DenkzeitWiki

Inversion Of Control

LooseCoupling
ObjectBuilder
CodeInjection Also, and prefered by MartinFowler, DependencyInjection.

• http://codebetter.com/blogs/jeremy.miller/archive/2005/09/13/131897.aspx --Inversion of Control with the Plugin Pattern
  • Hollywood Principle
    • Don't call us, we'll call you
  • The general idea being that you extend the existing behavior of a framework by creating a class implementing an interface from the framework. Your new class doesn’t call the framework; the framework code calls the new class.
  • via http://codebetter.com/blogs/jeremy.miller/archive/2005/09/20/132290.aspx
• Wikipedia:Inversion_of_Control
• http://martinfowler.com/articles/injection.html --Inversion of Control Containers and the Dependency Injection pattern
  
  
• http://peak.telecommunity.com/DevCenter/InversionOfControl

dependency injection: When an object is created, it is given its dependencies, rather than making them on its own.

• The Dependency Inversion Principle

DependencyInjection in DynamicLanguages

• via [1]
  • http://relevancellc.com/2007/8/1/dependency-injection-in-one-sentence

Dependency injection is a palliative for environments that unnecessarily couple creation, lookup, and interaction between collaborators.[2]

• http://onestepback.org/index.cgi/Tech/Ruby/DependencyInjectionInOneSentence.red

Dependency injection provides vital flexibility in Java and unneeded overhead in Ruby.[3]

How about: “Dependency Injection” seemed an amazing insight to people who had finally learned what constructor arguments were for.[4]

• http://memeagora.blogspot.com/2007/08/dependency-injection-in-one-sentence.html

Dependency Injection enables a vitally important but nevertheless weak, limited, syntactically confounding, and dauntingly complex form of one of the kinds of meta-programming that should exist in the language.[5]

• via [6]
  • Dependency Injection: Vitally Important or Totally Irrelevant?
    • somewhere, the implementation must be injected
      • Factories
      • Service Locators
      • DependencyInjection -> ObjectBuilder
        • Classes are objects - can be passed around (e.g. into Factory), can be replaced (MonkeyPatching)
    • gets useful in DynamicLanguages with large projects
  • Net::SSH revisited
    • getting rid of DependencyInjection in a Ruby-library