[cap-talk] Object capabilities versus dependency injection.

[Rob Meijer]

Given this, (this could be a real dumb question) how realistic and/or
beneficial to dependency injection would it to for example for java and
dependency injection to use both (a tamed?) Spring and Joe-E together and
advocate Joe-E as primary as a powerful dependency injection tool?



On Fri, November 21, 2008 05:51, John Carlson wrote:
> A lot of dependency injection in Java is done with Spring Framework/
> XML or annotations.
> The idea is to declare an interface, and then provide an
> implementation at runtime, instead
> of hard-coding in the implementation.
>
> I think the thing that will make your code better is to write the
> tests first...then people will use dependency injection more often.
> However, Java testing frameworks have become more sophisticated over
> time, so for example, I can set up my dependency injection in Spring,
> and provide a test XML file for test code.  The setup for spring is
> done in advance of the tests in the test setup.
>
> I would say that ocap discipline and dependency injection discipline
> are very similar.  Perhaps static methods should be deprecated, except
> for factories.  You can also pass Importers to your constructors.
> This might be thought of as a small factory used to set internal state
> of an object.  This allows you to get rid of the setters and getters
> on the classes which you are trying to hide so that your datatype is
> opaque.
>
> John
>
> On Nov 20, 2008, at 1:50 PM, Rob Meijer wrote:
>
>> I just watched a video on youtube about singletons and dependency
>> injection.
>>
>> http://www.youtube.com/watch?v=-FRm3VPhseI
>>
>> It would seem that there are very high similarities at least between
>> object capabilities and dependency injection. Does anyone know
>> sufficient
>> on dependency injection to compare it to object capabilities.
>>
>> It would, with my limited understanding of dependency injection seem
>> like
>> ocap languages would be the perfect way to do dependency injection.
>>
>> If the similarities are truly that big as they apear to be, couldn't
>> dependency injection be a potential channel by what to promote object
>> capability usage to a wider public?
>>
>> Rob
>>
>> _______________________________________________
>> cap-talk mailing list
>> cap-talk at mail.eros-os.org
>> http://www.eros-os.org/mailman/listinfo/cap-talk
>
> _______________________________________________
> cap-talk mailing list
> cap-talk at mail.eros-os.org
> http://www.eros-os.org/mailman/listinfo/cap-talk
>
>