@Override
    public void invokeConnectionComingSync(String clientAddr, int clientPort, Channel channel) {
        //调用同步函数
        Enumeration<NettyListener> listenerList = listeners.keys();
        while (listenerList.hasMoreElements()) {
            NettyListener listener = listenerList.nextElement();
            if (listener instanceof NettyConnectionComingListener) {
                ((NettyConnectionComingListener) listener).connecting(clientAddr, clientPort,
                    channel);
            }
        }
    }