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You can also use Proxies to keep copies of large objects that may or may not change If you create a second instance of an expensive object, a Proxy can decide that a copy is not needed yet, so it simply uses the original object Then, if the program makes a change in the new copy, the Proxy can copy the original object and make the change in the new instance This can save time and space when objects do not always change after they are instantiated
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Enterprise Java Beans
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Enterprise Java Beans (EJB) are a set of classes and interfaces for writing well-encapsulated server code They are not at all related to the Java Beans you use in client GUI programs However, they do supply a convenient approach for accessing databases and other legacy data systems Each time you request a line of data from a database, you are making a new connection to an EJB Clearly, there are a limited number of these connections available, so the remaining requests are cached within the Bean and a Proxy to the connection that eventually becomes the connection when one becomes available is returned
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Comparison with Related Patterns
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Both the Adapter and the Proxy patterns constitute a thin layer around an object However, the Adapter provides a different interface for an object, whereas the Proxy provides the same interface for the object but interposes itself where it can postpone processing or data transmission effort A Decorator also has the same interface as the object that it surrounds, but its purpose is to add additional (sometimes visual) function to the original object A Proxy, by contrast, controls access to the contained class
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lightbulb Thought Question
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1 You have designed a Java server that connects to a database If several clients connect to your server at once, how could Proxies be of help
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Programs on the CD-ROM
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Summary of Structural Patterns
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Following is a summary of the Structural patterns:
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Adapter pattern changes the interface of one class to that of another Bridge pattern separates a class's interface from its implementation so that you can vary or replace the implementation without changing the client code Composite pattern a collection of objects, any one of which may be aComposite or a leaf object Decorator pattern a class that surrounds a given class, adds new capabilities to it, and passes all of the unchanged methods to the underlying class Fa ade pattern groups a complex set of objects and provides a new, simpler interface to access those objects Flyweight pattern provides a way to limit the proliferation of small, similar instances by moving some of the class data outside of the classand passing them in during various execution methods Proxy pattern provides a simple placeholder object for a more complex object that is in some way time-consuming or expensive to instantiate
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Section 4: Behavioral Patterns
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Behavioral patterns are those patterns that are most specifically concerned with communication between objects This chapter covers the following patterns:
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Chain of Responsibility pattern allows decoupling between objects by passing a request from one object to the next in a chain until the request is recognized Command pattern utilizes simple objects to represent the execution of software commands and allows you to support logging and undoable operations Interpreter pattern provides a definition of how to include language elements in a program Iterator pattern formalizes the way we move through a list of data within a class Mediator pattern defines how communication between objects can be simplified by using a separate object to keep all objects from having to know about each other Observer pattern defines how multiple objects can be notified of a change State pattern allows an object to modify its behavior when its internal state changes Strategy pattern encapsulates an algorithm inside of a class Template Method pattern provides an abstract definition of an algorithm Visitor pattern adds polymorphic functions to a class noninvasively
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