Apache curator Tree Cache Watcher

You can monitor the sub-nodes (all sub-nodes, regardless of the number of sub-nodes) in a path.

More convenient than Nodecache, can listen to a group of nodes, instead of a node to set up a node to monitor

1.run Treelistener2.run Tltest

Package Com.collonn.javautilmvn.zookeeper.curator.treecache;public class Tltest {public    static void main (string[ ] args) throws Exception {        tlclientcreate.main (null);        Thread.Sleep (+);        Tlclientupdate.main (null);        Thread.Sleep (+);        Tlclientcreatesub.main (null);        Thread.Sleep (+);        Tlclientupdatesub.main (null);        Thread.Sleep (+);        Tlclientdeletesub.main (null);        Thread.Sleep (+);        Tlclientdelete.main (null);}    }
Package Com.collonn.javautilmvn.zookeeper.curator.treecache;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;import Java.util.map;public class TreeListener {    public static final String C_path = "/testtree";    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 Treecache Treecache = new Treecache (client, C_path);                            Treecache.getlistenable (). AddListener (New Treecachelistener () {@Override                                public void Childevent (curatorframework client, treecacheevent event) throws Exception {                                System.out.println ("================== Catch Tree Change ==================");                                    if (event.getdata () = = null) {System.out.println ("===init," + event.gettype ());                                Return } if (Event.getdata (). GetData () = = null) {System.out.prin                                TLN ("===delete," + event.gettype () + "," + event.getdata (). GetPath ()); }else{System.out.println ("===update or Add," + EVEnt.gettype () + "," + event.getdata (). GetPath () + "," + New String (Event.getdata (). GetData (), treelistener.charset));                        }                            }                        });                        Treecache.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.treecache;import Com.collonn.javautilmvn.zookeeper.curator.nodecache.nodelistener;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;public class Tlclientcreate {public static void main (string[] args) {new Thread (New Runnable () {@Override public void run () {try {String Zooke                    eperconnectionstring = "127.0.0.1:2181";                    Retrypolicy retrypolicy = new Exponentialbackoffretry (1000, 3);                    Curatorframework client = curatorframeworkfactory.newclient (zookeeperconnectionstring, Retrypolicy);                    Client.start ();           Stat stat = client.checkexists (). Forpath (Treelistener.c_path);         if (stat = = null) {client.create (). Withmode (createmode.persistent). Forpath (treelistener.c                    _path, "-1". GetBytes (Nodelistener.charset));                } client.close ();                } catch (Exception e) {e.printstacktrace ();    }}). Start (); }}

Package Com.collonn.javautilmvn.zookeeper.curator.treecache;import Com.collonn.javautilmvn.zookeeper.curator.nodecache.nodelistener;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;public class Tlclientcreatesub {public static void main (string[] args) {new Thr EAD (New Runnable () {@Override public void run () {try {String Zo                    okeeperconnectionstring = "127.0.0.1:2181";                    Retrypolicy retrypolicy = new Exponentialbackoffretry (1000, 3);                    Curatorframework client = curatorframeworkfactory.newclient (zookeeperconnectionstring, Retrypolicy);                    Client.start (); Stat stat = client.checkexists (). Forpath (Treelistener.c_path + "/sub1"); if (stat = = null) {client.create (). Withmode (createmode.persistent). Forpath (Treelistener.c_path + "                    /sub1 ","-1 ". GetBytes (Nodelistener.charset));                } client.close ();                } catch (Exception e) {e.printstacktrace ();    }}). Start (); }}

Package Com.collonn.javautilmvn.zookeeper.curator.treecache;import Com.collonn.javautilmvn.zookeeper.curator.nodecache.nodelistener;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;public class            tlclientdelete {public static void main (string[] args) {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 (Treelistener.c_path);           if (stat! = null) {             Client.delete (). deletingchildrenifneeded (). Forpath (Treelistener.c_path);                } client.close ();                } catch (Exception e) {e.printstacktrace ();    }}). Start (); }}

Package Com.collonn.javautilmvn.zookeeper.curator.treecache;import Com.collonn.javautilmvn.zookeeper.curator.nodecache.nodelistener;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;public class Tlclientdeletesub {public static void main (string[] args) {new Thr EAD (New Runnable () {@Override public void run () {try {String Zo                    okeeperconnectionstring = "127.0.0.1:2181";                    Retrypolicy retrypolicy = new Exponentialbackoffretry (1000, 3);                    Curatorframework client = curatorframeworkfactory.newclient (zookeeperconnectionstring, Retrypolicy);                    Client.start (); Stat stat = client.checkexists (). Forpath (Treelistener.c_path + "/sub1");                    if (stat! = null) {Client.delete (). Forpath (Treelistener.c_path + "/sub1");                } client.close ();                } catch (Exception e) {e.printstacktrace ();    }}). Start (); }}

Package Com.collonn.javautilmvn.zookeeper.curator.treecache;import Com.collonn.javautilmvn.zookeeper.curator.nodecache.nodelistener;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;public class Tlclientupdate {public static void main (string[] args) {new Thread (New Runnable () {@Override public void run () {try {String Zooke                    eperconnectionstring = "127.0.0.1:2181";                    Retrypolicy retrypolicy = new Exponentialbackoffretry (1000, 3);                    Curatorframework client = curatorframeworkfactory.newclient (zookeeperconnectionstring, Retrypolicy);                    Client.start ();           Stat stat = client.checkexists (). Forpath (Treelistener.c_path);         if (stat! = null) {Client.setdata (). Forpath (Treelistener.c_path, "" ". GetBytes (Nodelisten Er.                    CHARSET));                } client.close ();                } catch (Exception e) {e.printstacktrace ();    }}). Start (); }}

Package Com.collonn.javautilmvn.zookeeper.curator.treecache;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;public class            tlclientupdatesub {public static void main (string[] args) {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 (Treelistener.c_path + "/sub1"); if (stat! = null) {Client.setdata (). Forpath (Treelistener.c_path + "/sub1", "GetBytes" (Treelistener.charset));                } client.close ();                } catch (Exception e) {e.printstacktrace ();    }}). Start (); }}

Apache curator Tree Cache Watcher