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Lars Strojny's Blog:
Dependency Injection Container Refactorings, Part One
April 20, 2011 @ 10:27:12

New on his blog today Lars Strojny has posted the first part of his look at dependency injection and how he's been using it to do some refactoring in his applications. He uses the Symfony DI container in his examples, but really you can apply the principles to just about any of the other current DI offerings.

Working heavily with the Symfony2 Dependency Injection Container, I feel that we found some typical refactorings towards a DI container that emerge during the introduction of such a component. I want to write down the preliminary results of trying to systematize more or less as a draft. I will use the Symfony2 DI container configuration as an example but most of the refactorings should be applicable to other containers as well, some of them even to dependency injection without a container.

He's broken it up into a few different sections:

  • Making a dependency explicit
  • Introducing interface injection
  • Exposing the service
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