class MyLock implements Lock {
private MySync sync = new MySync();
private class MySync extends AbstractQueuedSynchronizer {
@Override
protected boolean tryAcquire(int arg) {
if (compareAndSetState(0, 1)) {
setExclusiveOwnerThread(Thread.currentThread());
return true;
}
return false;
}
@Override
protected boolean tryRelease(int arg) {
if (compareAndSetState(1, 0)) {
setExclusiveOwnerThread(null);
return true;
}
return false;
}
@Override
protected boolean isHeldExclusively() {
return getState() == 1;
}
public Condition newCondition() {
return new ConditionObject();
}
}
@Override
public void lock() {
sync.acquire(1);
}
@Override
public void lockInterruptibly() throws InterruptedException {
sync.acquireInterruptibly(1);
}
@Override
public boolean tryLock() {
return sync.tryAcquire(1);
}
@Override
public boolean tryLock(long time, TimeUnit unit) throws InterruptedException {
return sync.tryAcquireNanos(1, unit.toNanos(time));
}
@Override
public void unlock() {
sync.release(1);
}
@Override
public Condition newCondition() {
return sync.newCondition();
}
}