zookeeper 工具类以及利用InterProcessLock 创建分布式锁

有些接口未测试;待后续优化 分布式锁可参考http://surlymo.iteye.com/blog/2082684 实现
package com.ai.runner.test.lock;

import java.util.List;
import java.util.concurrent.TimeUnit;

import org.apache.commons.lang.StringUtils;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.api.ACLBackgroundPathAndBytesable;
import org.apache.curator.framework.api.BackgroundPathAndBytesable;
import org.apache.curator.framework.api.BackgroundPathable;
import org.apache.curator.framework.imps.CuratorFrameworkState;
import org.apache.curator.framework.recipes.locks.InterProcessLock;
import org.apache.curator.framework.recipes.locks.InterProcessMutex;
import org.apache.curator.retry.RetryNTimes;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooDefs;
import org.apache.zookeeper.data.ACL;
import org.apache.zookeeper.data.Stat;


/**
 * Date: 2016年5月28日 
* * @author zhoushanbin */ public class ZkClient { private String zkAddr; private int timeOut; private String authSchema; private String authInfo; private CuratorFramework client; public ZkClient(String zkAddr, int timeOut, String namespace) throws Exception{ this(zkAddr,timeOut,namespace,null); } /** * 获取zk 连接客户端 * @param zkAddr zk地址 ip:port,ip:port,ip:port * @param timeOut 连接超时ms * @param namespace 所有的操作都是在 /namespace 下的节点操作 * @param acl Access Control List(访问控制列表)。Znode被创建时带有一个ACL列表
* acl 主要由三个维度:schema,id,permision 控制节点权限
* eg:
* Id id = new Id("digest", DigestAuthenticationProvider.generateDigest("username:password"));
* ACL acl = new ACL(ZooDefs.Perms.ALL, id);
*
* 维度 schema:
* 1:digest 用户名+密码验证 它对应的维度id=username:BASE64(SHA1(password))
* 2:host 客户端主机名hostname验证
* 3:ip 它对应的维度id=客户机的IP地址,设置的时候可以设置一个ip段,比如ip:192.168.1.0/16, 表示匹配前16个bit的IP段
* 4:auth 使用sessionID验证
* 5:world 无验证,默认是无任何权限 它下面只有一个id, 叫anyone
* 6:super: 在这种scheme情况下,对应的id拥有超级权限,可以做任何事情(cdrwa)
* 7:sasl: sasl的对应的id,是一个通过了kerberos认证的用户id
*
* 维度:permision
* ZooDefs.Perms.READ 读权限
* ZooDefs.Perms.WRITE 写权限
* ZooDefs.Perms.CREATE 创建节点权限
* ZooDefs.Perms.DELETE 删除节点权限
* ZooDefs.Perms.ADMIN 能设置权限
* ZooDefs.Perms.ALL 所有权限
* ALL = READ | WRITE | CREATE | DELETE | ADMIN
* @throws Exception */ public ZkClient(String zkAddr, int timeOut, String namespace,ACL acl) throws Exception{ this.zkAddr = zkAddr; if (timeOut > 0) { this.timeOut = timeOut; } if (null != acl) { this.authSchema = acl.getId().getScheme(); this.authInfo = acl.getId().getId(); } CuratorFrameworkFactory.Builder builder = CuratorFrameworkFactory .builder().connectString(this.zkAddr).namespace(StringUtils.isEmpty(namespace)?"":namespace) .connectionTimeoutMs(this.timeOut) .retryPolicy(new RetryNTimes(5, 10)); if ((!StringUtils.isBlank(this.authSchema)) && (!StringUtils.isBlank(this.authInfo))) { builder.authorization(this.authSchema, this.authInfo.getBytes()); } this.client = builder.build(); this.client.start(); this.client.blockUntilConnected(5, TimeUnit.SECONDS); } /** * 创建一个所有权限节点即schema:world;id:annyone;permision:ZooDefs.Perms.ALL * @param nodePath 创建的结点路径 * @param data 节点数据 * @param createMode 节点模式 * @param recursion 当父目录不存在是否创建 true:创建,fasle:不创建 * @throws Exception */ public void createNode(String nodePath, String data, CreateMode createMode,boolean recursion) throws Exception { createNode(nodePath, ZooDefs.Ids.OPEN_ACL_UNSAFE, data, createMode,recursion); } /** * 创建节点 * @param nodePath 创建节点的路径 * @param acls 节点控制权限列表 * @param data 节点存放的数据 * @param createMode 创建节点的模式 * @param recursion 当父目录不存在是否创建 true:创建,fasle:不创建 * 节点模式CreateMode
* 1:CreateMode.EPHEMERAL 创建临时节点;该节点在客户端掉线的时候被删除
