Common design patterns (migang 16 May 2012)
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The document discusses various common design patterns used in software development, emphasizing their usefulness and providing resource links for further exploration. It mentions the tight coupling created by using 'new' in classes and suggests utilizing mocking tools for testing certain singleton patterns. Overall, the content aims to highlight best practices in coding through design pattern implementation.
Common design patterns (migang 16 May 2012)
- 1. Common Design Patterns Steve Smith @ardalis | ardalis.com Telerik http://flic.kr/p/4MEeVn
- 6. Actual Usage http://twtpoll.com/r/t7jzrx
- 7. (Of course there are many others!)
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- 13. Shameless Plug: But why would you Telerik JustMock can be intentionally write code usedcan mocktest with you to only and test certainSingletons tools? premium
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- 19. “new” creates tight coupling between classes http://flic.kr/p/aN4Zv
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- 21. Compile Time Runtime User Interface Database
- 22. Compile Time Runtime User Interface Helper Class Database
- 23. Compile Time Runtime User Interface Core Infrastructure IFooRepository SqlFooRepository Database
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- 36. Pending Archived Published
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- 40. Design Patterns in Action CODE
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Editor's Notes
- #3: General, reusable solutions to common problemsNot a complete, finished solutionA template, recipe, or approach to solving certain problemsEach has a specific name, so we can discuss common elements of design using a common vocabulary
- #4: Learning anything – a musical chord, a martial arts technique, etc.Zero: You used a what? Never heard of it.Awakening:Wow, I just learned how XYZ pattern can improve my design. I’m not really sure where it would work in my code, but I’m definitely looking.Overzealous:I totally “get” the XYZ pattern; I’m adding it everywhere I can shoehorn it into my code. My design’s gonna be better now, for sure!Mastery: In response to some specific design pain points, the XYZ pattern was a logical next step and was achieved through a simple refactoring.
- #5: Design pattern names provide placeholders or complex abstractions and sets of refactorings. Consider the difference between:We have some tight coupling to the database here. We can probably fix it if we apply these refactorings;extract an interface, extract a method, Extract a class,Replace local with parameterORLet’s apply the Repository pattern to fix it.
- #11: It’s possible for the new Singleton(); line to be called more than once.
- #29: http://en.wikipedia.org/wiki/File:Proxy_concept_en.svg
- #40: Apply patterns via refactoring,Not Big Design Up Front