[Zope] Zope caching method results??

[John Toews]

The page is changing... But the results I'm looking at aren't.

The page outputs a list of lists. The number of items in the list is
based on a ZipFile object (actually a custom object that inherits from
that). So the number of items in the list, as well as the data, changes
- except for this one field.

I'd happily provide code for anyone interested in helping out...

Thanks,
John Toews 

-----Original Message-----
From: Dieter Maurer [mailto:dieter at handshake.de] 
Sent: Tuesday, August 12, 2003 2:32 PM
To: John Toews
Cc: zope at zope.org
Subject: Re: [Zope] Zope caching method results??


John Toews wrote at 2003-8-11 16:22 -0500:
 > I have an external method that is using a class I've written. The
class  > uses another module (dbxml for the Berkeley XML database).  > 
 > It _appears_ as if Zope is caching function results from the dbxml  >
module. The data doesn't change, but the memory address does.  > 
 > tmpXmlResults = self._manifest.queryWithXPath(resourceXpath,
 > self._manifestcontext)
 > 
 > The code runs perfectly if run outside of Zope simply on the command
> line.  > 
 > Is there any sort of caching that Zope does of non-product Python  >
objects? Or function results? Etc.?

I am quite convinced that Zope does not automatically cache the result
of External Method calls.

However, I remember to have read a similar complaint to yours in the
mailing list. Thus, they may be a low probability of a bug.

Much more likely is that there is some HTTP cache that caches your page
and does not consult Zope at all. Such problems are easily uncovered
when you request your browser to load the page without using any caches.


Dieter