[Zope] Thread-Safety and ZODB Was: How/Where to store user specific data?

[Thomas Guettler]

On Tue, Aug 21, 2001 at 06:43:39PM -0400, Jim Penny wrote:
> On Wed, Aug 22, 2001 at 12:22:09AM +0200, Thomas Guettler wrote:
> > How (Where) can I store user specific data?
> > 
> > I am developing a product in python (Multible Choice Test) and want to
> > store some data for every user (Results of the tests).
> > 
> > I see two ways: 
> >  Add data to the user object in acl_users 
> 
> God, no.  Won't scale, depends on which acl_user is in use.
> 
> >   or
> >  Store data in a hash with the user-id as key
> 
> Won't survive threading.  You could use some sort of Session
> product, but if this needs to be permanent, that is also the wrong
> solution.

Why? According to the ZopeBook ZODB is thread-safe. But I don't know
how this thread-safety is implemented. How can I synchronise things
like this:

if(self.i<100): i=i+1

If self.i mustnot be bigger than 100 this could be a problem.

> This sounds like a job for a database.  

Up to now I was very impressed by ZODB. Would like to use it.



-- 
Open Source Software Solutions 
Thomas Guettler <thomas@thomas-guettler.de>
http://www.thomas-guettler.de