zookeeper中怎么实现分布式锁
zookeeper中怎么实现分布式锁，很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。
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一、理论基础
利用zk的临时有序节点机制实现分布式锁
zk节点的四种类型：持久节点、持久顺序节点、临时节点、临时顺序节点。
二、代码实现
1、资源类FakeLimitedResource
package com.lau.distributed.lock;
/**
* @ClassName: FakeLimitedResource
* @Description: TODO
* @author Liu
* @date 2021年4月17日 下午9:30:14
*/
public class FakeLimitedResource {
private Integer ticket = 250;
public void use(){
System.out.println("分布式锁-线程：" + Thread.currentThread().getName() + "卖了1张票，火车票还剩：" + (--ticket) + "张");
}
}2、资源控制类ExampleClientThatLocks（锁操作）
package com.lau.distributed.lock;
import java.util.concurrent.TimeUnit;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.recipes.locks.InterProcessMutex;
/**
* @ClassName: ExampleClientThatLocks
* @Description: TODO
* @author Liu
* @date 2021年4月17日 下午9:56:32
*/
public class ExampleClientThatLocks {
//锁对象
private final InterProcessMutex lock;
//火车票共享资源
private final FakeLimitedResource resource;
//客户端名称
private final String clientName;
public ExampleClientThatLocks(CuratorFramework client, String lockPath, FakeLimitedResource resource, String clientName) {
this.resource = resource;
this.clientName = clientName;
lock = new InterProcessMutex(client, lockPath);
}
public void doWork(long time, TimeUnit unit) throws Exception{
//尝试获取锁，过时不候（超时机制）
if(!lock.acquire(time, unit)) {
throw new IllegalStateException(clientName + "could not acquire the lock!");
}
try {
System.out.println(clientName + " has acquired the lock!");
resource.use();
}
finally {
System.out.println(clientName + " has released the lock!");
lock.release();
}
}
}3、测试类LockingExample
package com.lau.distributed.lock;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.retry.ExponentialBackoffRetry;
/**
* @ClassName: LockingExample
* @Description: TODO
* @author Liu
* @date 2021年4月17日 下午9:49:44
*/
public class LockingExample{
private static final int QTY = 5;
private static final int PERMISSIONS = 50;
private static final String CONNECTION_HOST = "192.168.1.106:2181";
private static final String PATH = "/lock";
public static void main(String[] args){
//模拟火车票一次只能由一个进程访问
final FakeLimitedResource resource = new FakeLimitedResource();
//定义默认初始化有5个线程的线程池
ExecutorService service = Executors.newFixedThreadPool(QTY);
try{
for(int i = 0; i < QTY; i++){
final int index = i;
Callable task = new Callable(){
public Void call() throws Exception{
//获取zk集群连接
CuratorFramework client = CuratorFrameworkFactory.newClient(CONNECTION_HOST,
new ExponentialBackoffRetry(1000, 3, Integer.MAX_VALUE));
try{
client.start();
ExampleClientThatLocks example = new ExampleClientThatLocks(client, PATH, resource, "client" + index);
//模拟一个线程卖50张票
for(int j = 0; j < PERMISSIONS; j++){
example.doWork(10, TimeUnit.SECONDS);
}
}
catch(Exception ex){
ex.printStackTrace();
}
finally{
// ClosableUtils.closeQuietly(client);
client.close();
}
return null;
}
};
service.submit(task);
}
service.shutdown();
service.awaitTermination(10, TimeUnit.MINUTES);
}
catch(Exception ex){
}
}
} 4、pom.xml
org.apache.curator curator-recipes 4.0.0 org.apache.curator curator-framework 4.0.0 org.apache.zookeeper zookeeper 3.4.10
5、关键点
① 客户端端口即将断开连接
② 断开连接后临时节点消失
6、测试结果
client2 has acquired the lock! 分布式锁-线程：pool-1-thread-3卖了1张票，火车票还剩：50张 client2 has released the lock! client3 has acquired the lock! 分布式锁-线程：pool-1-thread-4卖了1张票，火车票还剩：49张 client3 has released the lock! client1 has acquired the lock! 分布式锁-线程：pool-1-thread-2卖了1张票，火车票还剩：48张 client1 has released the lock! client4 has acquired the lock! 分布式锁-线程：pool-1-thread-5卖了1张票，火车票还剩：47张 client4 has released the lock! client0 has acquired the lock! 分布式锁-线程：pool-1-thread-1卖了1张票，火车票还剩：46张 client0 has released the lock! client2 has acquired the lock! 分布式锁-线程：pool-1-thread-3卖了1张票，火车票还剩：45张 client2 has released the lock! client3 has acquired the lock! 分布式锁-线程：pool-1-thread-4卖了1张票，火车票还剩：44张 client3 has released the lock! client1 has acquired the lock! 分布式锁-线程：pool-1-thread-2卖了1张票，火车票还剩：43张 client1 has released the lock! client4 has acquired the lock! 分布式锁-线程：pool-1-thread-5卖了1张票，火车票还剩：42张 client4 has released the lock! client0 has acquired the lock! 