Greetings Fredik,
It is not entirely impossible. There are few papers on this subject
under the heading Delta-Grid by Susan Urban. The general idea is that
the "undo" manager has take in consideration all applications
(processes) that write to it. On writing, a change record derived
from the database's log stream is used to establish a set transaction
list that constitutes the undo stack.
The trouble for most WO apps is that such an undo inherently means
changing state for other connected clients that have data check out
from clean to dirty, which they will only discover on submission.
I hope that helps a little bit.
Later,
Dan Beatty
Ph.D. Student
Texas Tech University
On Mar 30, 2009, at 10:03 AM, Fredrik Lindgren wrote:
OK! Seems like I should keep away then!
Regards
/Fredrik
30 mar 2009 kl. 16.54 skrev Anjo Krank:
Am 30.03.2009 um 16:27 schrieb Mike Schrag:
That said, I'm not sure undo conceptually really works out in
EOF, anyway
You sure about that? Or is it just unreliable?
It _works_ -- that was maybe a bit too bold .. However, when you
stop using session.default, and start using lots of peers that are
very transient, I believe that ends up not really working out
practically. Doesn't each EC have its own undo manager on it, so
you would only be able to undo the transactions from a single EC
and it wouldn't be aware of its peers' transactions?
From what I understood, this was mainly for undoing changes from an
ECs POV, so deletes would get re-inserted etc. As far as this makes
sense... e.g. your didInsert() code would get called again wreaking
whatever havoc you'd expect after such a move.
Cheers, Anjo
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