ZooKeeper(3.4.5) - 原生 API 的简单示例
2024-04-29 01:50:42
一、创建会话
1. 创建一个基本的ZooKeeper会话实例
package com.huey.dream.demo;import java.util.concurrent.CountDownLatch;import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.Watcher.Event.KeeperState;/*** 创建一个基本的ZooKeeper会话实例* @author huey* @version 1.0 * @created 2015-3-1*/
public class ZKDemo {public static void main(String[] args) throws Exception {final CountDownLatch connectedSignal = new CountDownLatch(1);/*** ZooKeeper客户端和服务器会话的建立是一个异步的过程* 构造函数在处理完客户端的初始化工作后立即返回，在大多数情况下，并没有真正地建立好会话* 当会话真正创建完毕后，Zookeeper服务器会向客户端发送一个事件通知*/ZooKeeper zk = new ZooKeeper("192.168.1.109:2181", 5000, new Watcher() { @Overridepublic void process(WatchedEvent event) {if (event.getState() == KeeperState.SyncConnected) {connectedSignal.countDown();}}});System.out.println("State1: " + zk.getState()); // CONNECTING
connectedSignal.await(); System.out.println("State2: " + zk.getState()); // CONNECTED
zk.close();System.out.println("State3: " + zk.getState()); // CLOSED
}}2. 创建一个复用sessionId和sessionPasswd的Zookeeper对象示例
package com.huey.dream.demo;import java.util.concurrent.CountDownLatch;import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.Watcher.Event.KeeperState;/*** 创建一个复用sessionId和sessionPasswd的ZooKeeper对象示例* @author huey* @version 1.0 * @created 2015-3-1*/
public class ZKDemo {public static void main(String[] args) throws Exception {final CountDownLatch connectedSignal = new CountDownLatch(1); ZooKeeper zk = new ZooKeeper("192.168.1.109:2181", 5000, new Watcher() { @Overridepublic void process(WatchedEvent event) {if (event.getState() == KeeperState.SyncConnected) {connectedSignal.countDown();}}});connectedSignal.await();long sessionId = zk.getSessionId();byte[] passwd = zk.getSessionPasswd();zk.close();final CountDownLatch anotherConnectedSignal = new CountDownLatch(1);ZooKeeper newZk = new ZooKeeper("192.168.1.109:2181", 5000, new Watcher() {@Overridepublic void process(WatchedEvent event) {if (event.getState() == KeeperState.SyncConnected) {anotherConnectedSignal.countDown();}}},sessionId, passwd);anotherConnectedSignal.await();newZk.close();}}二、创建节点
1. 使用同步API创建一个ZNode节点
package com.huey.dream.demo;import java.util.concurrent.CountDownLatch;import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.apache.zookeeper.ZooDefs.Ids;/*** 使用同步API创建一个ZNode节点* @author huey* @version 1.0 * @created 2015-3-1*/
public class ZKDemo {public static void main(String[] args) throws Exception {final CountDownLatch connectedSignal = new CountDownLatch(1); ZooKeeper zk = new ZooKeeper("192.168.1.109:2181", 5000, new Watcher() { @Overridepublic void process(WatchedEvent event) {if (event.getState() == KeeperState.SyncConnected) {connectedSignal.countDown();}}});connectedSignal.await();String path = zk.create("/zk-huey", "hello".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);System.out.println(path + " is created.");zk.close();}}2. 使用异步API创建一个ZNode节点
package com.huey.dream.demo;import java.util.concurrent.CountDownLatch;import org.apache.zookeeper.AsyncCallback;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.apache.zookeeper.ZooDefs.Ids;/*** 使用异步API创建一个ZNode节点* @author huey* @version 1.0 * @created 2015-3-1*/
public class ZKDemo {public static void main(String[] args) throws Exception {final CountDownLatch connectedSignal = new CountDownLatch(1); ZooKeeper zk = new ZooKeeper("192.168.1.109:2181", 5000, new Watcher() { @Overridepublic void process(WatchedEvent event) {if (event.getState() == KeeperState.SyncConnected) {connectedSignal.countDown();}}});connectedSignal.await();zk.create("/zk-huey", "hello".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT_SEQUENTIAL,new AsyncCallback.StringCallback() {@Overridepublic void processResult(int rc, String path, Object ctx, String name) {// 服务器响应吗System.out.println("ResultCode: " + rc);// 接口调用时传入API的数据节点的路径参数值System.out.println("Znode: " + path);// 接口调用时传入API的ctx参数值System.out.println("Context: " + (String)ctx);// 实际在服务端创建的节点名System.out.println("Real Path: " + name);}},"The Context");zk.close();}}三、删除节点
