zookeeper 删除节点信息

xingcsdnboke

于 2023-05-10 10:47:31 发布

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分类专栏： Zookeeper 文章标签： java

本文链接：https://blog.youkuaiyun.com/xingcsdnboke/article/details/130596035

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该代码示例展示了一个名为DeleteNode的类，实现了ZooKeeper的Watcher接口。程序连接到指定的ZooKeeper服务器，检查路径/ppp/ppp的节点是否存在，并在连接状态同步时尝试删除该节点。如果节点存在，删除后再次检查其状态以确认删除操作的成功。

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public class DeleteNode implements Watcher {

    private static ZooKeeper zooKeeper;

    public static void main(String[] args) throws InterruptedException, IOException {
        zooKeeper = new ZooKeeper("101.132.167.18:2181",5000,new DeleteNode());
        Thread.sleep(Integer.MAX_VALUE);
    }

    @Override
    public void process(WatchedEvent watchedEvent) {
        if(watchedEvent.getState() == Event.KeeperState.SyncConnected){
            try {
                deleteNodeSync();
            } catch (KeeperException e) {
                e.printStackTrace();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    private void deleteNodeSync() throws KeeperException, InterruptedException {
        /**
         * zooKeeper.exists(path,watch) : 判断节点是否存在
         * zooKeeper.delete(path,version) : 删除节点
         */
        Stat stat = zooKeeper.exists("/ppp/ppp", false);
        System.out.println(stat == null ? "该节点不存在":"该节点存在");
        if(stat != null){
            zooKeeper.delete("/ppp/ppp",-1);
        }
        Stat stat2 = zooKeeper.exists("/ppp/ppp", false);
        System.out.println(stat2 == null ? "该节点不存在":"该节点存在");
    }
}