@Override
    public void shutdown() {
        writeBehindService.stop();
        connectionManager.shutdown();
    }
@Test
    public void testShutdown() {
        RedissonClient r = createInstance();
        Assertions.assertFalse(r.isShuttingDown());
        Assertions.assertFalse(r.isShutdown());
        r.shutdown();
        Assertions.assertTrue(r.isShuttingDown());
        Assertions.assertTrue(r.isShutdown());
    }