public boolean validta(String userName, String password) {
		Random random = new Random();

		try {
			long duration = (long) (Math.random() * 10);
			System.out.printf("Validator %s validate user during %d seconds\n",
					name, duration);
			TimeUnit.SECONDS.sleep(duration);
		} catch (InterruptedException e) {
			return false;
		}

		return random.nextBoolean();
	}