[Zope-dev] Suggestions towards implementing an experimental protocol for cross-database persistent object references and multi-database Zopelications cross-database persistent object references and multi-database Zopelications

[Martijn Pieters]

At 05:58 17/11/99 , Phillip J. Eby wrote:
>After studying Jeffrey Shell's ZLDAP package, and the current ZODB system,
>in the light of recent conversations with Jim Fulton, a few lightbulbs went
>on with respect to the usefulness of multi-database Zopelications.  For
>example, wouldn't it be keen if regular Zope objects could 'store' object
>attributes that were actually LDAP entries?  Or SQL database records?  That
>would be pretty awesome.

I believe that Jim Fulton has let his mind wander over this already. The 
general implementation wasn't hard, he said, the problems arise in the 
details. How, for example, do you remove unreferenced objects from any such 
database? How do you find out if an otherwise unreferenced object in one 
database, is not referenced by another one.

Also, IIRC, there is an issue with caching and connections, and the 
question of when to close a connection to a referenced database. But as I 
was experiencing some jet-lag at the time, and didn't bring a memo 
recording when I spoke with Jim, I don't remember the full details.

--
Martijn Pieters, Web Developer
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