java多執行緒與併發 - 自己實現一個簡單的鎖(實現Lock介面)

package com.zx.lock;

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

public class MyLock implements Lock {
	
	//要維護1.當前是否有鎖(保證能鎖住)，2.拿到鎖的執行緒和3.已上鎖的數量(保證可重入)
	//判斷當前是否有鎖。
	private volatile boolean isLock=false;
	//拿到鎖的執行緒。
	private Thread lockedThread=null;
	//已上的鎖的數量。
	private int lockCount;
	
	@Override
	public synchronized void lock() {
		
		Thread currentThread = Thread.currentThread();
		while(isLock && currentThread!=lockedThread){
			try {
				wait();
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		isLock=true;
		lockedThread=currentThread;
		lockCount++;
	}

	@Override
	public synchronized void unlock() {
		
		if(Thread.currentThread()==lockedThread){
			lockCount--;
			if(lockCount==0){
				notifyAll();
				isLock=false;
			}
		}
	}

	@Override
	public void lockInterruptibly() throws InterruptedException {
		// TODO Auto-generated method stub
		
	}

	@Override
	public boolean tryLock() {
		// TODO Auto-generated method stub
		return false;
	}

	@Override
	public Condition newCondition() {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public boolean tryLock(long time, TimeUnit unit) throws InterruptedException {
		// TODO Auto-generated method stub
		return false;
	}
	


}