Apache Curator Tree Cache Watcher

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可以监控某一路径下的子结点(所有子结节，不管有多少层子结点)变化。

比NodeCache方便的是，可以监听一群结点，而不用一个节点一个节点的去设置监听

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(2000);        TLClientUpdate.main(null);        Thread.sleep(2000);        TLClientCreateSub.main(null);        Thread.sleep(2000);        TLClientUpdateSub.main(null);        Thread.sleep(2000);        TLClientDeleteSub.main(null);        Thread.sleep(2000);        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 = "127.0.0.1:2181";                        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.println("===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 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.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 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.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 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.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 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.setData().forPath(TreeListener.C_PATH, "64".getBytes(NodeListener.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", "128".getBytes(TreeListener.CHARSET));                    }                    client.close();                } catch (Exception e) {                    e.printStackTrace();                }            }        }).start();    }}

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