Jecel Mattos de Assumpcao Jr.
jecel at lsi.usp.br
Wed Nov 1 03:04:50 UTC 1995
Sorry if there is line noise - my connection is getting worse
Tue, 31 Oct 1995 09:08:38 +0800, Randall.Smith at Eng.Sun.COM (Randy Smith) wrote:
> > [ my HotSelf idea ]
> Dave and I sat down and added this in about 15 minutes! Press a
> button and end up with some new self object in your hand.
That's great!! Does this mean I get two more wishes ;-) ?
I assume this happens when the broswer find a line like
<a href=xxx.self>click me </a>, right? How about having
<app=xxx.self> show the resulting object inside the page?
Better yet - make <img src=xxx.gif app=xxx.self> show the
object in the page, and an image of the object in a dumb
> > [ I claimed undo needed VM support ]
> Would like to hear your ideas on this one in particular. What are you
> thinking? A redo of the assignment primitive to keep a reference to the
> last N old values ??
That would be a bit better than using something like "rawColor" slots
to save old versions, but would not be too efficient - versions, like
wrappers, tend to spread and contaminate the whole system.
Actually, I am not sure what should be done, but I feel it must be
integrated with the garbage collector and the persistent store
system. The best idea I have seen so far is Paul Wilson's "Deamonic
Memory", but he seems to have gone in other directions now. I can
try to get a reference, if there is interest. Anyway, his system
would let you back up the whole system to any point in the past.
That is not what I want. I want to be able to back up a certain set
of objects to any point in the past (and even have some of them
coexist with their current versions!).
Of course there must be a high-level "hook" to all this so the user
can control this from the user interface, but I don't think a good
solution can be made only at the programming environment level (though
a cumbersome one could - a kind of copy-down in time :-)
This is *the* major missing piece for Merlin. If I can't solve this,
then the system will be too dangerous for normal use (at least
Self 4.0 has snapshots...)
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