One concrete function that the EventService service layer accomplishes is that it acts as the plug-in point for transaction management, as we’ll show later.

EventService 服务层实现的一个具体功能在于，它充当事务管理的插件点，稍后我们将会说明这一点。

youdao

Here fetching strategy decision management is kept out side the lower level service or repository layer.

这里我们将对抓取策略的管理放在了底层服务和Respository层之外。

youdao

A service registry provides registration of services, management of metadata and automation services. This layer is evaluated based on answers from the following questionnaire.

服务注册表提供服务的注册、元数据的管理和自动化服务。

youdao

Beginning with the well-known Infrastructure-as-a-Service (IaaS), Platform-as-a-Service (PaaS) and Software-as-a-Service (SaaS) structure, Gartner added in a Business and Information Systems layer that includes brokerages, management and security.

FORBES: Demystifying Cloud Vendors