Squat progress, 26 March 2003

Craig Latta craig.latta at netjam.org
Thu Mar 27 00:22:23 UTC 2003


	(Squat mailing list details at http://netjam.org/squat )

Hi--

	In my last update, I mentioned that I had installed a minimal version
of Flow into a small (600k) snapshot. I am now communicating with that
snapshot from a normal one, via sockets. I have also implemented a
minimal remote message-sending facility (AKA an "ORB"), so that I can
send messages from the normal system to the small one via proxies, with
complete transparency. (I didn't use one of the extant ORBs for various
technical reasons, see postscript below.)

	I'm using the remote-sending facility to direct the further shrinking
of the small snapshot from the normal one. This way, it's very
straightforward to shut down the human interface, for example. I'll
probably do some final cleanup with the simulator (I've added support
for making snapshots, along with a few other utilities; among other
things, I've made a small snapshot with the GUI ripped out via
simulation). I also plan to use remote-sending to build up snapshots
from the minimal one.


	thanks,

-C

p.s.

	None of the Squeak ORBs I looked at (Diego Gomez Deck's rST, Xu Wang's
S2S, John Fabry's RMP, Peter Smet's FlyByWire, Masashi Umezawa's
SOAPOpera, Lex Spoon's RemoteObject framework) were quite the right
thing for what I'm doing. Generally, they didn't provide complete
forwarding coverage. What I've done forwards absolutely everything, even
messages normally handled by the virtual machine, or resolved in the
method cache (the proxy class I've made won't even compile messages sent
to self in instance methods :). I don't use >>doesNotUnderstand: (in
fact, that would get forwarded :), and the proxy class can be inserted
anywhere in the class hierarchy. It's also decently fast, and simple.

--
Craig Latta
http://netjam.org/resume
craig at netjam.org



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