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The Decorator pattern provides the same contract for a class but with extended functionality. The pattern is used when functionality needs to be added to objects dynamically. The solution involves encapsulating the original object inside an abstract wrapper interface. Both the decorator objects and the base object inherit from this abstract interface. The interface is generic such that it allows a theoretically unlimited number of decorative layers to be added to each base object. Decorators would seem to be especially useful when you wish to add functionality when you do not have the actual code source of the class. If you know enough about the object that is, the interface when you want to decorate, you can provide a decoration for it. It is important to note that the decorator is a subclass of the component class that it decorates. This is counterintuitive because the instance is a parent of the component it decorates. Decorators share the wrapper approach. The difference, however, is intent. The decorator has value only if it changes the behavior of the wrapee. The EJBObject is a decorator for the bean because the bean s functionality is expanded to include remote behavior.
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The Factory Method pattern (as shown in Figure 4-9) provides the ability to define an interface for creating an object but defers instantiation to subclasses. JEE technology uses this pattern for the EJBHome interface, which creates new EJBObjects. (For more information, see 5 and perhaps consult the book Design Patterns: Elements of Reusable Object-Oriented Software by Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides [Addison-Wesley, 1995].)
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The Abstract Factory pattern provides an interface for creating families of related or dependent objects without specifying concrete classes. JEE technology uses this pattern for the EJBHome interface, which creates new EJBObjects.
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EXERCISE 4-2 Patterns in the JEE Framework and Development
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Question Describe the use of patterns in the JEE framework and development. Answer A pattern is a recurring solution to a problem in a context. A context is the environment, surroundings, situation, or interrelated conditions within which something exists. A problem is an unsettled question, something that needs to be investigated and solved. A problem can be specified by a set of causes and effects. Typically, the problem is constrained by the context in which it occurs. Finally, the solution refers to the answer to the problem in a context that helps resolve the issues. In addition to the framework patterns used by JEE, patterns are used in development and are typically listed according to functionality. The presentation tier patterns contain the patterns related to servlets and JSP technology. The business tier patterns contain the patterns related to the enterprise beans technology. The integration tier patterns contain the patterns related to JMS and JDBC. Tables 4-3, 4-4, 4-5, and 4-6 contain partial lists of applicable patterns along with descriptions to provide a highlevel overview of the patterns. The presentation tier patterns, business tier patterns, and integration tier patterns will all be discussed in detail in later chapters.
4: Applicability of JEE Technology
TABLE 4-3
Pattern Name
Proxy
Description
Provides method calls to a principal object to occur indirectly through a proxy object that acts as an agent for the principal object, delegating method calls to that object Extends the functionality of a class such that it s transparent to its clients Provides a reusable class independent of the classes it instantiates, because it delegates the choice of which class to instantiate to another object, referring to the newly created object via common interface Provides a way to create instances of those abstract classes from a corresponding set of concrete subclasses
JEE Implementation
EJB remote interface
Framework Patterns
Decorator
EJBObject
Factory Method
EJBHome interface
Abstract Factory
EJBHome interface
TABLE 4-4
Pattern Name
Decorating Filter Front Controller View Helper Composite View Service To Worker Dispatcher View
Description
Facilitates pre- and post-processing of a request Provides a centralized controller for managing the handling of a request Encapsulates logic that is not related to presentation formatting into Helper components Creates an aggregate View from atomic subcomponents Combines a Dispatcher component in coordination with the Front Controller and View Helper Patterns Combines a Dispatcher component in coordination with the Front Controller and View Helper Patterns, deferring many activities to View processing
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