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Fabien Potencier's Blog:
Do you need a Dependency Injection Container?
Mar 30, 2009 @ 11:13:48

Following up on the previous part of his dependency injection series (the first part), Fabien Potencier has come back with this second look at the development technique asking if you really need a dependency injection container in your scripts.

In the first installment of this series on Dependency Injection, I have tried to give concrete web examples of Dependency Injection in action. Today, I will talk about Dependency Injection Containers. First, let's start with a bold statement: Most of the time, you don't need a Dependency Injection Container to benefit from Dependency Injection.

A dependency injection container is a wrapper around classes/libraries that need certain types of objects and settings to make them work correctly. This wrapper gathers together the information the object inside needs automatically without the user of the library having to worry they've missed something. Several code examples are included showing an application both with and without the container.

tagged: dependency injection container need requirements object library