[JDEV] Two more avatar issues.

Jens Alfke jens at mooseyard.com
Fri Sep 7 12:10:51 CDT 2001


On Thursday, September 6, 2001, at 04:31 PM, David Waite wrote:

> On a different note,  what is the benefit of being able to define an 
> avatar for different resources? It seems like what a user wants is to 
> see the same picture for the same person everytime.

Just thought of another, more technical, reason for per-resource avatars.

If the avatar image is _not_ per-resource, then every connected resource 
needs to know immediately when another resource changes the image. 
Otherwise the next time it sent a <presence> element it would send out a 
stale hash for the old image.

However, this kind of notification won't happen by default since you 
don't receive <presence> elements from your own resources (right?). I 
guess you could make it happen by adding yourself to your own roster, 
but that seems kind of awkward. And there's still a potential for race 
conditions if two resources try to simultaneously change the image.

It's the same fundamental thing I said in the other email: Avatar push 
is done as part of presence; presence is per-resource; therefore avatars 
should be per-resource.

—Jens
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