[ZODB-Dev] ZEO for GUI applications
robert at gravina.com
Sat Mar 31 11:31:20 EDT 2007
On Mar 31, 2007, at 11:41 PM, Robert Gravina wrote:
> On Mar 31, 2007, at 11:13 PM, Robert Gravina wrote:
>> On Mar 31, 2007, at 10:32 PM, Stephan Richter wrote:
>>> On Thursday 29 March 2007 15:14, Robert Gravina wrote:
>>>> Is anyone using ZEO to build mutliuser networked applications
>>>> of Zope?
>>> Uwe Oestermeier and his team built Bebop. While the server
>>> component uses Zope
>>> 3, it uses a full wxPython GUI as client.
>> Wow, that looks very impressive. I'll checkout the source and have
>> a look around to see what I can learn.
> I'm still a little bit unsure about how to update the GUI when
> objects are changed.
> I noticed a previous thread on a similar topic which suggested to
> customise ZODB.DB.invalidate.
> I thought I could check the type of object, and generally that will
> be enough for me to decide which parts of the UI need a refresh. It
> seems though, that when I change data from one client other
> clients, although getting invalidate messages, are still displaying
> old data.
> I tried subclassing DB, and printing out the object as a test, but
> it's always "None" (even when I have a few clients connected). The
> code there to get the object from the cache I don't quite
> understand, I just copied it from ZODB.DB.invalidate and hoped for
> the best :)
> class UpdatedDB(DB):
> def invalidate(self, tid, oids, connection=None, version=''):
> DB.invalidate(self, tid, oids, connection, version)
> for oid in oids.keys():
> h = hash(oid) % 131
> o = self._miv_cache.get(h, None)
> print o
> Is there anything else I need to do/doing wrong?
Woohoo! I realised Connection.sync() does exactly what I need, but
this still doesn't work as expected.
def invalidate(self, tid, oids, connection=None, version=''):
DB.invalidate(self, tid, oids, connection, version)
if connection is not None:
Am I going about this the right way?
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