private Map<Integer, Map<String, ServerState>> serverStateMap = null; // channelId,ip,ServerState

    private static ServerStateRepo instance = new ServerStateRepo();

public void updateServerState(int channelId, String ip, ServerState serverState) {//这个方法有效果？
        synchronized (serverStateMap) {
            log.info("updateServerState");
            Map<String, ServerState> ipServerMap = serverStateMap.get(channelId); //ip,serverState
            if (null != ipServerMap) {
                ipServerMap.put(ip, serverState);
            }
        }
    }