[ZODB-Dev] ZEO for GUI applications

[Robert Gravina]

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  
>>>> outside
>>>> of Zope?
>>>
>>> Uwe Oestermeier and his team built Bebop. While the server  
>>> component uses Zope
>>> 3, it uses a full wxPython GUI as client.
>>>
>>> http://svn.kmrc.de/
>>
>> Wow, that looks very impressive. I'll checkout the source and have  
>> a look around to see what I can learn.
>>
>> Thanks,
>>
>> Robert
>>
>
> 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.
> http://www.mail-archive.com/zodb-dev@zope.org/msg01969.html
>
> 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.

class UpdatedDB(DB):
     def invalidate(self, tid, oids, connection=None, version=''):
         DB.invalidate(self, tid, oids, connection, version)
         if connection is not None:
             connection.sync()

Am I going about this the right way?

Thanks,

Robert


> Robert
>
>
>
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