On Saturday 05 January 2002 08:15 pm, kapil thangavelu allegedly wrote: > On Sunday 30 December 2001 08:00 pm, Casey Duncan wrote: > > This behavior is logical if unintuitive. I propose > > that we can kill two birds with one stone to fix this: > > > > - Add a new method perhaps: getModificationTime() to > > the API of SimpleItem or even Persistent that returns > > the ZODB modification time or if the object has been > > changed, but not yet commited, the current date/time. > > > > - Deprecate bobobase_mod_time and perhaps even omit it > > entirely from Zope3. > > > > This will fix the aforementioned bug and get rid of an > > API anachronism. > > > > Thoughts? > > sounds good, i played around with an implementation to do the above. i'm > not posting it here causes its inefficient, although i'm happy to email it > to anyone who's interested. it basically added three methods. > [snip details] > > there are two inefficiencies one is memory because of DateTime for every > registered object and two is computational from the lack of a uniform > (across subclasses) hash function for persistent objects which results in > traversal of the registered object list to identify if an object is > registered or not (and to determine position to figure out the index into > registration_times). a much better solution memory wise would have the > transaction.py keep a DateTime for its initialization and then have > registered objects store registration times as deltas of that. i'm not sure > what the better solution is in terms of the computational issue. but as is > this solution doesn't seem scalable to me until the computational issues > can be handled.
For memory concerns, couldn't you just store the DateTime as a floating point number? This would incur just a small overhead to create a DateTime object when the value is looked up. I am interested in seeing this code. From my perspective it seems overly sophisticated. I'm interested how you derive the registration time in the first place. /---------------------------------------------------\ Casey Duncan, Sr. Web Developer National Legal Aid and Defender Association [EMAIL PROTECTED] \---------------------------------------------------/ _______________________________________________ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )