文件名称:
软件架构艺术( The Art of Software Architecture: Design Methods and Techniques)
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文件大小: 5mb
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上传时间: 2009-05-04
详细说明： Software architecture is often confused with low-level design and the technology stack. Technology vendors and popular technology-focused journals tend to propagate this misunderstanding. As a result, many software engineers produce architecture descriptions tha t are nothing more than regurgitated diagrams of technology layers. The classic enterprise application architecture is often a diagram of so-called architectural layers depicting a presentation layer on top of a business logic layer (or middle-tier) on top of a persistence layer. This representation communicates nothing about how the system handles the functional or nonfunctional requirements of the system. It merely shows the technology to be used and how that technology will be integrated. There is a temptation to assume that the layers of an application architecture map directly to individual technologies: Presentation is composed of Java Servlets and Java Server Pages (JSP); the business layer is composed of Enterprise JavaBeans (EJB); and the persistence layer is a relational database management system (RDBMS). For some simple systems, there is a one-to-one correspondence between the architectural layers and individual technologies. Those assumptions quickly become fallacies when the system becomes functionally more complex. Presentation logic may be composed not only of the servlets and JSP but also of EJBs and data stored in a relational database (for example, user preferences). Business logic may be composed not only of middle-tier EJB objects but also stored procedures and database triggers as well as other component technologies such as business rules engines and workflow engines. ...展开收缩
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