Zookeeper 批量获取锁：高性能 Java 代码示例 - 提高效率

以下是一个使用Zookeeper实现批量获取锁的高性能代码示例：\n\njava\nimport org.apache.zookeeper.*;\nimport org.apache.zookeeper.data.Stat;\nimport java.util.ArrayList;\nimport java.util.List;\nimport java.util.concurrent.CountDownLatch;\n\npublic class ZookeeperLock {\n private static final String ZOOKEEPER_SERVER = 'localhost:2181';\n private static final int CONNECTION_TIMEOUT = 5000;\n private static final String LOCK_ROOT = '/locks';\n private static final String LOCK_PREFIX = 'lock_';\n private List<ZooKeeper> zooKeeperList = new ArrayList<>();\n private List<String> lockPaths = new ArrayList<>();\n\n public void acquireLocks(int numLocks) throws Exception {\n CountDownLatch latch = new CountDownLatch(numLocks);\n for (int i = 0; i < numLocks; i++) {\n ZooKeeper zooKeeper = new ZooKeeper(ZOOKEEPER_SERVER, CONNECTION_TIMEOUT, null);\n zooKeeperList.add(zooKeeper);\n\n String lockPath = zooKeeper.create(LOCK_ROOT + '/' + LOCK_PREFIX, new byte[0], ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL_SEQUENTIAL);\n lockPaths.add(lockPath);\n\n zooKeeper.exists(lockPath, new Watcher() {\n @Override\n public void process(WatchedEvent event) {\n if (event.getType() == Event.EventType.NodeDeleted) {\n latch.countDown();\n }\n }\n });\n }\n\n latch.await(); // 等待所有锁都释放\n\n // 所有锁都已释放，可以进行后续操作\n System.out.println('All locks have been released.');\n }\n\n public void releaseLocks() {\n for (int i = 0; i < zooKeeperList.size(); i++) {\n ZooKeeper zooKeeper = zooKeeperList.get(i);\n String lockPath = lockPaths.get(i);\n try {\n Stat stat = zooKeeper.exists(lockPath, false);\n if (stat != null) {\n zooKeeper.delete(lockPath, -1);\n }\n zooKeeper.close();\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n }\n\n public static void main(String[] args) {\n ZookeeperLock zookeeperLock = new ZookeeperLock();\n try {\n // 获取5个锁\n zookeeperLock.acquireLocks(5);\n\n // 进行需要加锁的操作\n System.out.println('Performing locked operation...');\n\n // 模拟操作时间\n Thread.sleep(5000);\n\n // 释放锁\n zookeeperLock.releaseLocks();\n } catch (Exception e) {\n e.printStackTrace();\n }\n }\n}\n\n\n这个代码示例使用Zookeeper的临时顺序节点来实现锁的获取和释放。在acquireLocks方法中，它会创建指定数量的临时顺序节点，并监听节点删除事件，当节点被删除时，表示锁已释放，计数器减一。在releaseLocks方法中，它会删除所有创建的节点，并关闭ZooKeeper连接。\n\n使用这个代码示例，你可以通过调用acquireLocks方法来批量获取指定数量的锁，然后进行需要加锁的操作，最后调用releaseLocks方法释放锁。