[TYPO3-mvc] Question about DI and current component wiring method

[Robert Lemke]

Hi Xavier,

Am 05.08.2009 um 10:34 schrieb Xavier Perseguers:

> A question arised in my head this morning regarding Dependency  
> Injection
> and I could not find an answer... I understand it and is described  
> as a
> way to prevent having explicit dependency on other classes.
>
> Great! But this means the purpose of this is not to have any  
> dependency
> and be able to change the actual class implementing a feature by
> another. Now, could someone explain me how it is supposed to work
> _actually_? I mean, suppose I want to provide my own implementation of
> feature X from Extbase, how am I supposed to change the wiring of
> components from Extbase? I don't see as all wiring is done with  
> convention.
>
> Is this supposed to be left as this for Extbase? Does FLOW3 have  
> wiring
> over configuration instead? Or in addition? I must admit I did not do
> much FLOW3 as Extbase came quite at the "good" point of time ;-)

In practice you would prefer programing to interfaces: Instead of  
injecting
an object of specific class you would rather depend on an interface:

/**
  * @var \F3\FLOW3\Object\ManagerInterface
  * @inject
  */

In FLOW3 you can tweak the actual implementation by altering the  
configuration
in an Objects.yaml file:

\F3\FLOW3\Object\ManagerInterface:
   className: \F3\MyPackage\Object\ManagerPlusPlus

You see?

robert