* 2:CreateMode.EPHEMERAL_SEQUENTIAL 临时自动编号节点,一旦创建这个节点的客户端与服务器端口也就是session 超时,这种节点会被自动删除,并且根据当前已近存在的节点数自动加 1,然后返回给客户端已经成功创建的目录节点(可做分布式锁)
* 3:CreateMode.PERSISTENT 持久化目录节点,存储的数据不会丢失。
* 4:CreateMode.PERSISTENT_SEQUENTIAL 顺序自动编号的持久化目录节点,存储的数据不会丢失,并且根据当前已近存在的节点数自动加 1,然后返回给客户端已经成功创建的目录节点名
* @throws Exception */ public void createNode(String nodePath, List acls, String data, CreateMode createMode,boolean recursion) throws Exception { byte[] bytes = null; if (!StringUtils.isBlank(data)) { bytes = data.getBytes("UTF-8"); } createNode(nodePath, acls, bytes, createMode,recursion); } /** * @param nodePath 创建节点的路径 * @param acls 节点控制权限列表 * @param data 节点存放的数据 * @param createMode 创建节点的模式 * @param recursion 当父目录不存在是否创建 true:创建,fasle:不创建 * 节点模式CreateMode
* 1:CreateMode.EPHEMERAL 创建临时节点;该节点在客户端掉线的时候被删除
* 2:CreateMode.EPHEMERAL_SEQUENTIAL 临时自动编号节点,一旦创建这个节点的客户端与服务器端口也就是session 超时,这种节点会被自动删除,并且根据当前已近存在的节点数自动加 1,然后返回给客户端已经成功创建的目录节点(可做分布式锁)
* 3:CreateMode.PERSISTENT 持久化目录节点,存储的数据不会丢失。
* 4:CreateMode.PERSISTENT_SEQUENTIAL 顺序自动编号的持久化目录节点,存储的数据不会丢失,并且根据当前已近存在的节点数自动加 1,然后返回给客户端已经成功创建的目录节点名
* @throws Exception */ public void createNode(String nodePath, List acls, byte[] data, CreateMode createMode,boolean recursion) throws Exception { if(recursion){ ((BackgroundPathAndBytesable) ((ACLBackgroundPathAndBytesable) this.client .create().creatingParentsIfNeeded().withMode(createMode)) .withACL(acls)).forPath(nodePath, data); } else{ ((BackgroundPathAndBytesable) ((ACLBackgroundPathAndBytesable) this.client .create().withMode(createMode)) .withACL(acls)).forPath(nodePath, data); } } /** * 创建一个所有权限的永久节点 * @param nodePath * @param data * @param recursion 当父目录不存在是否创建 true:创建,fasle:不创建 * @throws Exception */ public void createPersitentNode(String nodePath, String data,boolean recursion) throws Exception { createNode(nodePath, data, CreateMode.PERSISTENT,recursion); } /** * 创建一个所有权限的零时节点 * @param nodePath * @param data * @param recursion 当父目录不存在是否创建 true:创建,fasle:不创建 * @throws Exception */ public void createEphemeralNode(String nodePath, String data,boolean recursion) throws Exception { createNode(nodePath, data, CreateMode.EPHEMERAL,recursion); } /** * 创建一个带权限的永久节点 * @param nodePath * @param data * @param recursion 当父目录不存在是否创建 true:创建,fasle:不创建 * @throws Exception */ public void createPersitentNodeWithAcl(String nodePath, String data,List acls,boolean recursion) throws Exception { createNode(nodePath, acls, data, CreateMode.PERSISTENT,recursion); } /** * 创建一个带权限的零时节点 * @param nodePath * @param data * @param recursion 当父目录不存在是否创建 true:创建,fasle:不创建 * @throws Exception */ public void createEphemeralNodeAcl(String nodePath, String data,List acls,boolean recursion) throws Exception { createNode(nodePath, acls, data, CreateMode.EPHEMERAL,recursion); } /** * 创建序列节点且当父节点不存在时创建父节点 * @param nodePath * @param acls 可参考:ZooDefs.Ids * @param createMode * @param recursion 当父目录不存在是否创建 true:创建,fasle:不创建 * @throws Exception */ public void createSeqNode(String nodePath,List acls,CreateMode createMode,boolean recursion) throws Exception { if(recursion){ ((BackgroundPathAndBytesable) ((ACLBackgroundPathAndBytesable) this.client .create().creatingParentsIfNeeded() .withMode(createMode)) .withACL(acls)).forPath(nodePath); } else{ ((BackgroundPathAndBytesable) ((ACLBackgroundPathAndBytesable) this.client .create() .withMode(createMode)) .withACL(acls)).forPath(nodePath); } } /** * 存在返回 节点stat 信息;否则返回null * @param path * @return * @throws Exception */ public Stat exists(String path) throws Exception { return this.client.checkExists().forPath(path); } /** * 判断节点是否存在,存在则注册节点监视器 * @param path * @param