Sử dụng sơ đồ này để hiển thị các dòng chảy của một hệ thống, ngay cả đối với điều đang xảy ra bên ngoài của hệ thống bạn xây dựng. Sơ đồ có thể cung cấp một hữu ích ", bạn đang ở đây" bản đồ cho tất cả mọi người liên lạc về | 410 Chapter 11 All calls to DAOs are made only through the appropriate business object. For example to access the BorrowerDao you call the Borrower business object. JSP only access the model in the MVC architectural pattern via a Value Object. JSPs do not access any business-related objects directly. JSP contain only presentation-related code. No business functionality is contained in the JSP. JSPs do not contain any Java scriptlet code. Instead they use taglibs to conditionally show or hide certain presentation-related data. Action classes supported by Struts framework contain only code related to extracting the data from the request objects passing data to the appropriate business object and returning to the appropriate JSP. There is no business code in these action classes. This enables you to support more than one type of client other than a Web browser . Since FormBeans are an implementation mechanism of the Struts framework we chose to link the FormBeans to the Value Object and then act upon the Value Object elsewhere in the application. This way if you need to use a different framework you can do so with minimal impact. Performing Detailed Design The purpose of the detailed design is to employ the strategic architectural design and all of its associated implicit guidance like key patterns for frequently performed or critical functionality and adhere to it while evolving the results of analysis or even earlier iterations into a precise and semantically rich representation of what you want to build in code. This gets pretty detailed including such things as refining individual class specs to ensure that they are complete meeting the policies of the project for exception propagation reporting general handling and so on. After a few iterations the design model should be detailed enough so that you can hand the model to a tool and an appropriate compliable specification so that its classes can be generated with a click of a button. Clearly the visual parts of UML
