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

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