Rajeev J Sebastian wrote: ...
What I also need, is a way to know which objects have changed, without having to maintain copies: the reason is to show those changes to the user in my (long-running) PyQt window.
As I mentioned before, ZODB doesn't provide a mechanism for this. I would like it to for just your sort of application.
Working out the right mechanism (if there is "a" right mechanism) would take some exerimenttation. Here are some ideas to try:
- For objects that want to know when they have changed, override _p_invalidate. This is called when an object has been modified in another thread (or process). Your version of _p_invalidate could update your application. Note however that it would need to make sure that the object's existing state was tossed, for example by calling Persistent._p_invalidate.
- If you can use zope.event (from Zope 3), modify ZODB.DB.DB.invalidate to generate an event when objects are invalidated and modify your application to subscribe to the events.
If you decode to these experiments, let us know how they turn out.
Jim
-- Jim Fulton mailto:[EMAIL PROTECTED] Python Powered! CTO (540) 361-1714 http://www.python.org Zope Corporation http://www.zope.com http://www.zope.org _______________________________________________ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/
ZODB-Dev mailing list - ZODB-Dev@zope.org http://mail.zope.org/mailman/listinfo/zodb-dev
