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| #language en = Dependency Injection Pattern = The Dependency Injection Pattern, is described in [[http://www.martinfowler.com/articles/injection.html|Martin Fowler's article]]. It is closely related to the DependencyInversionPrinciple and the so called Inversion of Control (IoC) containers. IoC is aimed at loosening the coupling of application components. The key concepts are: * Components do not know each other directly. * Components specify external dependencies using some kind of a key. * Some "superior instance" (the IoC container, for example) resolves the dependencies once for each component and hereby "wires" the components together. It is quite a challenge to implement an IoC container for statically typed languages. In python, however, the core concepts can be implemented quite easily. [[http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/413268|DependencyInjectionThePythonWay]] describes how. == See Also == [[http://peak.telecommunity.com/DevCenter/InversionOfControl|PEAK:InversionOfControl]] -- Inversion of Control is a more general concept (small components relinquishing control, or networking control, rather than maintaining it internally,) but the name was overloaded historically to mean what is named by DependencyInjectionPattern. [[PEAK]] makes use of dependency injection, and the larger meaning of "Inversion of Control." The target page describes dependency injection. == Discussion == |
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