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Applying UML and Patterns - Part 4 Elaboration Iteration 2 - More patterns

Chapter 23 More Patterns​

Chapter 25 GRASP: More Objects with Responsibilities​

Polymorphism​

  • Adapter, Command, Composite, Proxy, State, Strategy rely on Polymorphism.
  • Related patterns: Protected Variations.

Pure Fabrication​

  • Implementaing software classes tofabrication for software high cohension and low coupling
  • All GoF design patterns are Pure Fabrications.

Indirection​

  • Many GoF patterns, such as Adapter, Bridge, Facade, Observer, and Mediator
  • Protected Variations
  • Low Coupling
  • Many Indirection intermediaries are Pure Fabrications.

Protected Variations​

Benefits​

  • Extensions required for new variations are easy to add.
  • New implementations can be introduced without affecting clients.
  • Coupling is lowered.
  • The impact or cost of changes can be lowered.

  • Most design principles and patterns are mechanisms for protected variation, including polymorphism, interfaces, indirection, data encapsulation, most of the GoF design patterns, and so on.

  • In [Pree95] variation and evolution points are called “hot spots.”

  • Most design principles and patterns are mechanisms for protected variation, including polymorphism, interfaces, indirection, data encapsulation, most of the GoF design patterns, and so on.

PV is essentially the same as the information hiding and open-closed principles, which are older terms.

Chapter 26. Applying GoF Design Patterns​

  • Adapter

Chapter 39 Documenting Architecture: UML and the N+1 View Model​

4+1 Views

  • Logical

  • Process

  • Deployment

  • Data

  • Use Case view