Re: Zeo and two processes changing the zodb - not getting the up to date version of the object

Julien, can you explain the difference? I need to read in the properties of 
an object and it needs to be the latest values for those properties. The 
properties have been updated by another process and then indexing that 
object is deferred and handled by a third process. All of these processes 
use zeo.

On Thursday, 2 February 2017 10:58:41 UTC, Julien Muchembled wrote:
>
> Le 02/02/17 à 11:53, Jo Gilder a écrit : 
> > Thanks, I haven't used monkey patches before. 
> > 
> > I have now wrapped my readonly code in an explicit transaction and using 
> readCurrent seems to be doing the job. More testing needed though. 
>
> Maybe I didn't understand your issue but readCurrent has a different 
> purpose than all other suggested solutions (which actually all do the same 
> thing): 
> - ZEO 5 with server-sync true 
> - ping the server explictely before transaction.begin() (which may be 
> annoying to maintain in your code) 
> - use our monkey-patch 
>
> Julien 
>
> > On Thursday, 2 February 2017 09:50:34 UTC, Julien Muchembled wrote: 
> > 
> >     Le 02/02/17 à 10:26, Jo Gilder a écrit : 
> >     > Hi, do you have an example of this in use? I can't see where it is 
> used in your code base. 
> > 
> >     It's a monkey-patch. Once this module is loaded, we know that we 
> have a up-to-date view of the DB when we start a transaction. 
> > 
> >     Here is a place where it's important for us to have such behaviour: 
> >       
> https://lab.nexedi.com/nexedi/erp5/blob/f6d96c460323a5b7094feff2fbbf545deb9195db/product/CMFActivity/Activity/SQLBase.py#L497 
> <
> https://lab.nexedi.com/nexedi/erp5/blob/f6d96c460323a5b7094feff2fbbf545deb9195db/product/CMFActivity/Activity/SQLBase.py#L497> 
>
> > 
> >     To check this, we also have a unit test at 
> >       
> https://lab.nexedi.com/nexedi/erp5/blob/f6d96c460323a5b7094feff2fbbf545deb9195db/product/ERP5/tests/testInvalidationBug.py#L93 
> <
> https://lab.nexedi.com/nexedi/erp5/blob/f6d96c460323a5b7094feff2fbbf545deb9195db/product/ERP5/tests/testInvalidationBug.py#L93> 
>
> > 
> >     Julien 
> > 
> >     > On Wednesday, 1 February 2017 18:05:11 UTC, Julien Muchembled 
> wrote: 
> >     > 
> >     >     Le 02/01/17 à 18:37, Jo Gilder a écrit : 
> >     >     > I'm running zeo 4. Is there any way to do this without 
> upgrading? We are a week away from a release and upgrading zeo means 
> upgrading lots of other packages too. 
> >     >     > 
> >     >     You can use our monkey-patch on 
> >     >       Connection.ping 
> >     >     and 
> >     >       Connection.newTransaction 
> >     > 
> >     >     
> https://lab.nexedi.com/nexedi/erp5/blob/master/product/ERP5Type/patches/ZODBConnection.py 
> <
> https://lab.nexedi.com/nexedi/erp5/blob/master/product/ERP5Type/patches/ZODBConnection.py> 
> <
> https://lab.nexedi.com/nexedi/erp5/blob/master/product/ERP5Type/patches/ZODBConnection.py 
> <
> https://lab.nexedi.com/nexedi/erp5/blob/master/product/ERP5Type/patches/ZODBConnection.py>> 
>
> >     > 
> >     >     Julien 
> >     > 
> > 
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