I use both anonymous PK's and FK's. But the use i do of anonymous
primary keys is limited to objects that belongs to collections of
main objects. Main objects have *real* primary keys and only
these ones are used directly in the broker (all collections are
prefetched) and cached. So i think that using anonymous pk's in
my case is safe (if my understanding is good, problems can arise
when using anonymous pk's in distributed environnments).
So the main problem is the caching system
for anonymous keys (either pk or fk) :
* keys are kept in a cache specific to the field
* this cache can not be accessed by any means so no clear
is possible
* this cache can not be a per-broker cache
* anonymous persistent fields implementation
can not be extended or overriden
I'm willingfull to help refactoring this part, but i'd like to
have guidelines on how to do it...
I think it would be great
if anonymous keys are integrated within the existing cache system,
but i have no ideas on how to do it.
Guillaume
-----Message d'origine-----
De : Brian McCallister [mailto:[EMAIL PROTECTED]
Envoyé : jeudi 22 avril 2004 14:06
À : OJB Users List
Objet : Re: Problem with clearing cache
Anonymous PK's are risky things -- I apologize for using them in the
original anonymous keys tutorial. Anonymous FK's are great, and not
using them is usually a bad ida in my opinion =)
I don't think the anonymous PK issues you are having will be resolved
very soon, the anonymous key functionality wasn't really designed for
PK usage, but for FK usage. I completely feel that it would be good to
be able to use them for PK's as well, but my slate is full at the
moment with JDO stuff =(
I don't know about everyone else. Any chance *you* want to dig into it?
;-)
-Brian
On Apr 22, 2004, at 7:55 AM, Guillaume Nodet wrote:
> It also seems that cached anonymous keys are not removed from
> the cache when an object is deleted from database.
> Will these problems be solved, or should i try not to use
> anonymous keys ?
>
> Guillaume
>
> -----Message d'origine-----
> De : Guillaume Nodet [mailto:[EMAIL PROTECTED]
> Envoyé : mercredi 21 avril 2004 14:42
> À : OJB Users List
> Objet : Problem with clearing cache
>
>
> I need to clear the ojb cache at some point in my program
> (namely after deleting all data in the database).
> The problem i have is that i use anonymous primary keys and
> the caches associated with the anonymous fields are not cleared.
> Would it be possible to had some mean of clearing these caches ?
>
> The problem is that at some time, i've got errors when inserting
> objects. I think that the key for the failing object is in cache
> but not in the database so when a foreign key references it,
> the insertion fails.
>
> Thanks,
> Guillaume Nodet
>
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