Re: N-tier development and modeling

Sender: John Lenton <[email protected]>

On Sun, Mar 14, 2004 at 02:37:06PM +0100, Sebastien Bigaret wrote:
> I must say all this is really interesting. I unfortunately do not have
> the time to investigate such things deeper, but i'm really interested in
> a distributed layer. Had a very quick look at pyro, seems compact and
> clean. If any of you experiment in this direction I'd like to hear from
> the details, problems etc. As far as I can understand things, it seems
> that Tom and John are speaking about similar things, if not the same.
> 
>   BTW about weakrefs and pickle, I can effectively confirm that weakrefs
>   are used, mainly in objects (which hold a weakref to their EC) and in
>   to-many faults (AccessArrayFaultHandler) which for technical reasons
>   hold weakref of the object referencing them.

I've been thinking about this a bit (`in background', if you will),
and now I am of the opinion that actually using pyro on
editingcontexts and modeling objects is the wrong way to do this; I
think proxy classes (via overriding CustomObject?) is probably a saner
way to go. You probably don't want to shuttle your modeling objects
anyway: what you're wanting to distribute is the data, i.e. the result
of e.g. getFirstName, and possibly (although I doubt it) the effect of
setFirstName. Not the object itself; that would imply you are
distributing your business logic. I'll try to set up an example using
cimarron, so you can see what I mean.

> John: after a quick search I was not able to find any english-written
> resources about papo and cimarron, is this available somewhere?

papo is https://papo.vialibre.org.ar, but as you noted it's in
spanish. cimarron you can find in papo's savannah cvs; I'm afraid it's
lacking documentation and examples, and probably isn't much use
without a bit of handholding. However, it being a framework, we've
tried to keep it in english, so at least running pydoc on the files in
Generic/ should provide some insight. Consider it 'pre-alpha', because
it is.

-- 
John Lenton ([email protected]) -- Random fortune:
"In the long run, every program becomes rococo, and then rubble."
-- Alan Perlis


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