zookeeper入门之Curator的使用之几种监听器的使用

package com.git.zookeeper.passwordmanager.listener;  
  
import java.util.ArrayList;  
import java.util.List;  
import java.util.concurrent.ExecutorService;  
import java.util.concurrent.Executors;  
  
import org.apache.curator.RetryPolicy;  
import org.apache.curator.framework.CuratorFramework;  
import org.apache.curator.framework.CuratorFrameworkFactory;  
import org.apache.curator.framework.api.ACLProvider;  
import org.apache.curator.framework.api.CuratorEvent;  
import org.apache.curator.framework.api.CuratorListener;  
import org.apache.curator.framework.recipes.cache.ChildData;  
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.PathChildrenCache.StartMode;  
import org.apache.curator.framework.recipes.cache.PathChildrenCacheEvent;  
import org.apache.curator.framework.recipes.cache.PathChildrenCacheListener;  
import org.apache.curator.framework.recipes.cache.TreeCache;  
import org.apache.curator.framework.recipes.cache.TreeCacheEvent;  
import org.apache.curator.framework.recipes.cache.TreeCacheListener;  
import org.apache.curator.retry.ExponentialBackoffRetry;  
import org.apache.curator.retry.RetryNTimes;  
import org.apache.zookeeper.WatchedEvent;  
import org.apache.zookeeper.Watcher;  
import org.apache.zookeeper.ZooDefs;  
import org.apache.zookeeper.ZooDefs.Perms;  
import org.apache.zookeeper.data.ACL;  
import org.apache.zookeeper.data.Id;  
  
/** 
 * curator管理zookeeper的相关方法工具类 
 * @author songqinghu 
 * 要点: 
 * 1.连接的建立  (两种 OK--使用权限方式) 
 * 2.节点的管理操作,增删改查--层叠节点的操作(OK --设立命名空间) 
 * 3.节点的监听操作,和无限监听事件触发(OK --使用第三种方法) 
 * 4.节点的访问控制ACL操作,密码的添加,修改-->连接中设置 
 * 5.节点原子性操作 
 * 6.节点的分布式锁操作 
 * 7.分布式队列 
 */  
public class CuratorListenerUtils {  
  
    /** 
     * 先测试玩玩   
     * @描述:XXXXXXX 
     * @param args 
     * @return void 
     * @exception 
     * @createTime:2016年5月17日 
     * @author: songqinghu 
     * @throws Exception  
     */   
    public static void main(String[] args) throws Exception {  
        CuratorFramework client = clientTwo();  
        //setListenterDateNode();  
        //setListenterThreeOne(client);  
       // setListenterThreeTwo(client);  
        setListenterThreeThree(client);  
       // getDataNode(client, "/two");  
       // setDataNode(client, "/two", "sss");  
        Thread.sleep(Long.MAX_VALUE);  
    }  
  
    /** 
     *  
     * @描述:创建一个zookeeper连接---连接方式一: 最简单的连接 
     * @return void 
     * @exception 
     * @createTime:2016年5月17日 
     * @author: songqinghu 
     */  
    private static CuratorFramework clientOne(){  
        //zk 地址  
        String connectString = "10.125.2.44:2181";  
        // 连接时间 和重试次数  
        RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 3);  
        CuratorFramework client = CuratorFrameworkFactory.newClient(connectString, retryPolicy);  
        client.start();  
        return client;  
    }  
      
    /** 
     *  
     * @描述:创建一个zookeeper连接---连接方式二:优选这个 
     * @return void 
     * @exception 
     * @createTime:2016年5月17日 
     * @author: songqinghu 
     */  
    private static CuratorFramework clientTwo(){  
  
        //默认创建的根节点是没有做权限控制的--需要自己手动加权限???----  
        ACLProvider aclProvider = new ACLProvider() {  
            private List<ACL> acl ;  
            @Override  
            public List<ACL> getDefaultAcl() {  
                if(acl ==null){  
                    ArrayList<ACL> acl = ZooDefs.Ids.CREATOR_ALL_ACL;  
                    acl.clear();  
                    acl.add(new ACL(Perms.ALL, new Id("auth", "admin:admin") ));  
                    this.acl = acl;  
                }  
                return acl;  
            }  
            @Override  
            public List<ACL> getAclForPath(String path) {  
                return acl;  
            }  
        };  
        String scheme = "digest";  
        byte[] auth = "admin:admin".getBytes();  
        int connectionTimeoutMs = 5000;  
        String connectString = "10.125.2.44:2181";  
        String namespace = "testnamespace";  
        CuratorFramework client = CuratorFrameworkFactory.builder().aclProvider(aclProvider).  
        authorization(scheme, auth).  
        connectionTimeoutMs(connectionTimeoutMs).  
        connectString(connectString).  
        namespace(namespace).  
        retryPolicy(new RetryNTimes(Integer.MAX_VALUE, 1000)).build();  
        client.start();  
        return client;  
    }  
      
      
    /** 
     *  
     * @描述:第一种监听器的添加方式: 对指定的节点进行添加操作 
     * 仅仅能监控指定的本节点的数据修改,删除 操作 并且只能监听一次 --->不好 
     * @return void 
     * @exception 
     * @createTime:2016年5月18日 
     * @author: songqinghu 
     * @throws Exception  
     */  
    private static void setListenterOne(CuratorFramework client) throws Exception{  
     // 注册观察者,当节点变动时触发    
        byte[] data = client.getData().usingWatcher(new Watcher() {  
            @Override  
            public void process(WatchedEvent event) {  
                System.out.println("获取 two 节点 监听器 : " + event);  
            }  
        }).forPath("/two");  
        System.out.println("two 节点数据: "+ new String(data));  
    }  
    /** 
     *  
     * @描述:第二种监听器的添加方式:  
     * 也是一次性的监听操作,使用后就无法在继续监听了 
     * @return void 
     * @exception 
     * @createTime:2016年5月18日 
     * @author: songqinghu 
     * @throws Exception  
     */  
    private static void setListenterTwo(CuratorFramework client) throws Exception{  
  
