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Re: Book chapter on Synch/Asynch

From: Sai Surya Kiran Evani <evani@informatik.uni-freiburg.de>
Date: Mon, 25 Aug 2003 10:41:19 +0200
Message-ID: <3F49CBAF.8070106@informatik.uni-freiburg.de>
To: doug@rds.com
Cc: www-ws-arch@w3.org


Would calling the message exchanges ordered/unordered instead of 
sync/async be more clear?


Doug Kaye wrote:

>Hello, Hao & Roger.
>I'm the author of the chapter/book in question. To the extent that I've read
>and understand your arguments (I read the two messages you referenced
>below), I agree with the definition. OTOH, I didn't find another explanation
>of the "conundrum" so there may be issues I'm not considering.
>To my mind the distinction between synch and asynch comes down to the
>opportunities for implementation. Specifically, a synch implementation can
>(but not must) be non-event driven. It can be designed using a single-task
>send-wait-receive model. Not that this is recommended, but it's at least
>possible. Asynchronous processing implies an event-driven model in which the
>next-to-arrive message is not deterministic. This assumes no errors *at the
>layer under consideration*. As was pointed out, asynch or synch at one level
>may be based on a different MEP at the lower layer(s) and vice versa.
>     ...doug
>Doug Kaye, CEO
>RDS Strategies LLC
>doug@rds.com, www.rds.com
>v: 415.453.1400, f: 415.459.0103
>From: "He, Hao" <Hao.He@thomson.com.au>
>To: "'Champion, Mike'" <Mike.Champion@SoftwareAG-USA.com>,
>Date: Mon, 25 Aug 2003 08:32:31 +1000
>Subject: RE: Book chapter on Synch/Asynch
>Well, it appears to me that the author agrees with Geoff
>(http://lists.w3.org/Archives/Public/www-ws-arch/2003Aug/0060.html) and me
>(http://lists.w3.org/Archives/Public/www-ws-arch/2003Aug/0054.html).  That
>is:"if ordering is important, it is sync.  Otherwise, it is async.".
>-----Original Message-----
>From: Champion, Mike [mailto:Mike.Champion@SoftwareAG-USA.com]
>Sent: Wednesday, August 20, 2003 5:57 AM
>To: www-ws-arch@w3.org
>Subject: Book chapter on Synch/Asynch
>Those interested in the definition and architectural implications of
>"synchronous" and "asynchronous" web services might wish to look at
>This is a free chapter of LOOSELY COUPLED by Doug Kaye
Received on Monday, 25 August 2003 04:44:38 UTC

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