如何使用Curator监听zookeeper事件变化

掌握zookeeper事件监听机制，非常重要，可以说是跨入了进阶的门槛，只有掌握了如何监听某个节点或路径，我们才能在节点变化后，做一些我们想做的事，包括：
1，配置文件同步
2，主从切换
3，分布式队列
4，分布式锁
5，其他

本篇我们就来看下，如何使用curator来完成监听，代码如下：

 package com.qin.curator.zk;

 import javax.sound.midi.Patch;

 import org.apache.curator.RetryPolicy;

 import org.apache.curator.framework.CuratorFramework;

 import org.apache.curator.framework.CuratorFrameworkFactory;

 import org.apache.curator.framework.CuratorFrameworkFactory.Builder;

 import org.apache.curator.framework.api.CuratorWatcher;

 import org.apache.curator.framework.recipes.cache.NodeCache;

 import org.apache.curator.framework.recipes.cache.NodeCacheListener;

 import org.apache.curator.framework.recipes.cache.PathChildrenCache;

 import org.apache.curator.framework.recipes.cache.PathChildrenCacheEvent;

 import org.apache.curator.framework.recipes.cache.PathChildrenCacheListener;

 import org.apache.curator.retry.ExponentialBackoffRetry;

 import org.apache.curator.utils.ZKPaths;

 import org.apache.zookeeper.WatchedEvent;

 /**

  *

  * 使用curator监听zookeeper节点

  * @author qindongliang

  * **/

 public class CuratorWatch {

     static CuratorFramework zkclient=null;

     static String nameSpace="php";

     static {

           String zkhost="192.168.46.22:2181";//zk的host

           RetryPolicy rp=new ExponentialBackoffRetry(1000, 3);//重试机制

           Builder builder = CuratorFrameworkFactory.builder().connectString(zkhost)

                   .connectionTimeoutMs(5000)

                   .sessionTimeoutMs(5000)

                   .retryPolicy(rp);

           builder.namespace(nameSpace);

           CuratorFramework zclient = builder.build();

           zkclient=zclient;

           zkclient.start();// 放在这前面执行

           zkclient.newNamespaceAwareEnsurePath(nameSpace);

     }

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

         watch();

         Thread.sleep(Long.MAX_VALUE);

     }

     /**

      *

      * 监听节点变化

      *

      * */

     public static void watch()throws Exception{

         PathChildrenCache cache = new PathChildrenCache(zkclient, "/zk", false);

         cache.start();

         System.out.println("监听开始/zk........");

         PathChildrenCacheListener plis=new PathChildrenCacheListener() {

             @Override

             public void childEvent(CuratorFramework client, PathChildrenCacheEvent event)

                     throws Exception {

                   switch ( event.getType() )

                     {

                         case CHILD_ADDED:

                         {

                             System.out.println("Node added: " + ZKPaths.getNodeFromPath(event.getData().getPath()));

                             break;

                         }

                         case CHILD_UPDATED:

                         {

                             System.out.println("Node changed: " + ZKPaths.getNodeFromPath(event.getData().getPath()));

                             break;

                         }

                         case CHILD_REMOVED:

                         {

                             System.out.println("Node removed: " + ZKPaths.getNodeFromPath(event.getData().getPath()));

                             break;

                         }

                     }

             }

         };

         //注册监听

         cache.getListenable().addListener(plis);

     }

 }

运行后的控制台打印：

 18:33:07.722 [main] INFO  o.a.c.f.imps.CuratorFrameworkImpl - Starting

 18:33:07.727 [main] DEBUG o.a.curator.CuratorZookeeperClient - Starting

 18:33:07.727 [main] DEBUG org.apache.curator.ConnectionState - Starting

 18:33:07.727 [main] DEBUG org.apache.curator.ConnectionState - reset

 18:33:07.734 [main] INFO  org.apache.zookeeper.ZooKeeper - Client environment:zookeeper.version=3.4.6-1569965, built on 02/20/2014 09:09 GMT

 18:33:07.734 [main] INFO  org.apache.zookeeper.ZooKeeper - Client environment:host.name=QINDONGLIANG.dhgatecn.msf

 18:33:07.734 [main] INFO  org.apache.zookeeper.ZooKeeper - Client environment:java.version=1.7.0_04

 18:33:07.734 [main] INFO  org.apache.zookeeper.ZooKeeper - Client environment:java.vendor=Oracle Corporation

