apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/controller/ItemController.java/ItemController/ItemController
class ItemController:  public ItemController(final ItemService configService, final UserInfoHolder userInfoHolder,
                        final PermissionValidator permissionValidator, final NamespaceService namespaceService) {
    this.configService = configService;
    this.userInfoHolder = userInfoHolder;
    this.permissionValidator = permissionValidator;
    this.namespaceService = namespaceService;
  }