The messaging layer of a cluster system provides messaging and membership capabilities that are necessary for understanding the presence (or lack) of a service.

群集系统的消息收发层提供了解服务存在(或缺少)所必需的消息收发与成员功能。

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The role of a service implementation is to enforce the system of record's integrity, almost as a pure data access layer.

服务的实现目标是强化整个系统的集成能力；每个服务，本质上都可以看作是一个纯粹的数据接口层。

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This layer is called Software-as-a-Service (SaaS), and it is the model of deploying software from a centralized system to run on a local computer (or remotely from the cloud).

这一层被称作Soft ware - as - a - Service (SaaS)，它是从一个集中的系统部署软件，使之在一台本地计算机上(或从云中远程地)运行的一个模型。

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