Re: [wsrf] Scheduled termination, heartbeats and dependent object s

While heartbeating is important, watch that you don't break some of the
things that drive SOAP as an interface.

I am involved in the oBIX group, striving to get a WS interface to building
control systems.  Building control systems are what is embedded in
everything from HVAC to access control to lighting systems in buildings.
They have a plethora of binary protocols; each and every one of them, of
course, does a lot of heartbeating.

I am working to get to oBIX because all thios heartbeating makes these
systems perform very badly when scaled up to large numbers of systems, with
the non-deterministic network that is the internet in the middle.  Litle
pauses and blurts, student file sharing, or even people bring wireless
routers from home and plugging them in to a jack in their labs all bring the
unreliability of the entiore internet onto one campus.  

This means that I am focused on the barriers to scaleability that drive web
systems.  I am moving to SOAP because I want interactions to be stateless
and connectionless.  I know that this will force the controls manufacturers
to change their systems to be less slaves, and more autonomous systems
orchestrated, rather than controlled from afar.

A siginificant problem with some early implimentations is that they still
require active heartbeating, still have all those assumptions that have
caused me problems for years.  In effect, I have merely traded tight binary
protocols for verbose XML messages, without breaking the underlying
architectual assumptions that cause me pain.

So I guess, at the end, I would caution against reliance on heartbeats, or
define their apropriate use carefully and closely, so we do not get all the
problems of current distributed systems with none of the terseness.

Tc



Toby Considine
University of North Carolina
OASIS oBIX TC



-----Original Message-----
From: Tom Maguire [mailto:] 
Sent: Wednesday, September 08, 2004 10:41 PM
To: David Hull
Cc: 
Subject: Re: [wsrf] Scheduled termination, heartbeats and dependent objects





inlined below


David Hull <> wrote on 09/08/2004 05:47:20 PM: