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Similar to the GoF Design Patterns, the J2EE Patterns are broken down into the various sections that address the tiers (or layers) that make up an application:

d

The presentation tier encapsulates the logic required to service the clients accessing a system. Presentation tier patterns intercept a client request and then provide facilities such as single sign-on, management of the client session, and access to services in the business tier before constructing and delivering the response back to the client. The J2EE patterns available for the presentation layer follow:

Figure 6 78. Seamlessly switching in the iPad s full view. Not a single line of code!

n Composite View n Dispatcher View n Front Controller n Intercepting Filter n Service To Worker n View Helper

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The next table lists scenarios along with suggestions of one or more of the presentation tier J2EE patterns to aid in the solution.

A similar expression arises from the variation of the other term. All together, the boundary terms obtained by varying the action are

OK, we've completed two of the three switch view examples: 1. From Scratch: einSwitch_001 Video: http://www.rorylewis.com/docs/02_iPad_iPhone/06_iphone_ Movies/006_einSwitch_001.htm Correct code: http://www.rorylewis.com/xCode/006a_einSwitch01.zip 2. Tab-Bar: einSwitch_002 Video: http://www.rorylewis.com/docs/02_iPad_iPhone/06_iphone_ Movies/007_einSwitch_002.htm Correct code: http://www.rorylewis.com/xCode/006b_einSwitch02.zip 3. Custom Tab-Bar: einSwitch_003

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The business tier provides the services required by application clients and contains the business data and logic. All business processing for the application is gathered and placed into this tier. Enterprise JavaBean (EJB) components are one of the ways to implement business processing in this tier. Here are the J2EE patterns available for the business tier:

SF = d ( + + )

n Business Delegate n Composite Entity (formally Aggregate Entity) n Service Locator n Session Facade n Transfer Object (formally Value Object)

=

Video: http://www.rorylewis.com/docs/02_iPad_iPhone/06_iphone_ Movies/008_einSwitch_003.htm Correct code: http://www.rorylewis.com/xCode/006c_einSwitch03.zip You've seen how easy the no-brainer method was, and you really appreciate it because the first approach was a royal pain. In this third iteration, I will show you how to tweak things a little bit. Your creative brain will connect the dots and find it relatively easy to make minor adjustments because now you understand the logic under the hood.

You have an application that needs to preprocess and/or post-process a client request You have an application that requires centralized control for client request handling You need to add logging, debugging, or some other behavior to be carried out for each client request You want to create a generic command interface for delegating processing from the controller to the helper components You want to delegate processing to a JSP or servlet and you want to implement your Model View Controller (MVC) Controller as a JSP or servlet You want to create an MVC View from multiple subviews You need to implement an MVC View as a JSP or servlet You would like to partition your MVC Model and MVC View Your application needs to encapsulate presentation-related data formatting logic You want to implement your Helper components as Custom tags or JavaBeans Your application needs to combine multiple presentation patterns You want to encapsulate MVC View management and navigation logic

Intercepting Filter Front Controller and Intercepting Filter Front Controller and Intercepting Filter Front Controller

( + + )

Composite View View Helper View Helper View Helper View Helper Service To Worker and Dispatcher View Service To Worker and Dispatcher View

=0

The preliminary actions to take for einSwitch_003 are identical to einSwitch_002. The only items on your desktop will be the einstein01.png and the einstein02.png image files from the 006__6hEinSwitch01.zip you downloaded for einSwitch_001. Your desktop should be organized like mine, as shown in Figure 6 79.

The following table is a list of scenarios along with suggestions of one or more of the business tier J2EE patterns to aid in the solution.

(7.24)

This tier is responsible for accessing external resources and systems, such as relational and nonrelational data stores and any legacy applications. A business tier object uses

Open Xcode and enter N as shown in Figure 6 80; this will open the New Project window, in which you will click the Window-Based Application template. Name this project einSwitch003, as shown in Figure 6 81.

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