Christian Theune <[EMAIL PROTECTED]> wrote: > Am Freitag, den 01.06.2007, 09:47 +0200 schrieb Kai Diefenbach: > > A gets counter = 5 > > B gets counter (before A writes the increased counter) = 5 > > > > A increases and writes the counter => 6 > > B increases and writes the counter => 6 (*) > > > > *) In my understanding, here a ConflictError is raised and the whole > > transaction will be repeated, that means it starts with the counter of > > 6. Is this right? > > Yes, in Zope. That's nothing ZODB does. ZODB only raises a conflict > error and aborts the transaction.
Ah, thanks! > And you can make it perform better by implementing application level > conflict resolution so your counter knows that if two transactions moved > from 5 to 6 concurrently the real value should be 7. This is *the* > example for when application level conflict resolution is helpful. > > But: Your ALC code must be available on the ZEO server if needed. Okay, sounds interesting. I check this out. Thanks! Kai -- Kai Diefenbach - http://diefenba.ch iqplusplus - http://iqpp.de _______________________________________________ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org http://mail.zope.org/mailman/listinfo/zodb-dev