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From Peter Donald <>
Subject Re: myrmidon questions
Date Wed, 16 Jan 2002 08:24:59 GMT
On Wed, 16 Jan 2002 19:03, Peter Donald wrote:
> > Is there any concept of role sub-typing?  Given that a role maps
> > one-to-one to a java type (only to an interface?), and java types can be
> > sub-typed, maybe it makes sense to introduce such a concept.  Certainly,
> > if we did, then the 'magic' of the type manager goes away.
> There used to be. Originally classes just registered and you did something
> like "give me an instance of class X with name Y". However this proved to
> be extremely complex - I was actually warned against it by the Cocoon
> developers who faced a similar design problem. It ended up that they were
> right and I simplified it to what we have now.
> Now it is much easier to determine what you get when you ask with a
> component with a certain role. Previously it was much mre ickier -
> especially as roles/interfaces allow multiple inheritance/implementation.

Though it may be worth trying because I like subtypes better than the idea of 
a magic container ;)



"It is easy to dodge our responsibilities, but we 
cannot dodge the consequences of dodging our 
responsibilities." -Josiah Stamp 

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