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From "Wolfgang Gehner" <wgeh...@infonoia.com>
Subject Re: Jackrabbit DBPersistenceManager
Date Mon, 22 Nov 2004 07:42:23 GMT
Hi David,

Thank you for your most welcome comments. I suggest we talk through them and
clarify certain items when we meet in Zurich tomorrow. I will then summarize
our discussion and next steps in this forum.

Best regards,

Wolfgang Gehner
www.infonoia.com

----- Original Message ----- 
From: "David Nuescheler" <david.nuescheler@gmail.com>
To: <jackrabbit-dev@incubator.apache.org>
Sent: Thursday, November 18, 2004 12:51 PM
Subject: Re: Jackrabbit DBPersistenceManager


> hi wolfgang,
>
> thanks a lot for contributing jdbc pm (persistence manager).
> after taking a first look at the code that you submitted
> personally i would like to have at least the
> following questions answered or issues resolved before
> i personally could vote +1 on the contribution. i am
> convinced that all of those issues/questions can be
> easily fixed/answered:
>
> -------
> first of all there seems an administrational issue
> that as far as i understand with respect to the
> fact that the contribution is a seperable contribution,
> we would need a CLA on file from you. for a patch
> this would not be necessary (please anybody correct me
> if i am wrong)
>
> ---
> what is the benefit of the additional abstraction using
> dao, especially since the generic (abstract) datamodel
> is mandated by the implementation of the pm, shouldn't
> repository and jsr-170 provide such abstraction already?
> personally, i would probably favour a more direct
> access to the db.
>
> ---
> should the empty class "MyHashmap" be removed or renamed?
> as far as i understand it may be useful for future
> extensibility however the classname doesn't inspire a
> clear intention ;) ?
>
> ---
> since you submitted a 15mb package of the entire modified
> svn tree we have problems finding out what and why
> exactly was added / modified (do you think it would be
> possible to just send us a zip of your additions?)
>
> ---
> what is the thought behind creating a dom to pass
> arguments from one java method to another? was this
> just a quick hack or is that a pattern?
>
> ----
> to me it looks like your pm does not support multivalue
> properties, references or binary values (am i wrong?).
> what concerns me about that is that those are important
> functional pieces of a repository.
> stefan hacked up one afternoon quite a while ago
> a prototype for a database driven pm, that was
> able to support the full functional spectrum of a
> repository and being much more lightweight at
> the same time.
> we are currently having internal discussion if we
> should commit that as an example on how we see
> an implementation of a jdbc pm that is very
> lightweight, fast and simple. obviously it requires
> a very abstract generic datamodel in the rdbms
> too...
>
> ----
> generally, i believe that the earlier proposed
> changes to the pm api, with respect to allow a
> pm to operate in a transactional
> fashion, as you suggested, will have quite
> a big impact. so i think it maybe still be
> worth waiting a little bit, until the pm api
> has "settled again" ;)
>
> -------
> this is probably not a complete list of
> questions/comments but it could be a
> starting point.
>
> another question that i have for the entire
> jackrabbit-dev-community:
> since it seems like a number of people started to
> implement jackrabbit pms and other
> extensions that maybe are not finished, should we
> create a section of the svn tree dedicated to
> experimental code in general? some sort of sandbox
> or proposals. experiences from other projects?
>
> additionally, since everybody received wolfgangs
> contribution, i would like to encourage everybody
> to use it and share their experiences.
>
> regards,
> david


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