[Zope-CMF] Re: Re: [Plone-users] Date based snapshots

[Dylan Jay]

----- Original Message ----- 
From: "Toby Dickenson" <tdickenson at geminidataloggers.com>
To: "Dylan Jay" <me at dylanjay.com>; "Dylan Jay" <gmane at dylanjay.com>
Cc: <zope-cmf at zope.org>; <plone-users at lists.sourceforge.net>
Sent: Thursday, May 06, 2004 7:09 PM
Subject: Re: [Zope-CMF] Re: Re: [Plone-users] Date based snapshots


> On Thursday 06 May 2004 08:29, Dylan Jay wrote:
>
> > Sorry, I should be more verbose with my reasoning. I'm submitting a
tender
> > for an Australian government tender. Apprently all Aust. gov. sites have
> > certain requirements with regard to auditing and tracebility. One
> > requirement is to be able to view the complete state of all
documents/pages
> > at any date/time in the past. Another is to be able to view the
differences
> > on a document from how it was in a the past. Both of these seem possible
by
> > fiddling round with data.fs files. The requirements however are for a
nice
> > UI which doesn't look likely as it would mean digging into FileStorage
to
> > enable the dynamic mounting of a backup data.fs with the current data.fs
so
> > diffs can be viewed.
>
> Some standard Zope document types have a 'history' tab. Apart from the
terse
> UI (which you can replace) and the fact that it doesnt contain *all*
history
> once the storage has been packed, would that capability satisfy you?

> DirectoryStorage has the capability of storing extra history for specific
> classes, designed for exactly this purpose. If you are not tied to
> FileStorage check out http://dirstorage.sourceforge.net/keepclass.html

History by itself seems fine as long as the entire history is available. I'm
thinking of a situation where the costs of keeping every version of every
object available in a production environment are too high. In this case you
would want to be able to bring in the appropriate versions from secondary
storage and combine them in someway with the current versions so the
currently supported diffing in zope/plone will work. I'm not sure that
DirectoryStorage would require any less hacking to do this than FileStorage.
Correct me if I'm wrong.