From: Austin Ziegler <austin@...>
Date: 2003-09-19T06:44:07+09:00
Subject: Re: madeleine + transaction::simple

On Fri, 19 Sep 2003 02:55:12 +0900, ahoward wrote:
> would i be the first to consider this?  has it been done?  any ideas on
> the fastest way - one could up with alot of marshaling...

I don't really know Madeleine, but I don't think that there'd be much 
conflict between the two frameworks. Transaction::Simple takes a snapshot of 
the object at a point in time and keeps it in memory. It doesn't concern 
itself with repeatability of a transaction (as Madeleine does), but it uses 
that snapshot to rebuild the object if rewound. It does not reuse the same 
object identifiers (unless the object responds to #replace), so anything 
that depends on #__id__ will break on a rewind or abort.

Transaction::Simple is used in PDF::Writer to make "test changes" to a PDF 
document; if something protected would cross a page boundary, we undo it, 
create the page boundary, and then restart the object. So it's really meant 
for "test changes", not for persistence.

Maybe Madeleine can use Transaction::Simple to gain the ability to rewind 
transactions.

-austin
--
austin ziegler    * austin@halostatue.ca * Toronto, ON, Canada
software designer * pragmatic programmer * 2003.09.18
                                         * 17.30.56