watcher * @return */ public boolean exists(String path, Watcher watcher) throws Exception { if (null != watcher) { return null != ((BackgroundPathable) this.client.checkExists().usingWatcher(watcher)).forPath(path); } return null != this.client.checkExists().forPath(path); } /** * 判断是否处于连接状态 * @return */ public boolean isConnected() { if ((null == this.client) || (!CuratorFrameworkState.STARTED.equals(this.client .getState()))) { return false; } return true; } public void retryConnection() { this.client.start(); } /** * 获取连接客户端 * @return */ public CuratorFramework getInnerClient(){ return this.client; } /** * 关闭连接 */ public void quit() { if ((null != this.client) && (CuratorFrameworkState.STARTED .equals(this.client.getState()))) { this.client.close(); } } /** * 删除节点 * @param path * @param deleChildren * @throws Exception */ public void deleteNode(String path,boolean deleChildren) throws Exception { if(deleChildren){ this.client.delete().guaranteed().deletingChildrenIfNeeded() .forPath(path); } else{ this.client.delete().forPath(path); } } /** * 设置节点数据 * @param nodePath * @param data * @throws Exception */ public void setNodeData(String nodePath, String data) throws Exception { byte[] bytes = null; if (!StringUtils.isBlank(data)) { bytes = data.getBytes("UTF-8"); } setNodeData(nodePath, bytes); } /** * 设置节点数据 * @param nodePath * @param data * @throws Exception */ public void setNodeData(String nodePath, byte[] data) throws Exception { this.client.setData().forPath(nodePath, data); } public String getNodeData(String nodePath, boolean watch) throws Exception { byte[] data; if (watch) { data = (byte[]) ((BackgroundPathable) this.client.getData() .watched()).forPath(nodePath); } else { data = (byte[]) this.client.getData().forPath(nodePath); } if ((null == data) || (data.length <= 0)) { return null; } return new String(data, "UTF-8"); } public String getNodeData(String nodePath) throws Exception { return getNodeData(nodePath, false); } public String getNodeData(String nodePath, Watcher watcher) throws Exception { byte[] data = getNodeBytes(nodePath, watcher); return new String(data, "UTF-8"); } public byte[] getNodeBytes(String nodePath, Watcher watcher) throws Exception { byte[] bytes = null; if (null != watcher) { bytes = (byte[]) ((BackgroundPathable) this.client.getData() .usingWatcher(watcher)).forPath(nodePath); } else { bytes = (byte[]) this.client.getData().forPath(nodePath); } return bytes; } public byte[] getNodeBytes(String nodePath) throws Exception { return getNodeBytes(nodePath, null); } @SuppressWarnings("unchecked") public List getChildren(String nodePath, Watcher watcher) throws Exception { return (List) ((BackgroundPathable) this.client .getChildren().usingWatcher(watcher)).forPath(nodePath); } public List getChildren(String path) throws Exception { return (List) this.client.getChildren().forPath(path); } @SuppressWarnings("unchecked") public List getChildren(String path, boolean watcher) throws Exception { if (watcher) { return (List) ((BackgroundPathable) this.client .getChildren().watched()).forPath(path); } return (List) this.client.getChildren().forPath(path); } public ZkClient addAuth(String authSchema, String authInfo) throws Exception { synchronized (ZkClient.class) { this.client.getZookeeperClient().getZooKeeper() .addAuthInfo(authSchema, authInfo.getBytes()); } return this; } /** * 分布式锁 * @param lockPath * @return */ public InterProcessLock getInterProcessLock(String lockPath) { return new InterProcessMutex(this.client, lockPath); } }
package com.ai.runner.test.lock;

