[cap-talk] Object capabilities versus dependency injection.

[John Carlson]

I'm not that familiar with Joe-E.  How are dependencies injected with  
Joe-E?
Spring comes with a lot of classes for setting stuff up like data  
sources, transactions etc.
You would probably have to tame those.  But you could start fresh with  
just the basic
Spring Framework.  Joe-E would have to have the capability to read the  
XML file.
Or you could use annotations if Joe-E accepts those.

John

On Nov 20, 2008, at 11:30 PM, Rob Meijer wrote:

> 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
>>
>>
>
>
> _______________________________________________
> cap-talk mailing list
> cap-talk at mail.eros-os.org
> http://www.eros-os.org/mailman/listinfo/cap-talk