[Standards] Invisible Command and probes

Philipp Hancke fippo at goodadvice.pages.de
Wed Jun 30 18:35:23 UTC 2010


Justin Karneges wrote:
> On Wednesday 30 June 2010 10:40:38 Matthew Wild wrote:
>> This is the problem. It has frequently been raised that the probes
>> sent by the user's server can be detected by a contact's server (think
>> plugins for easily-extensible XMPP servers...) to signal that the user
>> is invisible.
> 
> Have an XMPP server that probes contacts the first time it knows about them, 
> and on bootup, but never for any other reason.  Local user logins would never 
> trigger probes.  All incoming presence is cached indefinitely.
> 
> Advantages:
>   Optimized login times (instant presence for remote contacts, no waiting).
>   No giving away your availability due to causing probes when you log in.
> 
> Disadvantages:
>   Use lots of memory to cache presence.
> 
> On my 10-person server the advantages would outweigh the disadvantages.

Did you ever implement that? Imo it does not work (i.e. the cache is not 
reliable due to lost presence stanzas), but I would like to hear a 
second opinion.

philipp



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