 18:33:07.734 [main] INFO  org.apache.zookeeper.ZooKeeper - Client environment:java.home=D:\Java\jdk1.7.0_04\jre

 18:33:07.734 [main] INFO  org.apache.zookeeper.ZooKeeper - Client environment:java.class.path=D:\eclipseworkspace2yw\opzk\bin;D:\eclipseworkspace2yw\opzk\lib\curator-client-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-examples-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-framework-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-recipes-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-test-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-x-discovery-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-x-discovery-server-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\curator-x-rpc-2.6.0.jar;D:\eclipseworkspace2yw\opzk\lib\log4j-1.2.15.jar;D:\eclipseworkspace2yw\opzk\lib\zookeeper-3.4.5.jar;D:\eclipseworkspace2yw\opzk\lib\commons-io-2.1.jar

 18:33:07.734 [main] INFO  org.apache.zookeeper.ZooKeeper - Client environment:java.library.path=D:\Java\jdk1.7.0_04\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;D:/Java/jdk1.7.0_04/bin/../jre/bin/server;D:/Java/jdk1.7.0_04/bin/../jre/bin;D:/Java/jdk1.7.0_04/bin/../jre/lib/amd64;C:\Program Files\Common Files\Microsoft Shared\Windows Live;C:\Program Files (x86)\Common Files\Microsoft Shared\Windows Live;D:\Java\jdk1.7.0_04\bin;D:\Java\jdk1.7.0_04\jre\bin;D:\apache-ant-1.9.3\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Lenovo\Lenovo Home\;C:\Program Files (x86)\Windows Live\Shared;C:\Program Files\TortoiseSVN\bin;D:\hadoop-2.2.0/bin;C:\MyProgramFiles\apache-maven-3.0.5\bin;D:\python;E:\eclipse;;.

 18:33:07.734 [main] INFO  org.apache.zookeeper.ZooKeeper - Client environment:java.io.tmpdir=C:\Users\QINDON~1\AppData\Local\Temp\

 18:33:07.734 [main] INFO  org.apache.zookeeper.ZooKeeper - Client environment:java.compiler=<NA>

 18:33:07.734 [main] INFO  org.apache.zookeeper.ZooKeeper - Client environment:os.name=Windows 7

 18:33:07.734 [main] INFO  org.apache.zookeeper.ZooKeeper - Client environment:os.arch=amd64

 18:33:07.735 [main] INFO  org.apache.zookeeper.ZooKeeper - Client environment:os.version=6.1

 18:33:07.735 [main] INFO  org.apache.zookeeper.ZooKeeper - Client environment:user.name=qindongliang

 18:33:07.735 [main] INFO  org.apache.zookeeper.ZooKeeper - Client environment:user.home=C:\Users\qindongliang

 18:33:07.735 [main] INFO  org.apache.zookeeper.ZooKeeper - Client environment:user.dir=D:\eclipseworkspace2yw\opzk

 18:33:07.735 [main] INFO  org.apache.zookeeper.ZooKeeper - Initiating client connection, connectString=192.168.46.22:2181 sessionTimeout=5000 watcher=org.apache.curator.ConnectionState@2c351b05

 18:33:07.738 [main] DEBUG org.apache.zookeeper.ClientCnxn - zookeeper.disableAutoWatchReset is false

 18:33:07.760 [main-SendThread(192.168.46.22:2181)] INFO  org.apache.zookeeper.ClientCnxn - Opening socket connection to server 192.168.46.22/192.168.46.22:2181. Will not attempt to authenticate using SASL (unknown error)

 18:33:07.761 [main-SendThread(192.168.46.22:2181)] INFO  org.apache.zookeeper.ClientCnxn - Socket connection established to 192.168.46.22/192.168.46.22:2181, initiating session

 18:33:07.762 [main-SendThread(192.168.46.22:2181)] DEBUG org.apache.zookeeper.ClientCnxn - Session establishment request sent on 192.168.46.22/192.168.46.22:2181

 18:33:07.766 [main-SendThread(192.168.46.22:2181)] INFO  org.apache.zookeeper.ClientCnxn - Session establishment complete on server 192.168.46.22/192.168.46.22:2181, sessionid = 0x148ac15236f0046, negotiated timeout = 5000

 18:33:07.771 [main-EventThread] INFO  o.a.c.f.state.ConnectionStateManager - State change: CONNECTED

 18:33:08.784 [main-SendThread(192.168.46.22:2181)] DEBUG org.apache.zookeeper.ClientCnxn - Reading reply sessionid:0x148ac15236f0046, packet:: clientPath:null serverPath:null finished:false header:: 1,3  replyHeader:: 1,233,0  request:: '/php,F  response:: s{117,117,1411712541330,1411712541330,0,5,0,0,0,3,204}

 18:33:08.784 [main-SendThread(192.168.46.22:2181)] DEBUG org.apache.zookeeper.ClientCnxn - Got ping response for sessionid: 0x148ac15236f0046 after 4ms

 监听开始/zk........

