public static EventPublisher getPublisher(Class<? extends Event> topic) {
        if (ClassUtils.isAssignableFrom(SlowEvent.class, topic)) {
            return INSTANCE.sharePublisher;
        }
        return INSTANCE.publisherMap.get(topic.getCanonicalName());
    }
@Test
    void testGetPublisher() {
        assertEquals(NotifyCenter.getSharePublisher(), NotifyCenter.getPublisher(TestSlowEvent.class));
        assertTrue(NotifyCenter.getPublisher(TestEvent.class) instanceof DefaultPublisher);
    }