分布式锁-线程：pool-1-thread-1卖了1张票，火车票还剩：41张 client0 has released the lock! client2 has acquired the lock! 分布式锁-线程：pool-1-thread-3卖了1张票，火车票还剩：40张 client2 has released the lock! client3 has acquired the lock! 分布式锁-线程：pool-1-thread-4卖了1张票，火车票还剩：39张 client3 has released the lock! client1 has acquired the lock! 分布式锁-线程：pool-1-thread-2卖了1张票，火车票还剩：38张 client1 has released the lock! client4 has acquired the lock! 分布式锁-线程：pool-1-thread-5卖了1张票，火车票还剩：37张 client4 has released the lock! client0 has acquired the lock! 分布式锁-线程：pool-1-thread-1卖了1张票，火车票还剩：36张 client0 has released the lock! client2 has acquired the lock! 分布式锁-线程：pool-1-thread-3卖了1张票，火车票还剩：35张 client2 has released the lock! client3 has acquired the lock! 分布式锁-线程：pool-1-thread-4卖了1张票，火车票还剩：34张 client3 has released the lock! client1 has acquired the lock! 分布式锁-线程：pool-1-thread-2卖了1张票，火车票还剩：33张 client1 has released the lock! client4 has acquired the lock! 分布式锁-线程：pool-1-thread-5卖了1张票，火车票还剩：32张 client4 has released the lock! client0 has acquired the lock! 分布式锁-线程：pool-1-thread-1卖了1张票，火车票还剩：31张 client0 has released the lock! client2 has acquired the lock! 分布式锁-线程：pool-1-thread-3卖了1张票，火车票还剩：30张 client2 has released the lock! client3 has acquired the lock! 分布式锁-线程：pool-1-thread-4卖了1张票，火车票还剩：29张 client3 has released the lock! client1 has acquired the lock! 分布式锁-线程：pool-1-thread-2卖了1张票，火车票还剩：28张 client1 has released the lock! client4 has acquired the lock! 分布式锁-线程：pool-1-thread-5卖了1张票，火车票还剩：27张 client4 has released the lock! client0 has acquired the lock! 分布式锁-线程：pool-1-thread-1卖了1张票，火车票还剩：26张 client0 has released the lock! client2 has acquired the lock! 分布式锁-线程：pool-1-thread-3卖了1张票，火车票还剩：25张 client2 has released the lock! client3 has acquired the lock! 分布式锁-线程：pool-1-thread-4卖了1张票，火车票还剩：24张 client3 has released the lock! client1 has acquired the lock! 分布式锁-线程：pool-1-thread-2卖了1张票，火车票还剩：23张 client1 has released the lock! client4 has acquired the lock! 分布式锁-线程：pool-1-thread-5卖了1张票，火车票还剩：22张 client4 has released the lock! client0 has acquired the lock! 分布式锁-线程：pool-1-thread-1卖了1张票，火车票还剩：21张 client0 has released the lock! client2 has acquired the lock! 分布式锁-线程：pool-1-thread-3卖了1张票，火车票还剩：20张 client2 has released the lock! client3 has acquired the lock! 分布式锁-线程：pool-1-thread-4卖了1张票，火车票还剩：19张 client3 has released the lock! client1 has acquired the lock! 分布式锁-线程：pool-1-thread-2卖了1张票，火车票还剩：18张 client1 has released the lock! client4 has acquired the lock! 分布式锁-线程：pool-1-thread-5卖了1张票，火车票还剩：17张 client4 has released the lock! client0 has acquired the lock! 分布式锁-线程：pool-1-thread-1卖了1张票，火车票还剩：16张 client0 has released the lock! client2 has acquired the lock! 分布式锁-线程：pool-1-thread-3卖了1张票，火车票还剩：15张 client2 has released the lock! client3 has acquired the lock! 分布式锁-线程：pool-1-thread-4卖了1张票，火车票还剩：14张 client3 has released the lock! client1 has acquired the lock! 分布式锁-线程：pool-1-thread-2卖了1张票，火车票还剩：13张 client1 has released the lock! client4 has acquired the lock! 分布式锁-线程：pool-1-thread-5卖了1张票，火车票还剩：12张 client4 has released the lock! client0 has acquired the lock! 分布式锁-线程：pool-1-thread-1卖了1张票，火车票还剩：11张 client0 has released the lock! client2 has acquired the lock! 分布式锁-线程：pool-1-thread-3卖了1张票，火车票还剩：10张 client2 has released the lock! client3 has acquired the lock! 分布式锁-线程：pool-1-thread-4卖了1张票，火车票还剩：9张 client3 has released the lock! client1 has acquired the lock! 分布式锁-线程：pool-1-thread-2卖了1张票，火车票还剩：8张 client1 has released the lock! client4 has acquired the lock! 分布式锁-线程：pool-1-thread-5卖了1张票，火车票还剩：7张 client4 has released the lock! client0 has acquired the lock! 分布式锁-线程：pool-1-thread-1卖了1张票，火车票还剩：6张 client0 has released the lock! client2 has acquired the lock! 分布式锁-线程：pool-1-thread-3卖了1张票，火车票还剩：5张 client2 has released the lock! client3 has acquired the lock! 分布式锁-线程：pool-1-thread-4卖了1张票，火车票还剩：4张 client3 has released the lock! client1 has acquired the lock! 分布式锁-线程：pool-1-thread-2卖了1张票，火车票还剩：3张 client1 has released the lock! client4 has acquired the lock! 分布式锁-线程：pool-1-thread-5卖了1张票，火车票还剩：2张 client4 has released the lock! client0 has acquired the lock! 分布式锁-线程：pool-1-thread-1卖了1张票，火车票还剩：1张 client0 has released the lock! client2 has acquired the lock! 分布式锁-线程：pool-1-thread-3卖了1张票，火车票还剩：0张 client2 has released the lock!
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