1. 使用同API删除一个ZNode节点
package com.huey.dream.demo;import java.util.concurrent.CountDownLatch;import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.Watcher.Event.KeeperState;/*** 使用同步API删除一个ZNode节点* @author huey* @version 1.0 * @created 2015-3-1*/
public class ZKDemo {public static void main(String[] args) throws Exception {final CountDownLatch connectedSignal = new CountDownLatch(1); ZooKeeper zk = new ZooKeeper("192.168.1.109:2181", 5000, new Watcher() { @Overridepublic void process(WatchedEvent event) {if (event.getState() == KeeperState.SyncConnected) {connectedSignal.countDown();}}});connectedSignal.await();zk.delete("/zk-huey", -1);zk.close();}}2. 使用异步API删除一个ZNode节点
package com.huey.dream.demo;import java.util.concurrent.CountDownLatch;import org.apache.zookeeper.AsyncCallback;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.Watcher.Event.KeeperState;/*** 使用异步API删除一个ZNode节点* @author huey* @version 1.0 * @created 2015-3-1*/
public class ZKDemo {public static void main(String[] args) throws Exception {final CountDownLatch connectedSignal = new CountDownLatch(1); ZooKeeper zk = new ZooKeeper("192.168.1.109:2181", 5000, new Watcher() { @Overridepublic void process(WatchedEvent event) {if (event.getState() == KeeperState.SyncConnected) {connectedSignal.countDown();}}});connectedSignal.await();zk.delete("/zk-huey", -1,new AsyncCallback.VoidCallback() {@Overridepublic void processResult(int rc, String path, Object ctx) {System.out.println("ResultCode: " + rc);System.out.println("Znode: " + path);System.out.println("Context: " + (String)ctx);}},"The Context");zk.close();}}四、获取子节点列表
1. 使用同步API获取子节点列表
package com.huey.dream.demo;import java.util.List;
import java.util.concurrent.CountDownLatch;import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.Watcher.Event.EventType;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.data.Stat;/*** 使用同步API获取子节点列表* @author huey* @version 1.0 * @created 2015-3-1*/
public class ZKDemo {public static void main(String[] args) throws Exception {final CountDownLatch connectedSignal = new CountDownLatch(1);final ZooKeeper zk = new ZooKeeper("192.168.1.109:2182", 5000, null);zk.register(new Watcher() { @Overridepublic void process(WatchedEvent event) {if (event.getState() == KeeperState.SyncConnected) {if (event.getType() == EventType.None&& event.getPath() == null) {connectedSignal.countDown();} else if (event.getType() == EventType.NodeChildrenChanged) { try {System.out.println("NodeChildrenChanged.");List<String> children = zk.getChildren(event.getPath(), true);System.out.println("Children: " + children);} catch (KeeperException e) {e.printStackTrace();} catch (InterruptedException e) {e.printStackTrace();}}}}});connectedSignal.await();zk.create("/zk-huey", "root".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);zk.create("/zk-huey/node1", "node1".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);zk.create("/zk-huey/node2", "node2".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);Stat stat = new Stat();List<String> children = zk.getChildren("/zk-huey", true, // 注册默认的Watcher，当子节点类别发送变更的话，向客户端发送通知stat // 用于描述节点状态信息
);System.out.println("Stat: " + stat);System.out.println("Children: " + children);zk.create("/zk-huey/node3", "node3".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);Thread.sleep(10 * 1000);zk.close();}}结果输出：
Stat: 4294967436,4294967436,1425201236879,1425201236879,0,2,0,0,4,2,4294967438Children: [node2, node1] NodeChildrenChanged. State: CONNECTED Children: [node2, node3, node1]
