code: long getLastPatchTime() {
      if (lastPatchTime <= 0) {
        lastPatchTime = AppConfiguration.getDefaultSetting().getLong(selfId,
                LAST_PATCH_TIME, 0L);
      }
  
      if (lastPatchTime <= 0) {
        lastPatchTime = System.currentTimeMillis();
        AppConfiguration.getDefaultSetting().saveLong(selfId, LAST_PATCH_TIME, lastPatchTime);
      }
      return lastPatchTime;
    }
docs: 获取最后接收到 server patch 的时间
  按照业务需求，当本地没有缓存此数据时，返回最初始的客户端值
  @return