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n Where data must be viewed and manipulated in multiple ways n To facilitate maintenance n To support simultaneous, modular development by multiple developers n To allow division of labor by skill set n To facilitate unit testing n When employing enterprise beans that are reusable across applications
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n Clarifies application design through separation of data modeling issues from
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n Enhances reusability by separating application functionality from presentation n Facilitates distribution of the application, as MVC boundaries are natural
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n Can be used to divide deployment as well as make incremental updates possible n Forces clear designation of responsibilities and functional consistency, thereby
facilitating testability
n Increases flexibility, because data model, user interaction, and data display
can be made pluggable MVC designs may encounter the following problems:
n Components aren t able to take advantage of knowledge of other components
implementation details. This may have a negative effect on application performance. Skillful API design that optimizes the length of the code path (number of machine cycles) for each API function can assist in avoiding this problem to some extent.
n Communication volume and other latency issues must be carefully addressed;
otherwise, MVC may not scale well in distributed systems. Latency comes from several sources. Web application servers may take some time to process a request, especially if they are overloaded and model components are not local. Web clients can add delay if they do not efficiently handle the retrieved data and display it for the user. Latency caused by client or sluggish servers, however, can in principle be solved simply by providing a faster server or clustering.
n Maintenance of an MVC application may be difficult if the Model API is unstable,
because the Controller is written in terms of the Model API. There should be a decoupling between the sender and the receiver. A sender is an object that invokes an operation, and a receiver is an object that receives the request to execute a certain operation. The term request here refers to the command that is to be executed. This also allows us to vary when and how a request is fulfilled. This decoupling provides us with flexibility as well as extensibility. The command pattern turns the request into an object that can be stored and passed around in the same way as other objects. This provides a hook for Controller extensions to handle new Model functions. In addition, an adapter can often provide backward API compatibility.
4: Applicability of JEE Technology
MVC and the Struts Framework
The Struts framework has been developed by the Jakarta Project, which is sponsored by the Apache Software Foundation, to provide an open-source framework for building web applications with Java Servlet and JavaServer Pages (JSP) technology. The Struts framework is not the most popular framework for new development but it is probably the most prevalent. Struts supports application architectures based on the MVC design paradigm. The official Struts home page can be found at http:// jakarta.apache.org/struts. The primary areas of functionality included in Struts are:
n A controller servlet
Dispatches requests to appropriate Action classes provided by the application developer Facilitate creation of interactive, form-based applications
n JSP custom tag libraries n Utility classes
Provide support for XML parsing, automatic population of JavaBeans properties, and internationalizing prompts and messages
Struts applications adhere to the MVC design pattern. The three major components are the servlet Controller, JavaServer Pages (the View), and the application s business logic (the Model), as shown in Figure 4-12. The following text describes the process illustrated in Figure 4-12. First, the user request goes to a Controller that initializes the context/session for the overall transaction and alerts Page A s Model. The Controller then forwards execution to Page A s View (JSP). Page A posts back to the Controller, which calls Model A to validate the posted form data. If the input is invalid, Model A returns a result that the Controller uses to forward/redisplay Page A. The entire HttpServletRequest might be made available to the Model A bean, or the Controller might be clever enough to call setters for each posted form field via introspection. The Controller determines who is next in the chain through use of a multitude of options: straight if-else (or switch-case) code, an XML document, database records, or a rules engine. The Controller is the centralized traffic cop that knows when all required steps in a transaction are complete. The Model preserves the state (posted form fields) and holds validation logic. If the user action is invalid, the Controller is alerted to redisplay the same View/JSP. The Controller bundles and directs HTTP requests to other objects in the framework, including JSP. After it has been initialized, the Controller parses
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