2. 使用异步API获取子节点列表
package com.huey.dream.demo;import java.util.List;
import java.util.concurrent.CountDownLatch;import org.apache.zookeeper.AsyncCallback;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.Watcher.Event.EventType;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.data.Stat;/*** 使用异步API获取子节点列表* @author huey* @version 1.0 * @created 2015-3-1*/
public class ZKDemo {public static void main(String[] args) throws Exception {final CountDownLatch connectedSignal = new CountDownLatch(1);final ZooKeeper zk = new ZooKeeper("192.168.1.109:2182", 5000, null);zk.register(new Watcher() { @Overridepublic void process(WatchedEvent event) {if (event.getState() == KeeperState.SyncConnected) {if (event.getType() == EventType.None&& event.getPath() == null) {connectedSignal.countDown();} else if (event.getType() == EventType.NodeChildrenChanged) { try {System.out.println("NodeChildrenChanged.");List<String> children = zk.getChildren(event.getPath(), true);System.out.println("Children: " + children);} catch (KeeperException e) {e.printStackTrace();} catch (InterruptedException e) {e.printStackTrace();}}}}});connectedSignal.await();zk.create("/zk-huey", "root".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);zk.create("/zk-huey/node1", "node1".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);zk.create("/zk-huey/node2", "node2".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);zk.getChildren("/zk-huey", true,new AsyncCallback.Children2Callback() {@Overridepublic void processResult(int rc, String path, Object ctx,List<String> children, Stat stat) {System.out.println("ResultCode: " + rc);System.out.println("ZNode: " + path);System.out.println("Context: " + ctx);System.out.println("Children: " + children);System.out.println("Stat: " + stat);}},"The Context");zk.create("/zk-huey/node3", "node3".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);Thread.sleep(10 * 1000);zk.close();}}五、获取节点数据内容
1. 使用同步API获取节点数据内容
package com.huey.dream.demo;import java.util.concurrent.CountDownLatch;import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.Watcher.Event.EventType;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.apache.zookeeper.ZooDefs.Ids;/*** 使用同步API获取节点数据内容* @author huey* @version 1.0 * @created 2015-3-1*/
public class ZKDemo {public static void main(String[] args) throws Exception {final CountDownLatch connectedSignal = new CountDownLatch(1);final ZooKeeper zk = new ZooKeeper("192.168.1.109:2182", 5000, new Watcher() { @Overridepublic void process(WatchedEvent event) {if (event.getState() == KeeperState.SyncConnected) {if (event.getType() == EventType.None&& event.getPath() == null) {connectedSignal.countDown();}}}});connectedSignal.await();zk.create("/zk-huey", "hello".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);byte[] nodeData = zk.getData("/zk-huey", false, null);System.out.println("NodeData: " + new String(nodeData));zk.close();}}2. 使用异步API获取节点数据内容
package com.huey.dream.demo;import java.util.concurrent.CountDownLatch;import org.apache.zookeeper.AsyncCallback;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.Watcher.Event.EventType;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.data.Stat;/*** 使用异步API获取节点数据内容* @author huey* @version 1.0 * @created 2015-3-1*/
