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principles:dependency_inversion_principle [2013-04-03 14:22] – [Evidence] christianprinciples:dependency_inversion_principle [2021-09-02 19:24] – old revision restored (2021-05-11 21:48) 65.21.179.175
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 ===== Principle Statement ===== ===== Principle Statement =====
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-Depend on abstractions.((Robert C. Martin: //Agile Software Development, Principles, Patterns, and Practices//, p. 129)) 
  
  
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 ===== Strategies ===== ===== Strategies =====
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-  * Apply the [[patterns:Dependency Inversion]] Pattern 
-  * Apply other forms of [[glossary:dependency inversion]] 
-  * Have an ''interface'' type for every class 
-  * Declare only ''interface'' types so that an object variable generally has an ''interface'' as static type and a concrete class as dynamic type 
- 
- 
-===== Caveats ===== 
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-It is normally not helpful to apply DIP to [[patterns:value objects]]. 
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-Furthermore note that applying [[patterns:dependency inversion]] pattern (see [[#strategies]]) introduces an abstraction. FIXME explain Super-A vs. ReqByB 
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-See section [[#contrary principles]]. 
  
  
 ===== Origin ===== ===== Origin =====
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-Robert C. Martin: //[[http://www.objectmentor.com/resources/articles/oodmetrc.pdf|Object Oriented Design Quality Metrics: an analysis of dependencies]]// 
  
  
 ===== Evidence ===== ===== Evidence =====
 /* Comment out what is not applicable and explain the rest: */ /* Comment out what is not applicable and explain the rest: */
- +/* 
-/*  * [[wiki:Proposed]]*/ +  * [[wiki:Proposed]] 
-/*  * [[wiki:Examined]]*/ +  * [[wiki:Examined]] 
- +  * [[wiki:Accepted]] 
-[[wiki:Accepted]]: DIP is part of the well-know [[collections:SOLID]] principle collection. +  * [[wiki:Questioned]] 
- +*/
-/*  * [[wiki:Questioned]]*/ +
  
 ===== Relations to Other Principles ===== ===== Relations to Other Principles =====
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   * [[Model Principle]] (MP): DIP demands having abstractions. MP tells how these abstractions can look like.   * [[Model Principle]] (MP): DIP demands having abstractions. MP tells how these abstractions can look like.
 +  * [[Encapsulate the Concept that Varies]] (ECV): 
  
 ==== Principle Collections ==== ==== Principle Collections ====
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 {{page>collections:SOLID#Box}} {{page>collections:SOLID#Box}}
  
-===== Examples =====+===== Example =====
  
  
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 ===== Further Reading ===== ===== Further Reading =====
  
-  * Robert C. Martin: //[[http://www.objectmentor.com/resources/articles/oodmetrc.pdf|Object Oriented Design Quality Metrics: an analysis of dependencies]]// 
-  * Robert C. Martin: //Agile Software Development, Principles, Patterns, and Practices// 
-  * [[http://www.butunclebob.com/ArticleS.UncleBob.PrinciplesOfOod|ButUncleBob: Principles of OOD]] 
-  * [[wiki>DependencyInversionPrinciple]] 
-  * [[wp>Dependency inversion principle]] 
  
principles/dependency_inversion_principle.txt · Last modified: 2021-10-18 21:23 by christian