W3C home > Mailing lists > Public > www-ws-arch@w3.org > April 2002

Re: Infinite Loops and webservices

From: Heather Kreger <kreger@us.ibm.com>
Date: Fri, 19 Apr 2002 09:26:34 -0400
To: www-ws-arch@w3.org
Message-ID: <OF36AD6F6F.F14F7432-ON85256BA0.0049AD92@raleigh.ibm.com>
Well stated David, I agree completely.

Heather Kreger
Web Services Lead Architect
STSM, SWG Emerging Technology
919-543-3211 (t/l 441)  cell:919-496-9572

David Booth <dbooth@w3.org>@w3.org on 04/18/2002 04:45:21 PM

Please respond to "David Booth" <dbooth@w3.org>

Sent by:    www-ws-arch-request@w3.org

To:    www-ws-arch@w3.org
Subject:    Re: Infinite Loops and webservices

Whenever ANYTHING is automated, the automation can amplify the damage
caused by an error.  In this case, the problem can only occur if one of the
companies is willing to AUTOMATICALLY sell widgets (effectively) below
cost.  (If the retail sale price is equal to the wholesale purchase price,
then the sale is still effectively below cost because of overhead.)  It
would be stupid for any company to automatically do this without having
some kind of mechanism for limiting the volume.  Whenever a store offers a
"loss leader" (e.g. "bananas 2 cents a pound") it always limits the
quantity ("limit one per customer").

In short, this kind of mistake can be made, but it is not fundamentally
different from many other mistakes that you can make whenever you automate

At 12:56 PM 4/16/2002 -0400, Fraser David wrote:
>I have an idiot question:
>Given how loosely coupled webservices and their clients can be and the
>high degree of dynamicity(?) there can be in choosing webservices could it
>be possible that infinite loops could occur between companies?
>Company X manufactures widgits
>Company Y manufactures widgits
>Company Z is a retailer of widgits
>Company Z runs out of widgits and through dynamically searching through a
>UDDI registry determines that Company X has the best price for widgets.
>Company X does not have enough widgets to immediately fulfill the order
>but instead informing the client of this Company X's webservice has been
>programmed to search for another widget manufacturer (Company Y) in the
>UDDI registry and buy the widgets at
>cost thereby keeping the business of Company Z. Company Y only has 1
>widget left. Unfortunately its webservice has been programmed to search
>for the cheapest widget manufacturer in the UDDI registry if it does not
>have enough widgets to complete a sale. As Company X has the
>cheapest widgets it invokes it's webservice. This completes the loop and
>Company X and Y end up ordering 6 bazillion widgets from each other to
>fulfill Company Z's need for only a couple of widgets.
>Join the world's largest e-mail service with MSN Hotmail.

David Booth
W3C Fellow / Hewlett-Packard
Telephone: +1.617.253.1273
Received on Friday, 19 April 2002 09:27:35 UTC

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