Re: [fractal] Fractal packaging specification

[Philippe Merle <Philippe.Merle@xxxxxxx>]

Hi Emmanuel and Eric and all,

Emmanuel Cecchet wrote:
> 
> Hi Eric,
> 
> >here is a draft specification for Fractal packaging, which follows
> >from the discussions on the Fractal mailing list. Comments are
> >welcome, as well as ideas for source packages, legacy packages,
> >version management...
> >
> >
> I am not sure to understand what you exactly mean by legacy packages.
> One thing that seems to be missing in the spec is the support of
> multiple implementations of the same component. The example I have in
> mind is what we have in LeWYS. We have different implementations of the
> same probe according to the platform (cpu probe for Linux is plain Java
> whereas the Windows version requires native calls to a DLL).
> Would there be a way to include these different implementations in the
> same package and select the right implementation based on some criteria
> (system properties or specific values understood by the deployment
> mechanism) with a default choice if no property can be matched?
> Another approach is to consider that this has nothing to do with
> packaging and that it should be different components with a specific
> deployment extension to handle this.

For information, the packaging of a CORBA component addresses the kind
of requirements you explain. A CORBA component package could contain
several implementations and they are tagged with meta information like
OS name and version requirements. This is the role of the deployment
infrastructure to check and/or select the right implementation that
must be deployed on a host according meta data.

> 
> All suggestions are welcome to handle this issue.
> Emmanuel

A+
Philippe Merle
--
__________________________________________________
Dr. Philippe Merle - INRIA Scientist Researcher at
Laboratoire d'Informatique Fondamentale de Lille
UPRESA 8022 CNRS - U.F.R. I.E.E.A. - Batiment M3
Universite des Sciences et Technologies de Lille
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