code: protected void doRegister(String appName, String serviceName, String serviceData, String group) {
          PublisherRegistration publisherRegistration;
          // 生成注册对象，并添加额外属性
          publisherRegistration = new PublisherRegistration(serviceName);
  
          publisherRegistration.setGroup(group);
          addAttributes(publisherRegistration, group);
  
          // 去注册
          SofaRegistryClient.getRegistryClient(appName, registryConfig).register(publisherRegistration, serviceData);
      }
docs: 注册单条服务信息
  
  @param appName     应用
  @param serviceName 服务关键字
  @param serviceData 服务提供者数据
  @param group       服务分组