[Sugar-devel] feedback from a teacher in Uruguay
Benjamin M. Schwartz
bmschwar at fas.harvard.edu
Fri Aug 14 13:33:03 EDT 2009
Andrés Nacelle wrote:
> We've got good results with the ejabber, but we don't know what
> will happen in a big school where 200 or 300 XO may appear n the
> Neighbourhood view.
Two solutions have been developed for this problem. Both work by making
sure that each user does not see all 300 other users.
1. Collabora's Gadget. Gadget is a Jabber extension that can be run with
ejabberd. It modifies the visibility/roster behaviors so that each user
only sees a restricted number of other users. Who sees who can be
configured programmatically, or even made to be random.
2. Moodle's ejabberd integration. Martin Langhoff developed a system to
connect Moodle's concept of classes to ejabberd. The result is that each
user only sees other users in his/her class, as configured through the
Moodle web interface.
I'll propose a third option, while we're talking about it:
3. Per-class servers. You can run many different ejabberd instances,
with DNS names like year4classD.schoolserver.local, one for each
classroom. Users can connect to the one for their classroom. Even if all
the ejabberds are running on the same physical server, this would prevent
overload. Once the servers are set up, no further server-side
configuration is required, and users can choose which class they are in.
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