import org.apache.curator.framework.recipes.locks.InterProcessLock;
import org.apache.zookeeper.data.ACL;

/**
 * @date 2017年4月19日
 * @author zhoushanbin
 *
 */
public class ZkClientUtils {

	private static  ZkClient zkClient;
	
	public static ZkClient getZkClient(String zkAddr, int timeOut, String namespace,ACL acl) throws Exception{
		if(null != zkClient){
			return zkClient;
		}
		synchronized (ZkClientUtils.class) {
			if(null != zkClient){
				return zkClient;
			}
			zkClient = new ZkClient(zkAddr, timeOut, namespace, acl);
		}
		return zkClient;
	}
	
	
/*******************************************************************************************/	
	public static String address = "ip:29181";
	public static void main(String args[]){
		
		//testDistributeLock();
		testCreateNode();
	}
	
	
	
	public static void testAcl(){
		
	}
	
	public static void testCreateNode(){
		try {
			ZkClient zkClient = ZkClientUtils.getZkClient(address, 30, "ns", null);
			zkClient.createPersitentNode("/test/qaz/t2/t/t", "data", true);
			
		} catch (Exception e) {
			
			e.printStackTrace();
		}
	}
	
	public static void testDeleteNode(){
		
	}
	
	public static void testSetData(){
		
	}
	
	public static void testGetChildren(){
		
	}
	
	public static void testGetData(){
		
	}
	
	public static void testDistributeLock(){
		
		for(int i=0;i<50;i++){
			new Thread(){

				@Override
				public void run() {
					InterProcessLock lock = null;
					try{
						ZkClient zkClient = ZkClientUtils.getZkClient(address, 30, "dislock", null);
						lock = zkClient.getInterProcessLock("/distributeLock");
						System.out.println(Thread.currentThread().getName()+"申请锁");
						lock.acquire();
						System.out.println(Thread.currentThread().getName()+"持有锁");
						Thread.sleep(500);
					}
					catch(Exception e){
						e.printStackTrace();
					}
					finally{
						if(null != lock){
							try {
								lock.release();
								System.out.println(Thread.currentThread().getName()+"释放有锁");
							} catch (Exception e) {
								e.printStackTrace();
							}
						}
					}
				}
				
			}.start();
			
		}
	}
}


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