模拟两个客户端，实现多节点数据共享
1 package bjsxt.curator.cluster; 2 3 import org.apache.curator.RetryPolicy; 4 import org.apache.curator.framework.CuratorFramework; 5 import org.apache.curator.framework.CuratorFrameworkFactory; 6 import org.apache.curator.framework.recipes.cache.PathChildrenCache; 7 import org.apache.curator.framework.recipes.cache.PathChildrenCache.StartMode; 8 import org.apache.curator.framework.recipes.cache.PathChildrenCacheEvent; 9 import org.apache.curator.framework.recipes.cache.PathChildrenCacheListener; 10 import org.apache.curator.retry.ExponentialBackoffRetry; 11 import org.apache.zookeeper.CreateMode; 12 13 public class CuratorWatcher { 14 15 /** 父节点path */ 16 static final String PARENT_PATH = "/super"; 17 18 /** zookeeper服务器地址 */ 19 public static final String CONNECT_ADDR = "192.168.2.2:2181"; 20 /** 定义session失效时间 */ 21 22 public static final int SESSION_TIMEOUT = 30000; 23 24 public CuratorWatcher() throws Exception { 25 // 1 重试策略：初试时间为1s 重试10次 26 RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 10); 27 // 2 通过工厂创建连接 28 CuratorFramework cf = CuratorFrameworkFactory.builder() 29 .connectString(CONNECT_ADDR).sessionTimeoutMs(SESSION_TIMEOUT) 30 .retryPolicy(retryPolicy).build(); 31 // 3 建立连接 32 cf.start(); 33 34 // 4 创建跟节点 35 if (cf.checkExists().forPath(PARENT_PATH) == null) { 36 cf.create().withMode(CreateMode.PERSISTENT) 37 .forPath(PARENT_PATH, "super init".getBytes()); 38 } 39 40 // 4 建立一个PathChildrenCache缓存,第三个参数为是否接受节点数据内容 如果为false则不接受 41 PathChildrenCache cache = new PathChildrenCache(cf, PARENT_PATH, true); 42 // 5 在初始化的时候就进行缓存监听 43 cache.start(StartMode.POST_INITIALIZED_EVENT); 44 cache.getListenable().addListener(new PathChildrenCacheListener() { 45 /** 46 * <B>方法名称：</B>监听子节点变更<BR> 47 * <B>概要说明：</B>新建、修改、删除<BR> 48 * 49 * @see org.apache.curator.framework.recipes.cache.PathChildrenCacheListener#childEvent(org.apache.curator.framework.CuratorFramework, 50 * org.apache.curator.framework.recipes.cache.PathChildrenCacheEvent) 51 */ 52 @Override 53 public void childEvent(CuratorFramework cf, 54 PathChildrenCacheEvent event) throws Exception { 55 switch (event.getType()) { 56 case CHILD_ADDED: 57 System.out.println("CHILD_ADDED :" 58 + event.getData().getPath()); 59 System.out.println("CHILD_ADDED :" 60 + new String(event.getData().getData())); 61 break; 62 case CHILD_UPDATED: 63 System.out.println("CHILD_UPDATED :" 64 + event.getData().getPath()); 65 System.out.println("CHILD_UPDATED :" 66 + new String(event.getData().getData())); 67 break; 68 case CHILD_REMOVED: 69 System.out.println("CHILD_REMOVED :" 70 + event.getData().getPath()); 71 System.out.println("CHILD_REMOVED :" 72 + new String(event.getData().getData())); 73 break; 74 default: 75 break; 76 } 77 } 78 }); 79 } 80 81 }
package bjsxt.curator.cluster; public class Client1 { public static void main(String[] args) throws Exception { CuratorWatcher watcher = new CuratorWatcher(); System.out.println("c1 start..."); Thread.sleep(100000000); } }
package bjsxt.curator.cluster; public class Client2 { public static void main(String[] args) throws Exception { CuratorWatcher watcher = new CuratorWatcher(); System.out.println("c2 start..."); Thread.sleep(100000000); } }
在写一个测试类，
1 package bjsxt.curator.cluster; 2 3 import org.apache.curator.RetryPolicy; 4 import org.apache.curator.framework.CuratorFramework; 5 import org.apache.curator.framework.CuratorFrameworkFactory; 6 import org.apache.curator.retry.ExponentialBackoffRetry; 7 import org.apache.zookeeper.CreateMode; 8 9 public class Test { 10 11 /** zookeeper地址 */ 12 static final String CONNECT_ADDR = "192.168.2.2:2181"; 13 /** session超时时间 */ 14 static final int SESSION_OUTTIME = 5000;// ms 15 16 public static void main(String[] args) throws Exception { 17 18 // 1 重试策略：初试时间为1s 重试10次 19 RetryPolicy retryPolicy = new ExponentialBackoffRetry(1000, 10); 20 // 2 通过工厂创建连接 21 CuratorFramework cf = CuratorFrameworkFactory.builder() 22 .connectString(CONNECT_ADDR).sessionTimeoutMs(SESSION_OUTTIME) 23 .retryPolicy(retryPolicy).build(); 24 // 3 开启连接 25 cf.start(); 26 27 // Thread.sleep(3000); 28 // System.out.println(cf.getChildren().forPath("/super").get(0)); 29 30 // 4 创建节点 31 Thread.sleep(1000); 32 cf.create().creatingParentsIfNeeded().withMode(CreateMode.PERSISTENT) 33 .forPath("/super/c1", "c1内容".getBytes()); 34 Thread.sleep(1000); 35 cf.create().creatingParentsIfNeeded().withMode(CreateMode.PERSISTENT) 36 .forPath("/super/c2", "c2内容".getBytes()); 37 Thread.sleep(1000); 38 // 39 // 40 // 41 // //5 读取节点 42 // Thread.sleep(1000); 43 // String ret1 = new String(cf.getData().forPath("/super/c1")); 44 // System.out.println(ret1); 45 // 46 // 47 // //6 修改节点 48 Thread.sleep(1000); 49 cf.setData().forPath("/super/c2", "修改的新c2内容".getBytes()); 50 String ret2 = new String(cf.getData().forPath("/super/c2")); 51 System.out.println(ret2); 52 // 53 // 54 // 55 // //7 删除节点 56 // Thread.sleep(1000); 57 // cf.delete().forPath("/super/c1"); 58 59 } 60 }
运行代码后，可以看到Client1和Client2，监听，获取到节点的数据变化。