 18:33:08.795 [main-SendThread(192.168.46.22:2181)] DEBUG org.apache.zookeeper.ClientCnxn - Reading reply sessionid:0x148ac15236f0046, packet:: clientPath:null serverPath:null finished:false header:: 2,3  replyHeader:: 2,233,0  request:: '/php,F  response:: s{117,117,1411712541330,1411712541330,0,5,0,0,0,3,204}

 18:33:08.797 [main-SendThread(192.168.46.22:2181)] DEBUG org.apache.zookeeper.ClientCnxn - Reading reply sessionid:0x148ac15236f0046, packet:: clientPath:null serverPath:null finished:false header:: 3,3  replyHeader:: 3,233,0  request:: '/php/zk,F  response:: s{151,182,1411714954448,1411716422668,2,5,0,0,9,3,228}

 18:33:08.804 [main-SendThread(192.168.46.22:2181)] DEBUG org.apache.zookeeper.ClientCnxn - Reading reply sessionid:0x148ac15236f0046, packet:: clientPath:/php/zk serverPath:/php/zk finished:false header:: 4,12  replyHeader:: 4,233,0  request:: '/php/zk,T  response:: v{'bb,'cc,'cc334},s{151,182,1411714954448,1411716422668,2,5,0,0,9,3,228}

 18:33:08.815 [main-SendThread(192.168.46.22:2181)] DEBUG org.apache.zookeeper.ClientCnxn - Reading reply sessionid:0x148ac15236f0046, packet:: clientPath:/php/zk/bb serverPath:/php/zk/bb finished:false header:: 5,4  replyHeader:: 5,233,0  request:: '/php/zk/bb,T  response:: #6920616d2061207a6b20636f6e74656e742031,s{152,156,1411714954452,1411714982893,2,0,0,0,19,0,152}

 18:33:08.816 [main-SendThread(192.168.46.22:2181)] DEBUG org.apache.zookeeper.ClientCnxn - Reading reply sessionid:0x148ac15236f0046, packet:: clientPath:/php/zk/cc serverPath:/php/zk/cc finished:false header:: 6,4  replyHeader:: 6,233,0  request:: '/php/zk/cc,T  response:: #63313163,s{185,222,1411716737805,1411725726750,3,0,0,0,4,0,185}

 18:33:08.817 [main-SendThread(192.168.46.22:2181)] DEBUG org.apache.zookeeper.ClientCnxn - Reading reply sessionid:0x148ac15236f0046, packet:: clientPath:/php/zk/cc334 serverPath:/php/zk/cc334 finished:false header:: 7,4  replyHeader:: 7,233,0  request:: '/php/zk/cc334,T  response:: #636363,s{189,226,1411716744253,1411725775109,2,3,0,0,3,3,220}

 Node added: bb

 Node added: cc

 Node added: cc334

 18:33:10.482 [main-SendThread(192.168.46.22:2181)] DEBUG org.apache.zookeeper.ClientCnxn - Got ping response for sessionid: 0x148ac15236f0046 after 1ms

 18:33:12.148 [main-SendThread(192.168.46.22:2181)] DEBUG org.apache.zookeeper.ClientCnxn - Got ping response for sessionid: 0x148ac15236f0046 after 1ms