        ExecutorService pool = Executors.newCachedThreadPool();  
          
         CuratorListener listener = new CuratorListener() {  
            @Override  
            public void eventReceived(CuratorFramework client, CuratorEvent event) throws Exception {  
                System.out.println("监听器  : "+ event.toString());  
            }  
        };  
        client.getCuratorListenable().addListener(listener,pool);  
        client.getData().inBackground().forPath("/two");  
        client.getData().inBackground().forPath("/two");  
        client.getData().inBackground().forPath("/two");  
        client.getData().inBackground().forPath("/two");  
        Thread.sleep(Long.MAX_VALUE );  
    }  
    /** 
     *  
     * @描述:第三种监听器的添加方式: Cache 的三种实现 实践 
     *   Path Cache:监视一个路径下1)孩子结点的创建、2)删除,3)以及结点数据的更新。 
     *                  产生的事件会传递给注册的PathChildrenCacheListener。 
     *  Node Cache:监视一个结点的创建、更新、删除,并将结点的数据缓存在本地。 
     *  Tree Cache:Path Cache和Node Cache的“合体”,监视路径下的创建、更新、删除事件,并缓存路径下所有孩子结点的数据。 
     * @return void 
     * @exception 
     * @createTime:2016年5月18日 
     * @author: songqinghu 
     * @throws Exception  
     */  
    //1.path Cache  连接  路径  是否获取数据  
    //能监听所有的字节点 且是无限监听的模式 但是 指定目录下节点的子节点不再监听  
    private static void setListenterThreeOne(CuratorFramework client) throws Exception{  
        ExecutorService pool = Executors.newCachedThreadPool();  
        PathChildrenCache childrenCache = new PathChildrenCache(client, "/test", true);  
        PathChildrenCacheListener childrenCacheListener = new PathChildrenCacheListener() {  
            @Override  
            public void childEvent(CuratorFramework client, PathChildrenCacheEvent event) throws Exception {  
                System.out.println("开始进行事件分析:-----");  
                ChildData data = event.getData();  
                switch (event.getType()) {  
                case CHILD_ADDED:  
                    System.out.println("CHILD_ADDED : "+ data.getPath() +"  数据:"+ data.getData());  
                    break;  
                case CHILD_REMOVED:  
                    System.out.println("CHILD_REMOVED : "+ data.getPath() +"  数据:"+ data.getData());  
                    break;  
                case CHILD_UPDATED:  
                    System.out.println("CHILD_UPDATED : "+ data.getPath() +"  数据:"+ data.getData());  
                    break;  
                default:  
                    break;  
                }  
            }  
        };  
        childrenCache.getListenable().addListener(childrenCacheListener);  
        System.out.println("Register zk watcher successfully!");  
        childrenCache.start(StartMode.POST_INITIALIZED_EVENT);  
    }  
      
    //2.Node Cache  监控本节点的变化情况   连接 目录 是否压缩  
    //监听本节点的变化  节点可以进行修改操作  删除节点后会再次创建(空节点)  
    private static void setListenterThreeTwo(CuratorFramework client) throws Exception{  
        ExecutorService pool = Executors.newCachedThreadPool();  
        //设置节点的cache  
       final  NodeCache nodeCache = new NodeCache(client, "/test", false);  
        nodeCache.getListenable().addListener(new NodeCacheListener() {  
            @Override  
            public void nodeChanged() throws Exception {  
                System.out.println("the test node is change and result is :");  
                System.out.println("path : "+nodeCache.getCurrentData().getPath());  
                System.out.println("data : "+new String(nodeCache.getCurrentData().getData()));  
                System.out.println("stat : "+nodeCache.getCurrentData().getStat());  
            }  
        });  
        nodeCache.start();  
    }  
    //3.Tree Cache    
    // 监控 指定节点和节点下的所有的节点的变化--无限监听  可以进行本节点的删除(不在创建)  
    private static void setListenterThreeThree(CuratorFramework client) throws Exception{  
        ExecutorService pool = Executors.newCachedThreadPool();  
        //设置节点的cache  
        TreeCache treeCache = new TreeCache(client, "/test");  
        //设置监听器和处理过程  
        treeCache.getListenable().addListener(new TreeCacheListener() {  
            @Override  
            public void childEvent(CuratorFramework client, TreeCacheEvent event) throws Exception {  
                ChildData data = event.getData();  
                if(data !=null){  
                    switch (event.getType()) {  
                    case NODE_ADDED:  
                        System.out.println("NODE_ADDED : "+ data.getPath() +"  数据:"+ new String(data.getData()));  
                        break;  
                    case NODE_REMOVED:  
                        System.out.println("NODE_REMOVED : "+ data.getPath() +"  数据:"+ new String(data.getData()));  
                        break;  
                    case NODE_UPDATED:  
                        System.out.println("NODE_UPDATED : "+ data.getPath() +"  数据:"+ new String(data.getData()));  
                        break;  
                          
                    default:  
                        break;  
                    }  
                }else{  
                    System.out.println( "data is null : "+ event.getType());  
                }  
            }  
        });  
        //开始监听  
        treeCache.start();  
          
    }  
   
}  

 

posted @ 2018-05-09 14:10  牧之丨  阅读(416)  评论(0编辑  收藏  举报