[Zope-ZEO] ZODB as a standalone server

[John D. Heintz]

I am just a few steps away from being able to package some example code 
that demonstrates how we are successfully :-) useing ZODB and omniORB to 
expose a CORBA application.

Basically, we have a Singleton CORBA object that acts as a Factory for 
"sessions".  Each session embodies a CORBA POA with single threaded 
policy, a ZODB Connection, and a ZODB Transaction and of course the 
CORBA objects representing the persistent objects from the DB.  Getting 
the CORBA threads to play well with ZODB Transactions was a bit of a 
pain.  That is where my Zope Proposal ExplicitTransactions came from.

The code that I plan on releasing doesn't depend of ExplicitTransactions 
so it should be useful with the current code base.

I am wrestling with a bug that I just reported to Zope called "ZODB 
Cache Invalidation".  This bug prevents a Transaction.begin() from 
refreshing the Connection cache of object from being reset to the latest 
from the DB.  When this bug is fixed somehow, I will then have time to 
release the code for the ZODB-omniORB connection.

John Heintz

Spicklemire, Jerry wrote:

> Helge wonders:
> 
> 
>> does anybody know of any attempt/project which tries to use ZODB as a
>> general OODBMS server, where the client is not tied to Python ?
> 
> 
> You might look at Andrew Kuchling's ZODB project:
> 
>  http://sourceforge.net/projects/zodb/
> 
> and consider adding connectivity using some of the language / platform
> independant goodies, such as:
> 
>  http://www.fnorb.com/
> 
>  ftp://ftp.parc.xerox.com/pub/ilu/ilu.html
> 
>  http://www.uk.research.att.com/omniORB/omniORBpy/
> 
>  http://theopenlab.uml.edu/pyorbit/ 
> 
> Good Luck!
> Jerry S.
> 
> _______________________________________________
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> 
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> 
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John D. Heintz | Senior Engineer

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