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Patterns

Patterns. idea was first put forth by Christopher Alexander (1977) in his work on architectural design principles a pattern is a named problem/solution pair that can be applied in new contexts advice from previous designers to help designers in new situations rules of thumb - not new ideas

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Patterns

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  1. Patterns • idea was first put forth by Christopher Alexander (1977) in his work on architectural design principles • a pattern is a named problem/solution pair that can be applied in new contexts • advice from previous designers to help designers in new situations • rules of thumb - not new ideas • Design Patterns - Erich Gamma et al 1995 • Ch 26: Adapter, Factory, Singleton, Façade, Strategy, Composite, Decorator, Observer • Ch 35: Proxy, Abstract Factory • Ch 38: Template Method, State ACS-3913 Ron McFadyen

  2. Guiding principles to help us assign responsibilities GRASP: General Responsibility Assignment Software Patterns fundamental, simple, basic principles of object design. Developed by Craig Larman GRASP Patterns Fundamental Principles of Object Design ACS-3913 Ron McFadyen

  3. Expert Creator Controller Low Coupling High Cohesion Polymorphism Pure fabrication Indirection Protected variations GRASP Patterns ACS-3913 Ron McFadyen

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