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Re: "notification" pattern for web services

From: Steven Gollery <sgollery@cadrc.calpoly.edu>
Date: Thu, 24 Jan 2002 13:55:29 -0800
Message-ID: <007001c1a521$d69690a0$97ab3ecf@cadrc.calpoly.edu>
To: <www-ws@w3.org>

Thanks for the tip. I just took a look at the NotificationClient in the
wstk, and I have a couple of follow-up questions (I also left these
questions on the Alphaworks wstk discussion forum).

It looks like the NotificationClient is also a web service -- am I right
about that? Is it possible to be a subscriber without also being a web

Thanks again,


----- Original Message -----
From: "James M Snell" <jasnell@us.ibm.com>
To: "Steven Gollery" <sgollery@cadrc.calpoly.edu>
Sent: Thursday, January 24, 2002 10:23 AM
Subject: Re: "notification" pattern for web services

> The IBM Web Services Toolkit version 3.0 release has a sample prototype
> "Notification Service" that does simple pub/sub messaging.  It is,
> however, just a first step.  It is available at
> http://alphaworks.ibm.com/tech/webservicestoolkit
> - James M Snell/Fresno/IBM
>     Web services architecture and strategy
>     Internet Emerging Technologies, IBM
>     544.9035 TIE line
>     559.587.1233 Office
>     919.486.0077 Voice Mail
>     jasnell@us.ibm.com
>  Programming Web Services With SOAP, O'reilly & Associates, ISBN
> 0596000952
> ==
> Have I not commanded you?  Be strong and courageous.  Do not be terrified,
> do not be discouraged, for the Lord your God will be with you wherever you
> go.
> - Joshua 1:9
> Sent by:        www-ws-request@w3.org
> To:     www-ws@w3.org
> cc:
> Subject:        "notification" pattern for web services
> In several documents, I've seen references to providing web services
> that follow the notification (or publish/subscribe) pattern, but I've
> never seen any sample code. I can see a way to do it using socket
> connections for the notification, but obviously there are going to be
> many situations where this won't work.
> Does anyone know where I can find code implementing a publish/subscribe
> web service? The scenario I have in mind is: (1) the web service
> advertises that it can provide information about a given set of topics;
> (2) clients connect to the web service and subscribe to particular
> topics; (3) other clients publish information about some topic by
> sending that information to the web service; (4) the web service sends
> the information to all the clients that subscribe to that topic. This
> has to work regardless of whether the clients are behind a firewall, and
> it would also be nice if there was some way for browser-based clients to
> participate.
> If building a publish/subscribe system using just web services is
> impractical in the general case, I'd also be interested in other ideas
> that would play well in a system that is primarily based on web
> services.
> Thanks in advance,
> Steven Gollery
> sgollery@cadrc.calpoly.edu
Received on Thursday, 24 January 2002 16:53:59 UTC

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