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zookeeper中怎么實現(xiàn)分布式鎖，很多新手對此不是很清楚，為了幫助大家解決這個難題，下面小編將為大家詳細講解，有這方面需求的人可以來學習下，希望你能有所收獲。
利用zk的臨時有序節(jié)點機制實現(xiàn)分布式鎖
zk節(jié)點的四種類型：持久節(jié)點、持久順序節(jié)點、臨時節(jié)點、臨時順序節(jié)點。
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("分布式鎖-線程：" + Thread.currentThread().getName() + "賣了1張票，火車票還剩：" + (--ticket) + "張");
}
}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 {
//鎖對象
private final InterProcessMutex lock;
//火車票共享資源
private final FakeLimitedResource resource;
//客戶端名稱
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{
//嘗試獲取鎖，過時不候（超時機制）
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();
}
}
}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){
//模擬火車票一次只能由一個進程訪問
final FakeLimitedResource resource = new FakeLimitedResource();
//定義默認初始化有5個線程的線程池
ExecutorService service = Executors.newFixedThreadPool(QTY);
try{
for(int i = 0; i < QTY; i++){
final int index = i;
Callable<Void> task = new Callable<Void>(){
public Void call() throws Exception{
//獲取zk集群連接
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);
//模擬一個線程賣50張票
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){
}
}
}<dependencies> <dependency> <groupId>org.apache.curator</groupId> <artifactId>curator-recipes</artifactId> <version>4.0.0</version> </dependency> <dependency> <groupId>org.apache.curator</groupId> <artifactId>curator-framework</artifactId> <version>4.0.0</version> </dependency> <dependency> <groupId>org.apache.zookeeper</groupId> <artifactId>zookeeper</artifactId> <version>3.4.10</version> </dependency> </dependencies>
client2 has acquired the lock! 分布式鎖-線程：pool-1-thread-3賣了1張票，火車票還剩：50張 client2 has released the lock! client3 has acquired the lock! 分布式鎖-線程：pool-1-thread-4賣了1張票，火車票還剩：49張 client3 has released the lock! client1 has acquired the lock! 分布式鎖-線程：pool-1-thread-2賣了1張票，火車票還剩：48張 client1 has released the lock! client4 has acquired the lock! 分布式鎖-線程：pool-1-thread-5賣了1張票，火車票還剩：47張 client4 has released the lock! client0 has acquired the lock! 分布式鎖-線程：pool-1-thread-1賣了1張票，火車票還剩：46張 client0 has released the lock! client2 has acquired the lock! 分布式鎖-線程：pool-1-thread-3賣了1張票，火車票還剩：45張 client2 has released the lock! client3 has acquired the lock! 分布式鎖-線程：pool-1-thread-4賣了1張票，火車票還剩：44張 client3 has released the lock! client1 has acquired the lock! 分布式鎖-線程：pool-1-thread-2賣了1張票，火車票還剩：43張 client1 has released the lock! client4 has acquired the lock! 分布式鎖-線程：pool-1-thread-5賣了1張票，火車票還剩：42張 client4 has released the lock! client0 has acquired the lock! 分布式鎖-線程：pool-1-thread-1賣了1張票，火車票還剩：41張 client0 has released the lock! client2 has acquired the lock! 分布式鎖-線程：pool-1-thread-3賣了1張票，火車票還剩：40張 client2 has released the lock! client3 has acquired the lock! 分布式鎖-線程：pool-1-thread-4賣了1張票，火車票還剩：39張 client3 has released the lock! client1 has acquired the lock! 分布式鎖-線程：pool-1-thread-2賣了1張票，火車票還剩：38張 client1 has released the lock! client4 has acquired the lock! 分布式鎖-線程：pool-1-thread-5賣了1張票，火車票還剩：37張 client4 has released the lock! client0 has acquired the lock! 分布式鎖-線程：pool-1-thread-1賣了1張票，火車票還剩：36張 client0 has released the lock! client2 has acquired the lock! 分布式鎖-線程：pool-1-thread-3賣了1張票，火車票還剩：35張 client2 has released the lock! client3 has acquired the lock! 分布式鎖-線程：pool-1-thread-4賣了1張票，火車票還剩：34張 client3 has released the lock! client1 has acquired the lock! 分布式鎖-線程：pool-1-thread-2賣了1張票，火車票還剩：33張 client1 has released the lock! client4 has acquired the lock! 