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From: "Carsten Ziegeler" <cziegeler@s-und-n.de>
To: "'Avalon Developers List'" <dev@avalon.apache.org>
Cc: <dev@cocoon.apache.org>
Subject: RE: ECM facility
Date: Wed, 10 Mar 2004 07:40:25 +0100
Organization: S&N AG
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Hi Stephen,

I had a quick glance at your finder stuff but are absolutely clueless
what I should do with it :) I guess from your description that if this
finder is used inside Merlin I can use the ECM configuration files
for defining my components. Is this right?
Is there any sample etc. that shows how to start Merlin including
the finder?

Carsten 

> -----Original Message-----
> From: Stephen McConnell [mailto:mcconnell@apache.org] 
> Sent: Tuesday, March 09, 2004 2:20 AM
> To: Avalon Developers List
> Cc: dev@cocoon.apache.org
> Subject: ECM facility
> 
> 
> I've just committed some content into the merlin/facility 
> directory dealing with a pull-based service finder 
> implementation.  This commit is dealing with two things:
> 
>    (a) an example of the addition of a semantic extension to
>        merlin without modification or extension to the container
>        through the definition of a "finder" facility - the facility
>        specifically address dynamic pull-based service activation
>        (as per ECM and Fortress)
> 
>    (b) an experimental implementation of a ECM component - in
>        particular a component that exposes the ServiceManager as
>        its service interface
> 
>          - configurable with an ECM config file
>          - dependent on a finder service
>          - dependent on a RoleManager
> 
>        this RoleManager encapsulates the construction of a formal
>        meta model implied by the ECM object model - in particular,
>        the definition of the Role and Hint immutable data types
> 
> I've also put in place a test framework that will enable the 
> testing and validation of a client invoking runtime requests 
> for services backed by standard components (full 
> meta-descriptors), together with ECM style solutions.
> 
> I'm not at the point where I need to start dealing with 
> service requires
> - and that means putting some content into some of the ecm 
> component service methods - but more importantly - code 
> dealing with the transformation of an ECM lookup argument 
> into something that makes sense to the finder service is 
> where the real ECM semantics will be captured.
> 
> The code is committed under:
> 
>     avalon/merlin/facilities/finder
> 
> This is composed of the following sub projects:
> 
>     * api  - definition of a Finder service interface
>     * impl - definition of a default finder implementation
>              that dynamically resolves services using
>              avalon-composition
>     * ecm  - skeleton implementation of an ECM service provider
>              that deals with pure ECM role files and related
>              configuration content
>     * test - an initial test framework
> 
> At this point any help (code, tests, opinions, etc.) would be 
> *very* much appreciated.
> 
> Cheers, Steve.
> 
> p.s. content is very initial
> scope and potential for change is wide open
> 
> -- 
> 
> |------------------------------------------------|
> | Magic by Merlin                                |
> | Production by Avalon                           |
> |                                                |
> | http://avalon.apache.org/merlin                |
> | http://dpml.net/merlin/distributions/latest    |
> |------------------------------------------------|
> 
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