apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/controller/SystemInfoController.java/SystemInfoController/SystemInfoController
class SystemInfoController:  public SystemInfoController(
      final PortalSettings portalSettings,
      final RestTemplateFactory restTemplateFactory,
      final PortalMetaDomainService portalMetaDomainService
  ) {
    this.portalSettings = portalSettings;
    this.restTemplateFactory = restTemplateFactory;
    this.portalMetaDomainService = portalMetaDomainService;
  }