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(); } }