[Zope] Can multiple processes access a ZODB3 file?

[Chris McDonough]

Sorry about this, mail server troubles.

> -----Original Message-----
> From: Chris McDonough [mailto:chrism@digicool.com]
> Sent: Saturday, July 29, 2000 1:12 AM
> To: 'ross@irisfinancial.com'; zope@zope.org
> Subject: RE: [Zope] Can multiple processes access a ZODB3 file?
> 
> 
> The ZODB is generally process-locked.  It's not possible, to my
> knowledge, to access it from different python processes 
> simultaneously.
> To solve this, I'd highly encourage you to use ZEO, despite 
> your desire
> not to use it.  There's very little to learn with ZEO, and its proven
> very stable over the last few months.  It works just like FileStorage,
> you just need to install it, edit a couple files, create a
> custom_zodb.py file in your software home and go.  (all hail jim
> fulton!!)
> 
> > -----Original Message-----
> > From: Ross Boylan [mailto:rboylan@mindspring.com]
> > Sent: Friday, July 28, 2000 8:55 PM
> > To: zope@zope.org
> > Subject: [Zope] Can multiple processes access a ZODB3 file?
> > 
> > 
> > If I have Zope running, using ZODB3 on Data.fs, can a separate 
> > process also use ZODB3 to access Data.fs?  I have my 
> suspicions, but 
> > I'm not sure.
> > 
> > I'm interested in this because I'm in the middle of a balloting 
> > period.  People email me their ballots.  I will need to check them 
> > for validity, send out confirmation or error messages, and 
> eventually 
> > tally the results.
> > 
> > I definitely want a persistent store, so ZODB seems good.  Also, I 
> > eventually would like this to be a Zope product, with 
> people able to 
> > access the results on the web (and, in the future, vote on 
> the web).  
> > But getting it Zoped may be too much work in the short run.
> > 
> > So, I'll have a Zope server running on my Debian system, 
> and another 
> > process will be going through the mail.  It would be more 
> > straightforwad if that other process worked directly with the 
> > database, rather than going through Zope via http or xml-rpc or 
> > something similar.  So I'm wondering if that's possible.  I can 
> > always take the indirect route if, as I suspect, that's necessary.
> >  
> > I'm cribbing from parts of the Poll product as appropriate.  The 
> > polling machinery is considerably more complex though: a restricted 
> > list of voters, various muckings around to get the info out of the 
> > email, and preference voting (1 for first choice, 2 for second, etc 
> > with an instant run off).
> > 
> > I know Zeo is more in the multi-process space, but I don't want to 
> > use it for this project because I don't have time to learn it; it's 
> > alpha; and it seems like overkill for my problem.
> > 
> > 
> > 
> > 
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