[Zope] storing persisten object in python dictionaries
Juergen.Herrmann at XLhost.de
Thu Oct 26 09:05:55 EDT 2006
On Thu, October 26, 2006 15:00, Marco Bizzarri wrote:
> On 10/26/06, Jürgen Herrmann <Juergen.Herrmann at xlhost.de> wrote:
>> On Thu, October 26, 2006 14:53, Marco Bizzarri wrote:
>> > Storing persistent object in object outside of ZODB can incur in the
>> > problem of passing object(s) between threads, and, therefore, passing
>> > one object which is related to a connection on the ZODB to another
>> > context with a different connection.
>> ok, this is probably the problem here, so would haveing a cache dict
>> for each thread help? there are only about 50-100 containers so the
>> memory overhead would be neglible compared to the performance gained.
> Yes, this should probably resolve your issue.
>> > Also, AFAIK, keep in mind _v_ attributes are not involved in
>> > transaction machinery of Zope. This means that if you have an error
>> > inside you transaction after you modified the _v_ cache, you will have
>> > the cache modified even tough the transaction has been aborted.
>> not a real problem as class instance containers are very static.
> I understand, we hit this problem while caching object obtained from
> database rows... and in case of failure cache became unreliable.
> I'm keeping the answer on the ML, if you don't mid.
of course, my failure while responding.
> Marco Bizzarri
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