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Re: Why the Web?

From: Brian E Carpenter <brian@hursley.ibm.com>
Date: Fri, 14 Dec 2001 18:18:19 +0100
Message-Id: <3C1A345B.8BAFB144@hursley.ibm.com>
To: Mark Baker <distobj@acm.org>
Cc: Keith Moore <moore@cs.utk.edu>, janssen@parc.xerox.com, discuss@apps.ietf.org

I worked in process control systems for ten years or so, and
my answer is: no, mechanisms such as you describe aren't
good enough. You need transactional reliability.


Mark Baker wrote:
> > I can't see any basic reason why a thermostat should be accessed as if
> > it was a hypertext document.
> I would do it for the same reason that anything ends up on the Web;
> - I can manipulate it from the same app I use to manipulate so much of
> my life already; the browser
> - it can leverage existing and yet-to-be-developed extensions such as
> WebDAV so that access to it can be locked, versioned, etc..
> - if I forget its URL, Google can find it for me
> - if my house network is unreliable, an existing cache on the network
> can let me know what the last cached state of my thermostat is, and
> when that state snapshot was taken
> - authentication for free
> - content negotiation permits my french-speaking serviceman to
> also manipulate and debug it remotely through the same URL
> etc..
> If that isn't reason enough for you, then do it just to prevent the
> APPS area from needing 10 area directors by the end of the decade. 8-)
> > I would expect building-services control
> > messages to get layered directly over a transport protocol in due
> > course. I certainly want thermostats to be accessed by a highly reliable
> > mechanism that survives disconnected operation, which is where this
> > thread started.
> You didn't think my explanation of reliability in the context of
> thermostat control was sufficient?  Can you elaborate on what else
> you'd think would be needed?
> MB
> --
> Mark Baker, Chief Science Officer, Planetfred, Inc.
> Ottawa, Ontario, CANADA.      mbaker@planetfred.com
> http://www.markbaker.ca   http://www.planetfred.com
Received on Friday, 14 December 2001 12:18:59 UTC

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