public long getNum(long timeMs) {
        return getSlot(timeMs).num;
    }
@Test
    public void testGetNum() {
        long delayedTime = defaultDelay + precisionMs;

        timerWheel.putSlot(delayedTime, 1, 2, 3, 4);
        assertEquals(3, timerWheel.getNum(delayedTime));
        assertEquals(3, timerWheel.getAllNum(delayedTime));

        timerWheel.putSlot(delayedTime + 5 * precisionMs, 5, 6, 7, 8);
        assertEquals(7, timerWheel.getNum(delayedTime + 5 * precisionMs));
        assertEquals(10, timerWheel.getAllNum(delayedTime));
    }