public static void main(String[] args){
		String key = "key";
		try (ELocker locker = locker(key, 100)){
			for (int i = 0; i < 10; i++) {
				System.out.println(Thread.currentThread().getId() + ">>" + i);
				Thread.sleep(100l);
			}
		} catch (InterruptedException e) {
			e.printStackTrace();
		} 
	}