[standards-jig] Pub/Sub Explanation

Peter Saint-Andre stpeter at jabber.org
Tue Apr 16 19:27:31 UTC 2002

Peter Millard and I were chatting over lunch, and he mentioned that the
initial motivation for developing pub/sub systems in Jabber were things
like this:

1. I publish my vCard
2. I publish my public key
3. I publish my avatar

These are things that you might want to subscribe to (i.e., know when they
change, which change is an event), and that we'd probably want to be


Peter Saint-Andre
email+jabber: stpeter at jabber.org
weblog: http://www.saint-andre.com/blog/

On Tue, 16 Apr 2002, DJ Adams wrote:

> On Tue, Apr 16, 2002 at 11:59:52AM -0500, Peter Saint-Andre wrote:
> >[...]
> > we have pure pull, pure push, or hybrid depends on what kind of data
> > is being published. Think of a simple pub/sub system for weblogs. I
> > could be notified when your blog changes and then I have to pull down
> > the URL for your latest story. I could be notified when your blog changes
> > but also receive an abstract of the story, thus helping me decide if I
> >[...] 
> > Well, those are just random thoughts, hopefully someone finds them of use.
> Sure!
> In fact, I've experimented with both scenarios (a payload-less) event
> type scenario (that's what we're doing with Radio right now), and a
> publish scenario with Peerkat, where the whole item is published.
> I don't think either of these two scenarios are in question in either
> case; I think it's more related to what mechanism is looking after any
> data that might be polled (in the Radio case, for example, it's a
> nation of an RCS (Radio Community Server), and the Radio desktop itself. 
> Cheers
> dj
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