apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/component/PortalSettings.java/PortalSettings/PortalSettings
class PortalSettings:  public PortalSettings(
          final ApplicationContext applicationContext,
          final PortalConfig portalConfig,
          final PortalMetaDomainService portalMetaDomainService
  ) {
    this.applicationContext = applicationContext;
    this.portalConfig = portalConfig;
    this.portalMetaDomainService = portalMetaDomainService;
  }