public class ZKDemo {public static void main(String[] args) throws Exception {final CountDownLatch connectedSignal = new CountDownLatch(1);final ZooKeeper zk = new ZooKeeper("192.168.1.109:2182", 5000, new Watcher() { @Overridepublic void process(WatchedEvent event) {if (event.getState() == KeeperState.SyncConnected) {if (event.getType() == EventType.None&& event.getPath() == null) {connectedSignal.countDown();}}}});connectedSignal.await();zk.create("/zk-huey", "hello".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);zk.getData("/zk-huey", false, new AsyncCallback.DataCallback() {@Overridepublic void processResult(int rc, String path, Object ctx, byte[] data,Stat stat) {System.out.println("ResultCode: " + rc);System.out.println("ZNode: " + path);System.out.println("Context: " + ctx);System.out.println("NodeData: " + new String(data));System.out.println("Stat: " + stat);}},"The Context");zk.close();}}六、更新数据
1. 使用同步API更新节点数据内容
package com.huey.dream.demo;import java.util.concurrent.CountDownLatch;import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.Watcher.Event.EventType;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.apache.zookeeper.ZooDefs.Ids;/*** 使用同步API更新节点数据内容* @author huey* @version 1.0 * @created 2015-3-1*/
public class ZKDemo {public static void main(String[] args) throws Exception {final CountDownLatch connectedSignal = new CountDownLatch(1);final ZooKeeper zk = new ZooKeeper("192.168.1.109:2182", 5000, new Watcher() { @Overridepublic void process(WatchedEvent event) {if (event.getState() == KeeperState.SyncConnected) {if (event.getType() == EventType.None&& event.getPath() == null) {connectedSignal.countDown();}}}});connectedSignal.await();zk.create("/zk-huey", "hello".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);byte[] nodeData = zk.getData("/zk-huey", false, null);System.out.println("NodeData: " + nodeData);zk.setData("/zk-huey", "world".getBytes(), -1);nodeData = zk.getData("/zk-huey", false, null);System.out.println("NodeData: " + nodeData);zk.close();}}2. 使用异步API更新节点数据内容
package com.huey.dream.demo;import java.util.concurrent.CountDownLatch;import org.apache.zookeeper.AsyncCallback;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.Watcher.Event.EventType;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.data.Stat;/*** 使用异步API更新节点数据内容* @author huey* @version 1.0 * @created 2015-3-1*/
public class ZKDemo {public static void main(String[] args) throws Exception {final CountDownLatch connectedSignal = new CountDownLatch(1);final ZooKeeper zk = new ZooKeeper("192.168.1.109:2182", 5000, new Watcher() { @Overridepublic void process(WatchedEvent event) {if (event.getState() == KeeperState.SyncConnected) {if (event.getType() == EventType.None&& event.getPath() == null) {connectedSignal.countDown();}}}});connectedSignal.await();zk.create("/zk-huey", "hello".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);byte[] nodeData = zk.getData("/zk-huey", false, null);System.out.println("NodeData: " + nodeData);zk.setData("/zk-huey", "world".getBytes(), -1,new AsyncCallback.StatCallback() {@Overridepublic void processResult(int rc, String path, Object ctx, Stat stat) {System.out.println("ResultCode: " + rc);System.out.println("ZNode: " + path);System.out.println("Context: " + ctx);System.out.println("Stat: " + stat);}},"The Context");zk.close();}}七、判断节点是否存在
1. 使用同步API判断节点是否存在
package com.huey.dream.demo;import java.util.concurrent.CountDownLatch;import org.apache.zookeeper.AsyncCallback;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.Watcher.Event.EventType;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.data.Stat;/*** 使用同步API判断节点是否存在* @author huey* @version 1.0 * @created 2015-3-1*/
public class ZKDemo {public static void main(String[] args) throws Exception {final CountDownLatch connectedSignal = new CountDownLatch(1);final ZooKeeper zk = new ZooKeeper("192.168.1.109:2182", 5000, new Watcher() { @Overridepublic void process(WatchedEvent event) {if (event.getState() == KeeperState.SyncConnected) {if (event.getType() == EventType.None&& event.getPath() == null) {connectedSignal.countDown();}}}});connectedSignal.await();Stat stat = zk.exists("/zk-huey", false);if (stat == null) {zk.create("/zk-huey", "hello".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);} else {System.out.println("Stat: " + stat);}zk.close();}}2. 使用异步API判断节点是否存在
