[ZODB-Dev] ConflictErrors won't clear

[Jeremy Hylton]

On 4/15/05, Chris Withers <chris at simplistix.co.uk> wrote:
> > Short course:  A ZEO client needs to run an asyncore mainloop if it wants to
> > get invalidations processed "by magic".  Alternatives include calling
> > sync(), or closing and (re)opening the connection, at appropriate times.
> 
> Hurm, this really should be in bright flashing neon somewhere. I the 5
> years this process has been used, I've never known that ZEO don't work
> right when there's no asyncore loop :-(

It's mentioned in the documentation -- see section 3.4 ZEO programming
notes -- and it's been discussed on this list many, many times.

It sounds like the simplest approach for your application is to do
like Zope and start a separate thread that runs an asyncore mainloop. 
Then your application threads will see updates when the commit and
abort transactions, just like the would in Zope.

Jeremy