Excel Services – Architecture
Excel服务——体系架构

Before I continue to drill down on the features of Excel Services, I would like to explain the architecture at a high level and touch on configuration possibilities.
在我继续勾勒Excel服务的特性以前，我想从一个较高的层次解说Excel服务的体系架构。

Excel Services is built on the SharePoint products and technologies platform. There are three core components of Excel Services
Excel服务是建立在SharePoint产品和技术平台之上，有三个核心组件。

Excel Calculation Service
Excel Web Access
Excel Web Service
Excel计算服务
Excel网络存取
Excel网络服务

Box Diagram
图框
Here is what each of these components do.
这里解释每一个组件的作用.

Excel Web Access – This is a web-part in SharePoint that performs the “rendering” (development team speak for “creating the HTML”) of Excel Workbooks on a web page. This is perhaps the most visible component for the end user. For those of you familiar with SharePoint, you can use it like any other web part in SharePoint to create a wide range of web pages.
Excel网络存取——SharePoint平台网络功能的一部分，负责”编译”(开发团队说这是”生成HTML “)Excel工作簿成为一个网页. 对于最终用户来说这也许是最显而易见的部分. 对于熟悉SharePoint的你,你可以用它像SharePoint其他网络功能一样来建立包括很多行的网页.

Excel Web Services – This component provides the programmatic access that I talked about yesterday. It is a web service hosted in SharePoint. You can use methods in this web service to develop applications that incorporate calculations done by Excel Services and to automate the update of Excel spreadsheets.
Excel网络服务——这个组件提供目录的存取，如同我昨天说的. 这是在SharePoint上的网络服务. 你可以使用这个方法来开发服务网络应用服务,将Excel表格的计算自动更新.

Excel Calculation Service – This is the component that loads the spreadsheets, calculates them, refreshes external data, and maintains session state for interactivity. This is the heart of Excel Services.
Excel计算服务——这个组件装载并计算表格，刷新外部日期，保持最新 的版本。这是Excel服务的心脏。

Additionally, there is also a proxy that is used internally to handle the communication between the components on the web front end and the application server in multiple-server configurations. It also handles the load balancing in case there are multiple application servers in your installation.
此外还有一种新特性，是可以配置多台服务器以达到使应用服务和网络负载平衡。这可以通过你的安装来进行规划实现。

These three components are divided in two major groups – those that live on a front-end server (which we refer to as a “web front end”), and those that live on a back-end application server. In the simplest of the configurations, all these components could be running on the same machine (we call this a “single box” installation). In a typical production environment with significant number of users, the components on the web front end and the application server would be on different machines. It is possible to scale (up or out) these components independently.
这三个组件分为两大类,前台服务器(我们称为”网络前台”)组件,后端应用服务器组件. 在简单的配置中,这些组件可以运行在同机器(我们称之为”单盒”安装). 在有大量不同用户的典型环境中,前台后台组件可以运行在不同的机器上。也就是说在将来这些组件有可能都是独立的。.

Security
安全

Excel Services leverages the security infrastructure provided by SharePoint. Excel services uses SharePoint for authentication (who can log into the server) as well as authorization (who has access to which spreadsheet and the type of access; read, write, view only etc.). This provides a robust security environment for protecting your spreadsheets.
凭借SharePoint安全基础设施Excel服务同样安全. Excel使用SharePoint的认证服务, (登陆服务器)以及授权(获取表格的类型和使用; 读、写、浏览等等). 这个环境为你的表格提供了有力的安全保障.

Performance and Scalability
性能和扩充

Excel Services are optimized for scenarios in which multiple users access the same spreadsheets. We have done a lot of work to optimize for this scenario – for example, caching at multiple levels so that collective performance for a group of users is improved by caching spreadsheets as well as external data queried by the spreadsheets. All this is transparent to the end user except for the good response time. (Anticipating a question, we only share cached results between users that have the same rights.)
Excel服务优化了多用户使用同一表格工作. 为优化这种状况我们已经做了大量工作,例如在多层次上的高速缓冲存贮使用户组可以在不同的时间里集体编辑同张表格. 在最终用户希望有很快的反映时间这个问题上所有的一切都是可见的. (预计到了这个问题,对于有相同权限的用户之间我们仅仅共享缓存上的结果).

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