package com.huey.dream.demo;import java.util.concurrent.CountDownLatch;import org.apache.zookeeper.AsyncCallback;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.Watcher.Event.EventType;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.apache.zookeeper.data.Stat;/*** 使用异步API判断节点是否存在* @author huey* @version 1.0 * @created 2015-3-1*/
public class ZKDemo {public static void main(String[] args) throws Exception {final CountDownLatch connectedSignal = new CountDownLatch(1);final ZooKeeper zk = new ZooKeeper("192.168.1.109:2182", 5000, new Watcher() { @Overridepublic void process(WatchedEvent event) {if (event.getState() == KeeperState.SyncConnected) {if (event.getType() == EventType.None&& event.getPath() == null) {connectedSignal.countDown();}}}});connectedSignal.await();zk.exists("/zk-huey", false,new AsyncCallback.StatCallback() {@Overridepublic void processResult(int rc, String path, Object ctx, Stat stat) {System.out.println("ResultCode: " + rc);System.out.println("ZNode: " + path);System.out.println("Context: " + ctx);System.out.println("Stat: " + stat);}},"The Context");zk.close();}}八、权限控制
package com.huey.dream.demo;import java.util.concurrent.CountDownLatch;import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.ZooDefs.Ids;/*** ZooKeeper权限控制* @author huey* @version 1.0 * @created 2015-3-1*/
public class ZKDemo {public static void main(String[] args) throws Exception {/*** 使用含有权限信息的zookeeper会话创建数据节点*/final CountDownLatch connectedSignal = new CountDownLatch(1);ZooKeeper zk = new ZooKeeper("192.168.1.109:2182", 5000, new Watcher() {@Overridepublic void process(WatchedEvent event) {connectedSignal.countDown();}});connectedSignal.await();zk.addAuthInfo("digest", "huey:123".getBytes());zk.create("/zk-huey", "hello".getBytes(), Ids.CREATOR_ALL_ACL, CreateMode.PERSISTENT);zk.close();/*** 使用无权限信息的zookeeper会话访问含有权限信息的数据节点*/try {final CountDownLatch signal = new CountDownLatch(1);ZooKeeper zk1 = new ZooKeeper("192.168.1.109:2182", 5000, new Watcher() {@Overridepublic void process(WatchedEvent event) {signal.countDown();}});signal.await();zk1.getData("/zk-huey", false, null);System.out.println("NodeData: " + new String(zk1.getData("/zk-huey", false, null)));zk1.close();} catch (Exception e) {System.out.println("Failed to delete Znode: " + e.getMessage());}/*** 使用错误权限信息的zookeeper会话访问含有权限信息的数据节点*/try {final CountDownLatch signal = new CountDownLatch(1);ZooKeeper zk2 = new ZooKeeper("192.168.1.109:2182", 5000, new Watcher() {@Overridepublic void process(WatchedEvent event) {signal.countDown();}});signal.await();zk2.addAuthInfo("digest", "huey:abc".getBytes());System.out.println("NodeData: " + new String(zk2.getData("/zk-huey", false, null)));zk2.close();} catch (Exception e) {System.out.println("Failed to delete Znode: " + e.getMessage());}/*** 使用正确权限信息的zookeeper会话访问含有权限信息的数据节点*/try {final CountDownLatch signal = new CountDownLatch(1);ZooKeeper zk3 = new ZooKeeper("192.168.1.109:2182", 5000, new Watcher() {@Overridepublic void process(WatchedEvent event) {signal.countDown();}});signal.await();zk3.addAuthInfo("digest", "huey:123".getBytes());System.out.println("NodeData: " + new String(zk3.getData("/zk-huey", false, null)));zk3.close();} catch (Exception e) {System.out.println("Failed to delete Znode: " + e.getMessage());}}}结果输出：
Failed to delete Znode: KeeperErrorCode = NoAuth for /zk-huey Failed to delete Znode: KeeperErrorCode = NoAuth for /zk-huey NodeData: hello
转载于:https://www.cnblogs.com/huey/p/4307056.html
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