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Illustrate the Use of JEE for Work ow
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state information persistently. Additionally, they may be facades that know how to retrieve information from external sources such as databases when that information is requested. Entity EJBs (Enterprise JavaBeans) can also be used to represent internal state. Larger applications often represent possible business logic actions for a system as methods. Other systems may represent possible actions separately, often as Session EJBs. Smaller-scale applications may embed the available actions within the Action classes that are part of the Controller role. This is effective only when the logic is simple and reuse is not an issue. It is a good idea always to separate the business logic from the roles of the Action classes.
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Struts-based applications generally utilize JSPs to construct the View component. The JSP environment includes a set of standard action tags such as <jsp:useBean> as well as the ability to define custom tags and organized custom tag libraries. In addition, it is sometimes necessary for business objects to render themselves in HTML or XML, depending on their state at request time. It is easy to include the output from these objects in a resulting JSP page by using the <jsp:include> standard action tag.
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The Controller
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The Controller portion of the application focuses on receiving requests from the client (most often a user running a web browser), deciding what business logic function is to be performed, and delegating responsibility for producing the next phase of the user interface to an appropriate View component. Struts utilizes a servlet of class ActionServlet as the main component of the Controller. This servlet is configured through definition of a set of mappings that are described by a Java class ActionMapping. Each mapping defines a path, matched against the request URI of the incoming request as well as the fully qualified class name of an Action class. The Action class is responsible for performing the desired business logic and subsequently dispatching control to the appropriate View component to create the response. In addition, Struts supports the ability to use ActionMapping classes with additional properties beyond the standard ones needed to operate the framework. This enables storage of additional application-specific information while utilizing the remaining features of the framework. Furthermore, Struts allows definition of logical names for the forwarding of the control. The method can ask for the logical name of the page without knowing the actual name of the corresponding JSP page.
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4: Applicability of JEE Technology
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As Struts popularity has peaked, a number of new MVC Frameworks have emerged. For example:
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n JavaServer Faces (JSF)
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One of the most popular MVC Frameworks. It uses a component-based architecture making it the best supported framework for pluggable third-party visual controls. See http://java.sun.com/javaee/ javaserverfaces for more information. An open-source MVC Framework that it is being integrated into Struts as Struts II. See www.opensymphony.com/webwork/ for more information. An open-source MVC Framework that emphasizes simplicity of development and scalability of applications. See http://tapestry.apache.org for more information.
n WebWork
n Tapestry
EXERCISE 4-3 Structuring Development
Question When building a JEE application within an enterprise where valuable legacy systems exist and Java with JEE is growing in use but not the strong suite in the skill set of the current majority of the enterprise developers, how can you structure the development to maximize productivity Answer Productivity with a new technology can generally be achieved by striving for the following goals:
n Code and design reuse
Maximize code reuse so as to decrease the cost for development, provide incremental quality improvements, and establish design best practices that everyone in the organization understands. Every class in the design should play a clearly defined role in the application. The resulting design clarity will facilitate maintenance, impact analysis and system extension, and flatten the learning curve for new developers. The design should partition the application into chunks that reflect the skill sets of subteams in the
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