package com.csdhsm.concurrent;

import java.util.concurrent.TimeUnit;

import java.util.concurrent.locks.ReentrantLock;

/**

* @Title: AttemptLocking.java

* @Package: com.csdhsm.concurrent

* @Description 虽然显性Lock方法比Synchronized要写得多一点，但是显性的Lock方法可以解决一些特殊的方法

* @author Han

* @date 2016-4-9 下午9:11:40

* @version V1.0

*/

public class AttemptLocking {

/**

* 重入锁

*/

private ReentrantLock lock = new ReentrantLock();

public void untimed(){

boolean captured = lock.tryLock();

try{

System.out.println("lock.tryLock()" + ":" + captured);

}finally{

if(captured){

lock.unlock();

}

}

}

public void timed(){

boolean captured = false;

try {

captured = lock.tryLock(2, TimeUnit.SECONDS);

} catch (InterruptedException e) {

e.printStackTrace();

}

try{

System.out.println("lock.tryLock(2, TimeUnit.SECONDS)" + captured);

}finally{

if(captured){

lock.unlock();

}

}

}

public static void main(String[] args) {

final AttemptLocking locking = new AttemptLocking();

locking.untimed();

locking.timed();

new Thread(){

public void run() {

locking.lock.lock();

System.out.println("acquired");

};

}.start();

try {

Thread.sleep(100);

} catch (InterruptedException e) {

e.printStackTrace();

}

Thread.yield();

locking.untimed();

locking.timed();

}

}