public class Monitor {

	private boolean locked;

	public Monitor() {
		this.locked = true;
	}

	public boolean isLocked() {
		return this.locked;
	}

	public void unlockAndNotify() {
		this.locked = false;
		this.notify();
	}
	
	public void timedWait(int timeout) throws InterruptedException {
		long abortTime = System.currentTimeMillis() + timeout;
		while (isLocked() && System.currentTimeMillis() < abortTime)
			wait(abortTime - System.currentTimeMillis());
	}
	
	public void untimedWait() throws InterruptedException {
		while (isLocked())
			wait();
	}
}