public static String brokerVIPChannel(final boolean isChange, final String brokerAddr) {
        if (isChange) {
            int split = brokerAddr.lastIndexOf(":");
            String ip = brokerAddr.substring(0, split);
            String port = brokerAddr.substring(split + 1);
            String brokerAddrNew = ip + ":" + (Integer.parseInt(port) - 2);
            return brokerAddrNew;
        } else {
            return brokerAddr;
        }
    }
@Test
    public void testBrokerVIPChannel() {
        assertThat(MixAll.brokerVIPChannel(true, "127.0.0.1:10911")).isEqualTo("127.0.0.1:10909");
    }