[JDEV] Lots of Presence: Distributed access to presence data from a server farm

Wed Jul 2 23:05:13 CDT 2003

If you google around a bit, im sure you would find code for doing what 
you want. The component concept I personally have done, and it was 
<bcc/>ed on presence. I stored the presences in a DB and did DB access 
from the webserver to scarf up the presences. It was a hack, and I'm 
sure you could do better, but I think I still have my code around 
(perl) if you are interested in looking.
-- 

Nicholas Perez
Email: 	nick at jabberstudio.org
Jabber:	nickperez at jabber.org
Home:	303.759.0574


On 2003.07.02 17:25, Mike Prince wrote:
> I'd like a simple mechanism I can drop into my web page logic to
> determine the presence of anyone that's a member of the Jabber server
> I
> control.
> 
> For example, my JSP page would include:
> 
> <html>
> <body>
> The user romeo is <%=presenceTrackerBean.getPresence(
> "romeo at myjabber.com" ); %>
> </body>
> </html>
> 
> 
> Soooo... What's the best way to do this?  I like it to work with
> JabberD
> 1.4.2 but move over to JabberD 2.0 easily.
> 
> Some ideas:
> 
> 1) Write a Jabber component that queries the Jabber server for
> presence
> info in real time.  My guess is that this would be a bottleneck in web
> page generation.  Or am I wrong...
> 
> 2) Write a Jabber component that listens in on <presence> packets and
> keeps a cache in memory.  My JSP bean simply queries the in-memory
> cache.  On cache misses we report "not available" and then request an
> update in the background so our next report is a wee bit more
> accurate.
> It's OK to be a little bit wrong in my app
> 
> 3) Same as #2, except drop the presence data into a database.  This
> gives us a more scalable approach.
> 
> 4) Maybe patch the Jabber server to drop presence information directly
> into a database
> 
> 
> Thanks in advance,
> 
> Mike
> 
> 
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