Apache curator Node Cache Watcher

Can only listen to the add,delete,update of a path itself

1.run Nodelistener

2.run NLTest

Package Com.collonn.javautilmvn.zookeeper.curator.nodecache;public class NLTest {public    static void main (string[ ] args) throws Exception {        nlclientcreate.main (null);        Thread.Sleep (+ 2);        Nlclientupdate.main (null);        Thread.Sleep (+ 2);        Nlclientdelete.main (null);}    }

Package Com.collonn.javautilmvn.zookeeper.curator.nodecache;import Org.apache.curator.retrypolicy;import Org.apache.curator.framework.curatorframework;import org.apache.curator.framework.CuratorFrameworkFactory; Import Org.apache.curator.framework.recipes.cache.*;import org.apache.curator.retry.ExponentialBackoffRetry;  Import Org.apache.curator.utils.ensurepath;import Java.util.list;public class Nodelistener {public static final String    C_path = "/testnode";    public static final String CHARSET = "UTF-8";                public static void Main (string[] args) {try {new Thread (new Runnable () {@Override public void Run () {try{String zookeeperconnectionstring = "127.0.0.                        1:2,181 ";                        Retrypolicy retrypolicy = new Exponentialbackoffretry (1000, 3);                     Curatorframework client = curatorframeworkfactory.newclient (zookeeperconnectionstring, Retrypolicy);   Client.start ();                        Final Nodecache Nodecache = new Nodecache (client, C_path);                            Nodecache.getlistenable (). AddListener (New Nodecachelistener () {@Override public void NodeChanged () throws Exception {System.out.println ("================== C                                Atch node Data Change ================== ");                                Childdata childdata = Nodecache.getcurrentdata (); if (Childdata = = null) {System.out.println ("===delete, path=" + C_path + ", childdata="                                + Childdata); }else{System.out.println ("===update or Add, path=" + C_path + ", childdata=" + new STR                                ING (Childdata.getdata (), CHARSET));                        }                            }                        });                     Nodecache.start ();   Thread.Sleep (Integer.max_value);                    Client.close ();                    }catch (Exception e) {e.printstacktrace ();        }}). Start ();        }catch (Exception e) {e.printstacktrace (); }    }}

Package Com.collonn.javautilmvn.zookeeper.curator.nodecache;import Org.apache.curator.retrypolicy;import Org.apache.curator.framework.curatorframework;import org.apache.curator.framework.CuratorFrameworkFactory; Import Org.apache.curator.retry.exponentialbackoffretry;import Org.apache.zookeeper.createmode;import Org.apache.zookeeper.data.stat;import Java.util.random;public class Nlclientcreate {public static void main (string[] A                    RGS) {New Thread (new Runnable () {@Override public void run () {try {                    String zookeeperconnectionstring = "127.0.0.1:2181";                    Retrypolicy retrypolicy = new Exponentialbackoffretry (1000, 3);                    Curatorframework client = curatorframeworkfactory.newclient (zookeeperconnectionstring, Retrypolicy);                    Client.start ();                    Stat stat = client.checkexists (). Forpath (Nodelistener.c_path);                    if (stat = = null) {    Client.create (). Withmode (createmode.persistent). Forpath (Nodelistener.c_path, "1". GetBytes (Nodelistener.charset                    ));                } client.close ();                } catch (Exception e) {e.printstacktrace ();    }}). Start (); }}

Package Com.collonn.javautilmvn.zookeeper.curator.nodecache;import Org.apache.curator.retrypolicy;import Org.apache.curator.framework.curatorframework;import org.apache.curator.framework.CuratorFrameworkFactory; Import Org.apache.curator.retry.exponentialbackoffretry;import Org.apache.zookeeper.data.stat;import Java.util.random;public class Nlclientupdate {public static void main (string[] args) {new Thread (new Runnable ( {@Override public void run () {try {String zookeeperconnection                    String = "127.0.0.1:2181";                    Retrypolicy retrypolicy = new Exponentialbackoffretry (1000, 3);                    Curatorframework client = curatorframeworkfactory.newclient (zookeeperconnectionstring, Retrypolicy);                    Client.start ();                    Stat stat = client.checkexists (). Forpath (Nodelistener.c_path); if (stat! = null) {Client.setdata (). Forpath (NodelistenEr.                    C_path, "GetBytes" (Nodelistener.charset));                } client.close ();                } catch (Exception e) {e.printstacktrace ();    }}). Start (); }}

Package Com.collonn.javautilmvn.zookeeper.curator.nodecache;import Org.apache.curator.retrypolicy;import Org.apache.curator.framework.curatorframework;import org.apache.curator.framework.CuratorFrameworkFactory; Import Org.apache.curator.retry.exponentialbackoffretry;import Org.apache.zookeeper.createmode;import Org.apache.zookeeper.data.stat;import Java.util.random;public class Nlclientdelete {public static void main (string[] A                    RGS) {New Thread (new Runnable () {@Override public void run () {try {                    String zookeeperconnectionstring = "127.0.0.1:2181";                    Retrypolicy retrypolicy = new Exponentialbackoffretry (1000, 3);                    Curatorframework client = curatorframeworkfactory.newclient (zookeeperconnectionstring, Retrypolicy);                    Client.start ();                    Stat stat = client.checkexists (). Forpath (Nodelistener.c_path);                    if (stat! = null) {    Client.delete (). Forpath (Nodelistener.c_path);                } client.close ();                } catch (Exception e) {e.printstacktrace ();    }}). Start (); }}

Apache curator Node Cache Watcher