks.InterProcessLock; import org.apache.curator.framework.recipes.locks.InterProcessMultiLock; import org.apache.curator.framework.recipes.locks.InterProcessMutex; import org.apache.curator.retry.ExponentialBackoffRetry; import java.util.ArrayList; import java.util.List; public class MultiLockDemo { private static CuratorFramework client = CuratorFrameworkFactory.newClient("localhost:2181", new ExponentialBackoffRetry(3000, 2)); private static String path1 = "/mutex/001"; private static String path2 = "/mutex/002"; private static List<InterProcessLock> mutexes = new ArrayList<>(); private static InterProcessMutex mutex1; private static InterProcessMutex mutex2; static { mutex1 = new InterProcessMutex(client, path1); mutex2 = new InterProcessMutex(client, path2); mutexes.add(mutex1); mutexes.add(mutex2); client.start(); } public static void main(String[] args) throws Exception { InterProcessMultiLock multiLock = new InterProcessMultiLock(mutexes); multiLock.acquire(); System.out.println("acquired multi lock"); startThread0(); startThread1(); Thread.sleep(5000); multiLock.release(); System.out.println("release multi lock"); Thread.sleep(50000); client.close(); } public static void startThread0() throws InterruptedException { Thread.sleep(1000); new Thread(() -> { try { System.out.println("thread0 acquring"); mutex1.acquire(); System.out.println("thread0 acquired"); } catch (Exception e) { e.printStackTrace(); } finally { try { mutex1.release(); } catch (Exception e) { e.printStackTrace(); } } }).start(); } public static void startThread1() throws InterruptedException { Thread.sleep(1000); new Thread(() -> { try { System.out.println("thread1 acquiring"); mutex2.acquire(); System.out.println("thread1 acquired"); } catch (Exception e) { e.printStackTrace(); } finally { try { mutex2.release(); } catch (Exception e) { e.printStackTrace(); } } }).start(); } }