apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/service/ItemService.java/ItemService/ItemService
class ItemService:  public ItemService(
      final ItemRepository itemRepository,
      final @Lazy NamespaceService namespaceService,
      final AuditService auditService,
      final BizConfig bizConfig) {
    this.itemRepository = itemRepository;
    this.namespaceService = namespaceService;
    this.auditService = auditService;
    this.bizConfig = bizConfig;
  }