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Given Scenario
A set of objects communicates in complex but well-defined ways. Custom behavior distributed between several objects is required without subclassing. A snapshot containing enough information regarding the state of an object can be saved so that it can be restored to the complete state using the snapshot information later. Using a direct interface to obtain the state would impose implementation details that would break the rules of encapsulation for the object. A change to an object requires changing other objects, and the number of objects that need to be changed is unknown. An object needs to notify other objects without making any assumptions about the identity of those objects. The behavior of an object depends on its state and it must be able to change its behavior at runtime according on the new state. Operations have large multipart conditional statements that depend on the state of the object. Multiple classes differ only in their behavior. You need different variations of an algorithm. An algorithm uses data that is unknown to the client. You want to implement the nonvarying parts of an algorithm in a single class and the varying parts of the algorithm in subclasses. Common behavior among subclasses should be moved to a single common class, avoiding duplication. An object structure contains many objects with differing interfaces and you need to perform operations on these objects in a way that depends on their concrete classes. Many distinct and unrelated operations need to be performed on objects in a structure and you need to avoid cluttering the classes with these operations. The classes defining the object structure rarely change but you frequently need to define new operations that perform over the structure.
Appropriate Design Pattern
Mediator
Memento
Observer
State
Strategy
Template Method
Visitor
5: Design Patterns
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:
n Presentation Tier n Business Tier n Integration Tier
Presentation Tier J2EE Patterns
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:
n Composite View n Dispatcher View n Front Controller n Intercepting Filter n Service To Worker n View Helper
The next table lists scenarios along with suggestions of one or more of the presentation tier J2EE patterns to aid in the solution.
Business Tier Patterns
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:
n Business Delegate n Composite Entity (formally Aggregate Entity) n Service Locator n Session Facade n Transfer Object (formally Value Object)
Identify the Most Appropriate Design Pattern
SCENARIO & SOLUTION
Given Scenario
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
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