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Illustrate the Use of JEE for Work ow
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development group. For example, the design specifies using JSP tag libraries, instead of JSP pages with embedded code, and then web page designers with no knowledge of programming can operate in parallel with programmers, and programmers can focus on solving coding problems.
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Design such that parts of the application that change quickly will require both ease of change and looser coupling to the rest of the system. Subsystems that change more slowly can be more tightly coupled, providing efficiency opportunities. The application functionality must be able to keep up with organizational growth and technological change. We should break the design into modules that interact through well-defined interfaces, thereby allowing the developer to work independently, enhance maintainability and testability, and provide opportunities for using purchased components and outsourcing some development. Data security enforcement is crucial, especially if the application is performing financial transactions, for the privacy and security of customers. The application GUI should be designed such that the user can always intuitively know where to look for desired information. The application should avoid transmitting data needlessly or redundantly.
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The data should be represented in a way most appropriate for the task at hand. New types of user interfaces should be easy to add. The design should fulfill the goal by using the MVC design pattern to separate form, function, and data; by dividing the application into functional modules and multiple tiers; and by applying several design patterns, which are common problem solutions that have been found to work well in the past. The existing legacy systems can be accessed via the JEE components by using the Proxy, Adapter, or Facade patterns to wrap legacy systems with Java-based APIs such as JNI (Java Native Interface) so that legacy developers can continue their work and JEE developers can interface with the technology, obviating the need to rebuild the legacy functionality in JEE. The legacy systems are given a new life, as they are now JEE-enabled.
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4: Applicability of JEE Technology
EXERCISE 4-4 Defining Best Practice and Guideline
Question Define the concepts of best practice and guideline. Answer A best practice is a technique used to drive design at the component level. A best practice is an optimal process that is recognized by peers in similar situations. It is applicable to a cross-section of scenarios with varying resources and sizes. It takes design requirements into consideration. For example, a best practice might be to use session beans as facades to entity beans. On the other hand, a guideline is a rule applied horizontally to the design. Guidelines reflect agreements on practices or operations by recognized professional associations. This includes formal, approved standards, as contrasted to de facto standards and proprietary standards that are exceptions to this concept. For example, to minimize network traffic, the architect attempts to maximize the content of a data request that is, we try to get as much as we can out of each request.
CERTIFICATION OBJECTIVE 4.05
Review Best Practices Applicable for All Tiers
The MVC best practice is a design pattern that can be applied across all tiers. The MVC architecture is a way to divide functionality among objects involved in maintaining and presenting data so as to minimize the degree of coupling between the objects. The MVC architecture was originally developed to map the traditional input, processing, and output tasks to the graphical user interaction model. However, it is straightforward to map these concepts into the domain of multi-tier web-based enterprise applications. In the MVC architecture, the Model represents application data and the business rules that govern access and modification of this data. The Model can be represented in many ways, including but not limited to EJBs and JavaBeans. The Model notifies views when it changes and provides the ability for the View to query the Model
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