apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/controller/SearchController.java/SearchController/SearchController
class SearchController:  public SearchController(final AppService appService,
                          final PortalSettings portalSettings,
                          final PortalConfig portalConfig,
                          final NamespaceService namespaceService) {
    this.appService = appService;
    this.portalConfig = portalConfig;
    this.portalSettings = portalSettings;
    this.namespaceService = namespaceService;
  }