如何使用Curator监听zookeeper事件变化的更多相关文章

ionic 监听路由事件变化
(function(){ angular.module("cakeStore", ["ngRoute", "ionic","coo ...
ZooKeeper(3.4.5) 使用Curator监听事件
转载:http://www.mamicode.com/info-detail-494364.html 标签: ZooKeeper原生的API支持通过注册Watcher来进行事件监听,但是Watcher ...
Zookeeper命令行操作(常用命令；客户端连接；查看znode路径；创建节点；获取znode数据，查看节点内容，设置节点内容，删除节点；监听znode事件；telnet连接zookeeper)
8.1.常用命令启动ZK服务 bin/zkServer.sh start 查看ZK服务状态 bin/zkServer.sh status 停止ZK服务 bin/zkServer.sh stop 重启 ...
.Net客户端监听ZooKeeper节点数据变化
一个很简单的例子,用途是监听zookeeper中某个节点数据的变化,具体请参见代码中的注释 using System; using System.Collections.Generic; using ...
onchange监听input值变化及input隐藏后change事件不触发的原因与解决方法(设置readonly后onchange不起作用的解决方案)
转自:https://www.cnblogs.com/white0710/p/7338456.html 1. onchange事件监听input值变化的使用方法: <input id=" ...
HTML5 oninput实时监听输入框值变化的完美方案
在网页开发中经常会碰到需要动态监听输入框值变化的情况,如果使用 onkeydown.onkeypress.onkeyup 这个几个键盘事件来监测的话,监听不了右键的复制.剪贴和粘贴这些操作,处理组合快 ...
【转载】实时监听输入框值变化的完美方案：oninput & onpropertychange
oninput 是 HTML5 的标准事件,对于检测 textarea, input:text, input:password 和 input:search 这几个元素通过用户界面发生的内容变化非常有 ...
实时监听输入框值变化：oninput & onpropertychange
结合 HTML5 标准事件 oninput 和 IE 专属事件 onpropertychange 事件来监听输入框值变化. oninput 是 HTML5 的标准事件,对于检测 textarea, i ...
js/jquery 实时监听输入框值变化的完美方案：oninput & onpropertychange
(1) 先说jquery, 使用 jQuery 库的话,只需要同时绑定 oninput 和 onpropertychange 两个事件就可以了,示例代码: $('#username').bin ...

随机推荐

搭建自己的博客（十七）：添加每日阅读量并使用highcharts通过图表显示
之前写了单篇博客的阅读量统计,今天添加了博客总阅读量统计,并且使用highcharts图表显示. 1.变化的部分
Hadoop Aggregate Resource Allocation解释
1.在hadoop里面运行程序的时候,查看某个任务的具体信息如下: [hadoop@master monitor]$ yarn application -list 如上图,这里面的Aggregate ...
can't read property 'push' of undefined
在某些情况下是因为没有初始化,所以初始化一下就好了
spring boot 之如何创建spring boot项目
创建spring boot的方式有非常多,今天我们使用maven来进行创建spring boot项目,因为maven使用的非常广泛,也很好用,很多IDE也都支持maven. 1 创建maven项目 1 ...
如何在虚拟机中安装kali linux
整理笔记,把以前印象笔记中记录的一些东西翻出来,想想发个随笔吧. 第一步在官网下载kali linux的镜像. 网址:https://www.kali.org/downloads/ (我的电脑是64位 ...
js的一些笔试面试题
1. 判断字符串是否是这样组成的,第一个必须是字母,后面可以是字母.数字.下划线,总长度为5-20 var reg = /^[a-zA-Z][a-zA-Z_0-9]{4,19}$/; reg.test ...
windows开机执行bat
一.以windows下备份sql数据库为例,开机自动执行.bat脚本 1.新建dump.bat文件,文件中的代码如下: set YYYYmmdd=%date ...
【Canvas】勾画调和级数Harmonic series 曲线 y=1+1/2+1/3+1/4+1/5+1/6+1/7+1/8+....
相关资料:https://baike.baidu.com/item/%E8%B0%83%E5%92%8C%E7%BA%A7%E6%95%B0/8019971?fr=aladdin 调和级数(英语:Ha ...
SQL SERVER SELECT语句中加锁选项的详细说明
共享锁(读锁)和排他锁(写锁) 共享锁(S锁):共享 (S) 用于不更改或不更新数据的操作(只读操作),如 SELECT 语句. 如果事务T对数据A加上共享锁后,则其他事务只能对A再加共享锁,不能 ...
asyncio与gevent并发性能测试
asyncio与gevent并发性能测试在对网站进行扫描或者暴破时需要对网站进行高并发操作,然而requests+concurrent多线程性能上不太理想,了解到python用得比较多的并发库有as ...

如何使用Curator监听zookeeper事件变化

如何使用Curator监听zookeeper事件变化的更多相关文章

随机推荐

热门专题