Hello Erik. As the author, I'll suggest that you move on to a ZODB connection pool used by the usual Twisted-provided thread pool. zc.twist is maybe interesting and maybe clever, but of very limited usefulness. I suspect it is only used in zc.async, and that's probably as it should be. It's a case of premature generalization.
If you are going to use Twisted in anything like a normal way, and the ZODB in anything like a normal way, use a connection pool and threads. Best, Gary On Jul 28, 2011, at 4:12 PM, Erik Allik wrote: > Hello everyone, > > I hope this is the right mailing list to post this question to. > > I'm trying to build an Twisted application that uses ZODB and I've > also found zc.twist. > I've read its README as well as the source code to try to understand > how exactly and why I should use zc.twist, and also asked the same > questions on irc.freenode.net #zope but without a conclusive answer. > > What I'm not able to understand is whether using zc.twist will allow > me to do all ZODB access in the main Twisted thread, or if still need > to set up a thread pool and deferToThread any code that accesses the > DB. > > The README of zc.twist has: > "Everything can be done within the main thread, so it can be full-bore > Twisted usage, without threads." > > However, looking at the source code of zc.twist, I cannot find any > reference to async communication (callbacks/polling) with ZODB, so > it's difficult to conclude that all DB access is non-blocking and can > be done in a single thread. Also, there are some examples with threads > in the README. > > I would highly appreciate if somebody with a clearer understanding of > this could explain to me whether I in fact need to set up a thread > pool, and in any case, what exactly is zc.twist for regardless of > whether it needs to be used with a threadpool or not. > > Thanks in advance! > > Regards, > Erik Allik > > P.S. I'd be very thankful for any references to open source > projects/code using ZODB with Twisted, or even zc.twist (besides > zc.async). > _______________________________________________ > For more information about ZODB, see the ZODB Wiki: > http://www.zope.org/Wikis/ZODB/ > > ZODB-Dev mailing list - ZODB-Dev@zope.org > https://mail.zope.org/mailman/listinfo/zodb-dev _______________________________________________ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org https://mail.zope.org/mailman/listinfo/zodb-dev
