[ZODB-Dev] Discrete synchronization with ZEO

[Arve Knudsen]

On Mon, 24 Apr 2006 22:17:17 +0300, Dieter Maurer <dieter at handshake.de>  
wrote:

> Arve Knudsen wrote at 2006-4-23 22:44 +0300:
>> I already use ZODB as a local persistency service for my Python
>> application, now I'm considering ZEO as a distributed data source. The
>> thing is I don't want to keep my local object cache synchronized at all
>> times with the remote database, my application should only synchronize  
>> in
>> a controlled operation and then work with the disconnected  
>> representation.
>
> I fear the ZODB is not made for this use case.
>
> Synchronization is in the form of invalidation messages
> deeply embedded into the ZODB.
> You may simply delay the invalidation messages and
> thereby delay synchronization. However, you will problably
> suffer from the lack of prefetching support and the need
> to synchronize any modification immediately with the ZODB.

Ok, thanks for clearing this up. I've given the problem some thought, and  
am presently considering a scheme where I cache the ZEO-served objects in  
a local ZODB in order to enable off-line work. How should I ensure local  
ownership of objects from the ClientStorage, by deep copying them?

Arve