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The key difference between the Adapter and Bridge design patterns lies in their intents. From Design Patterns, chapter 4, section ‘Bridge’, paragraph ‘Related Patterns’ (Gamma et al. 1994): The Adapter (139) pattern is geared toward making unrelated classes work together. It is usually applied to systems after they’re designed.
Bridge: It is structural pattern; it decouples an abstraction from its implementation so that both can vary independently; You have four components in this pattern as explained Gang of Four Design patterns book ( page: 174 ) Abstraction: defines the abstraction's interface. RefinedAbstraction: extends the interface defined by Abstraction
4. Strategy Pattern is used for Behavioural decisions, while Bridge Pattern is used for Structural decisions. Brigde Pattern separats the abstract elements from the implementation details, while Strategy Pattern is concerned making algorithms more interchangeable. Strategy Pattern in UML. Brigde Pattern in UML.
There's nothing wrong with adding two Bridge relationships to one abstraction (beyond the complexity of juggling three different hierarchies). Decorator would certainly not work for this purpose, because it maintains a single hierarchy, which is known to the client.
The main difference (even though both patterns have the same UML) is that unlike the bridge pattern (which is a structural pattern), the strategy pattern is a behavioral pattern. Structural patterns suggest ways in which objects are composed or associated or inherited to forms larger objects i.e. they focus on object composition.
Yes, the intent of the Bridge patter is to decouple abstraction (i.e., interface) from implementation, to let them vary independently. In practice, the idea is to use two separate hierarchies instead of the classic single hierarchy. Let's make an example. Suppose that you have a Window abstraction, and you need to create an IconWindow subclass ...
Bridge tries to decouple an abstraction from its implementation, and make both independet to vary when needed. Bridge is a synonym for the "handle/body" idiom. This is a design mechanism that encapsulates an implementation class inside of an interface class. The former is the body, and the latter is the handle.
If the #include dependencies are such that touching this header file causes a large number of sources to be recompiled, you have a good candidate for PIMPL. So the Bridge pattern is about object-oriented design, while the PIMPL idiom is about physical design of files. (For more on physical design, I recommend the book Large-Scale C++ Software ...
UML diagram of Bridge from wikipedia: From UML diagram, you can observe the difference: In Decorator pattern, Decorator is implementing Component, which will be replaced by ConcreteComponent at run time. In Bridge pattern, RedefinedAbstraction is not implementing Implementor.
Many Design Patterns have similar UML diagrams. The Bridge Pattern is completely different than Dependency Injection. Dependency Injection - A way to easily insert (and swap) dependencies in code either at runtime or compile time. Bridge Pattern - A way to have an extra interface between different systems. The Bridge is the communication layer ...