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From Yannick Menager <ymenager...@fastmail.fm>
Subject Re: Merlin runtime plugins
Date Wed, 12 Nov 2003 17:38:01 GMT
Stephen McConnell wrote:

> Can you explain in more detail what you mean by a plugin.  There are 
> several access points in Merlin already and more comming - but an 
> outline of what you want to do will help.

Well, like implementing something like Idea's plugin framework for example.

> If you want to select something then presumably you have some selection 
> criteria in mind. A generic container such as Merlin does not know what 
> you intentions are nor anything about a selection criteria or candidate 
> ranking strategy.  What this means is that you need to supply this logic 
> though a service defintion and an implementation.

Well, the thing is, I want that the components can register themselves, 
so that I can give the user a list of options.

> 
> I.e. define your seelction service:
> 
>   public interface MySelectionService
>   {
>          Thing selectSomething( MyCriteria criteria );
>   }
> 
> The define you component that implements MySelectionService and includes 
> all of the selection semantics that are specific to the domain you are 
> concerned with.
> 
> Limitation: as you mentioned Merlin requires that you declare 
> dependencies for a component at the level of a type (i.e. dependencies 
> are static).  This means that if you want to slect against a merlin 
> establish service, then you need to declare dependencies on all of the 
> different potential types that you are going to select against.  This is 
> ok in scenarios such a keystor and you selecting between a personal 
> keystore for signing as opposed to a keystore for trusted keys (i.e. the 
> selection set is static).  If the selection set is dynamic then you need 
> to roll-your-own solution ... at least for the moment.  A similar 
> requirement exists in the Turbine Fulcrum project and its a subject I've 
> been working on - i.e. if you not in a desperate hurry then you get this 
> for free sometime soon.
> 
> Cheers, Steve.
> 

Yup.... that sounds like what i need lol ;) oh well.. I guess i'll 
hardcode for now ;)



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