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1. Change Example 2-3 so that the Client does not inherit from the Program, but rather creates an instance of it. 2. If you are a GUI programmer, turn the SpaceBook system into something more visually appealing. You can either replace the methods in SpaceBook (the subject) to draw frames in windows and so on, or add decorators, leaving the existing component as it is. 3. The SpaceBook system as it stands lacks a real friends facility; at the moment, a user has access to all the other books on the system. Improve SpaceBook so that friends can be added and then operations such as Poke can be done only on users who have been declared (and accepted as) your friends. Carefully design your improvements so that code goes in the right place SpaceBook (the subject) or MySpaceBook (the proxy).
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4. Another type of online community network holds photos (an example is Flickr). Users upload photos, which all others can view but only friends can download or comment on. Sketch out the use of the Proxy pattern for such a system. 5. Consider how to monitor an activity on a library. For example, supposing a third-party library expects a Stream class, you could implement your own MyStream class that intercepts, monitors, and logs every call to Stream methods. Write a short test program that uses the Proxy pattern to illustrate this idea.
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Bridge Pattern
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The Bridge pattern decouples an abstraction from its implementation, enabling them to vary independently. The Bridge pattern is useful when a new version of software is brought out that will replace an existing version, but the older version must still run for its existing client base. The client code will not have to change, as it is conforming to a given abstraction, but the client will need to indicate which version it wants to use.
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Consider the rolling out of a new version of the .NET Framework used to compile and run C# 3.0. You can have several versions of the Framework loaded on your computer at any time and can select which one to use by externally setting a path to it in the Windows operating system. Setting the path is the bridge between what applications want from the Framework and the actual version they will get. In Figure 2-6, you can see that there are five versions of the Framework loaded on my computer. Figure 2-7 shows that the one the system is being directed to is Version 3.5, which includes the C# 3.0 compiler.
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Design
Inheritance is a common way to specify different implementations of an abstraction. However, the implementations are then bound tightly to the abstraction, and it is difficult to modify them independently. The Bridge pattern provides an alternative to inheritance when there is more than one version of an abstraction. Consider the UML diagram in Figure 2-8. The two implementations, A and B, implement an interface called the Bridge. The Abstraction includes an attribute of type Bridge but is not otherwise in a relationship with the implementations.
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2: Structural Patterns: Decorator, Proxy, and Bridge
Bridge Pattern
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Client
Abstraction bridge +Operation( )
<<interface>> Bridge +OperationImp( )
Calls OperationImp in bridge
ImplementationA +OperationImp( )
ImplementationB +OperationImp( )
From this diagram, we can see that the role players for the Bridge pattern are:
Abstraction
The interface that the client sees
Operation
A method that is called by the client
Bridge
An interface defining those parts of the Abstraction that might vary
ImplementationA and ImplementationB Implementations of the Bridge interface OperationImp
A method in the Bridge that is called from the Operation in the Abstraction As we noticed with the Decorator pattern, there can be several implementations for the one abstraction. Legacy implementations do not have to implement the Bridge if they are still going to be instantiated in the old way; they need to do so only if they must be used interchangeably with the new implementations.
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