分布式鎖-線程：pool-1-thread-5賣了1張票，火車票還剩：32張 client4 has released the lock! client0 has acquired the lock! 分布式鎖-線程：pool-1-thread-1賣了1張票，火車票還剩：31張 client0 has released the lock! client2 has acquired the lock! 分布式鎖-線程：pool-1-thread-3賣了1張票，火車票還剩：30張 client2 has released the lock! client3 has acquired the lock! 分布式鎖-線程：pool-1-thread-4賣了1張票，火車票還剩：29張 client3 has released the lock! client1 has acquired the lock! 分布式鎖-線程：pool-1-thread-2賣了1張票，火車票還剩：28張 client1 has released the lock! client4 has acquired the lock! 分布式鎖-線程：pool-1-thread-5賣了1張票，火車票還剩：27張 client4 has released the lock! client0 has acquired the lock! 分布式鎖-線程：pool-1-thread-1賣了1張票，火車票還剩：26張 client0 has released the lock! client2 has acquired the lock! 分布式鎖-線程：pool-1-thread-3賣了1張票，火車票還剩：25張 client2 has released the lock! client3 has acquired the lock! 分布式鎖-線程：pool-1-thread-4賣了1張票，火車票還剩：24張 client3 has released the lock! client1 has acquired the lock! 分布式鎖-線程：pool-1-thread-2賣了1張票，火車票還剩：23張 client1 has released the lock! client4 has acquired the lock! 分布式鎖-線程：pool-1-thread-5賣了1張票，火車票還剩：22張 client4 has released the lock! client0 has acquired the lock! 分布式鎖-線程：pool-1-thread-1賣了1張票，火車票還剩：21張 client0 has released the lock! client2 has acquired the lock! 分布式鎖-線程：pool-1-thread-3賣了1張票，火車票還剩：20張 client2 has released the lock! client3 has acquired the lock! 分布式鎖-線程：pool-1-thread-4賣了1張票，火車票還剩：19張 client3 has released the lock! client1 has acquired the lock! 分布式鎖-線程：pool-1-thread-2賣了1張票，火車票還剩：18張 client1 has released the lock! client4 has acquired the lock! 分布式鎖-線程：pool-1-thread-5賣了1張票，火車票還剩：17張 client4 has released the lock! client0 has acquired the lock! 分布式鎖-線程：pool-1-thread-1賣了1張票，火車票還剩：16張 client0 has released the lock! client2 has acquired the lock! 分布式鎖-線程：pool-1-thread-3賣了1張票，火車票還剩：15張 client2 has released the lock! client3 has acquired the lock! 分布式鎖-線程：pool-1-thread-4賣了1張票，火車票還剩：14張 client3 has released the lock! client1 has acquired the lock! 分布式鎖-線程：pool-1-thread-2賣了1張票，火車票還剩：13張 client1 has released the lock! client4 has acquired the lock! 分布式鎖-線程：pool-1-thread-5賣了1張票，火車票還剩：12張 client4 has released the lock! client0 has acquired the lock! 分布式鎖-線程：pool-1-thread-1賣了1張票，火車票還剩：11張 client0 has released the lock! client2 has acquired the lock! 分布式鎖-線程：pool-1-thread-3賣了1張票，火車票還剩：10張 client2 has released the lock! client3 has acquired the lock! 分布式鎖-線程：pool-1-thread-4賣了1張票，火車票還剩：9張 client3 has released the lock! client1 has acquired the lock! 分布式鎖-線程：pool-1-thread-2賣了1張票，火車票還剩：8張 client1 has released the lock! client4 has acquired the lock! 分布式鎖-線程：pool-1-thread-5賣了1張票，火車票還剩：7張 client4 has released the lock! client0 has acquired the lock! 分布式鎖-線程：pool-1-thread-1賣了1張票，火車票還剩：6張 client0 has released the lock! client2 has acquired the lock! 分布式鎖-線程：pool-1-thread-3賣了1張票，火車票還剩：5張 client2 has released the lock! client3 has acquired the lock! 分布式鎖-線程：pool-1-thread-4賣了1張票，火車票還剩：4張 client3 has released the lock! client1 has acquired the lock! 分布式鎖-線程：pool-1-thread-2賣了1張票，火車票還剩：3張 client1 has released the lock! client4 has acquired the lock! 分布式鎖-線程：pool-1-thread-5賣了1張票，火車票還剩：2張 client4 has released the lock! client0 has acquired the lock! 分布式鎖-線程：pool-1-thread-1賣了1張票，火車票還剩：1張 client0 has released the lock! client2 has acquired the lock! 分布式鎖-線程：pool-1-thread-3賣了1張票，火車票還剩：0張 client2 has released the lock!
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