[Zope] Persistence Problem

[Chris McDonough]

I forget the geneology of this thread, but what was wrong with
storing the data in a session?

----- Original Message -----
From: "Charlie Reiman" <creiman@kefta.com>
To: <kthangavelu@earthlink.net>; <zope@zope.org>
Sent: Friday, August 16, 2002 12:34 PM
Subject: RE: [Zope] Persistence Problem


> Thanks everyone. This dawned on me as I was on the train riding
home. I also
> found __setstate__ and __getstate__ if I want to mess with the
loading hooks
> (I don't).
>
> http://www.zopelabs.com/cookbook/1002251996
>
> The Zope Developer's guide does talk about module variables. But
all it says
> is:
>
> "Objects stored in modules but not in the ZODB are not persistent
and
> not-thread safe. In general it's not a good idea to store data (as
opposed
> to functions, and class definitions) in modules when using ZODB."
>
> This is not helpful, as there are times when this level of storage
is
> exactly what you want. This paragraph reads as a "Just don't do
this,"
> paragraph rather than a "You can do this, here's why you'd want to
and what
> pitfalls to avoid," paragraph. I've seen the same trick in
exUserFolder
> (although I did not understand why it did that until yesterday).
>
> Also, the dev guide makes no mention of _v_ attributes be
thread/connection
> specific, which is a dangerous oversight, IMHO.
>
> I've made the appropriate comments to the dev guide online. Thanks
for
> everyone's help.
>
> Charlie.
>
> > -----Original Message-----
> > From: kapil thangavelu [mailto:kthangavelu@earthlink.net]
> > Sent: Thursday, August 15, 2002 7:43 PM
> > To: Charlie Reiman; zope@zope.org
> > Subject: Re: [Zope] Persistence Problem
> >
> >
> > as andy mentioned, _v_  volatile attributes are specific to a
> > thread (well,
> > technically there specific to the underlying zodb connection).
> > they remain
> > only as long as the object remains in memory/cache.
> >
>
> .......
>
>
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