code: public Map<String, Object> serialize() {
          Map<String, Object> serverInfo = new HashMap<String, Object>();
          serverInfo.put("totalCount", totalCount);
          serverInfo.put("cursor", cursor);
          serverInfo.put("serviceName", serviceName);
          serverInfo.put("columnNames", columns);
          serverInfo.put("version", version);
          serverInfo.put("id", id);
          serverInfo.put("initialData", data);
  
          return serverInfo;
      }
docs: Return Map that can be serialized as result.
  
  @return serializable informations