java：aqs实现自定义可重入锁

package com.company.aqs;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.AbstractQueuedSynchronizer;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;

/**
 *类说明：实现我们自己独占锁,可重入
 */
public class ReenterSelfLock implements Lock {
    // 静态内部类，自定义同步器
    private static class Sync extends AbstractQueuedSynchronizer {

        // 是否处于占用状态
        protected boolean isHeldExclusively() {
            return getState() > 0;
        }

        // 当状态为0的时候获取锁
        public boolean tryAcquire(int acquires) {
            if (compareAndSetState(0, 1)) {
                setExclusiveOwnerThread(Thread.currentThread());
                return true;
            }else if(getExclusiveOwnerThread()==Thread.currentThread()){
                setState(getState()+1);
                return  true;
            }
            return false;
        }

        // 释放锁，将状态设置为0
        protected boolean tryRelease(int releases) {
            if(getExclusiveOwnerThread()!=Thread.currentThread()){
                throw new IllegalMonitorStateException();
            }
            if (getState() == 0)
                throw new IllegalMonitorStateException();

            setState(getState()-1);
            if(getState()==0){
                setExclusiveOwnerThread(null);
            }
            return true;
        }

        // 返回一个Condition，每个condition都包含了一个condition队列
        Condition newCondition() {
            return new ConditionObject();
        }
    }

    // 仅需要将操作代理到Sync上即可
    private final Sync sync = new Sync();

    public void lock() {
    	System.out.println(Thread.currentThread().getName()+" ready get lock");
        sync.acquire(1);
        System.out.println(Thread.currentThread().getName()+" already got lock");
    }

    public boolean tryLock() {
        return sync.tryAcquire(1);
    }

    public void unlock() {
    	System.out.println(Thread.currentThread().getName()+" ready release lock");
        sync.release(1);
        System.out.println(Thread.currentThread().getName()+" already released lock");
    }

    public Condition newCondition() {
        return sync.newCondition();
    }

    public boolean isLocked() {
        return sync.isHeldExclusively();
    }

    public boolean hasQueuedThreads() {
        return sync.hasQueuedThreads();
    }

    public void lockInterruptibly() throws InterruptedException {
        sync.acquireInterruptibly(1);
    }

    public boolean tryLock(long timeout, TimeUnit unit) throws InterruptedException {
        return sync.tryAcquireNanos(1, unit.toNanos(timeout));
    }
}