Curator Simple Monitoring example

ZooKeeper (3.4.5) using curator to listen for events

Package Com.huey.dream.demo;Import Java.util.concurrent.ExecutorService;Import java.util.concurrent.Executors;Import Org.apache.curator.framework.CuratorFramework;Import Org.apache.curator.framework.CuratorFrameworkFactory;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.framework.recipes.cache.PathChildrenCache.StartMode;Import Org.apache.curator.retry.ExponentialBackoffRetry;/*** Curator Event Monitoring *@author Huey *@version 1.0 *@created 2015-3-2 */PublicClass Carutordemo { PublicStaticvoid Main (string[] args)Throws Exception { Curatorframework client = Curatorframeworkfactory.builder ()  . ConnectString ("192.168.1.109:2181")  . SESSIONTIMEOUTMS (5000)  . CONNECTIONTIMEOUTMS (3000)  . Retrypolicy (New Exponentialbackoffretry (1000,3))  . build (); Client.start (); Client.create ()  . creatingparentsifneeded ()  . Forpath ("/zk-huey/cnode","Hello". GetBytes ());  /** * When registering the listener, if this parameter is passed in, the logic is handled by the thread pool when the event is triggered */ Executorservice pool = Executors.newfixedthreadpool (2);  /** * Monitor the change of data node */  Final Nodecache Nodecache =New Nodecache (Client,"/zk-huey/cnode",FALSE); Nodecache.start (true); Nodecache.getlistenable (). AddListener (   New Nodecachelistener () {    @Override    Publicvoid NodeChanged ()Throws Exception {    System.out.println ("Node data is changed, new data:" +      New String (Nodecache.getcurrentdata (). GetData ()));   }  },  Pool );  /** * Monitor the change of child nodes */  Final Pathchildrencache Childrencache =New Pathchildrencache (Client,"/zk-huey",true); Childrencache.start (startmode.post_initialized_event); Childrencache.getlistenable (). AddListener (   New Pathchildrencachelistener () {    @Override    Publicvoid Childevent (curatorframework client, pathchildrencacheevent event)      Throws Exception {      Switch (Event.gettype ()) {      Case child_added:      System.out.println ("child_added:" + event.getdata (). GetPath ());       Break      Case child_removed:      System.out.println ("Child_removed:" + event.getdata (). GetPath ());       Break      Case child_updated:      System.out.println ("child_updated:" + event.getdata (). GetPath ());       Break      Default       Break    }   }  },   Pool );   Client.setdata (). Forpath ( "/zk-huey/cnode",  "World". GetBytes ());   Thread.Sleep (10 * 1000); Span class= "indent" >  Pool.shutdown ();   Client.close (); }              /span>                

Curator Simple Listener example