The repeaters concept doesn't solve the privacy list interactions
either.
Why not? For each list of folks that a server wants to send presence
to, it creates a list. If that list has different people on it for
different reasons, it creates different lists. In the case of
presence, the server could, in the face of privacy lists being turned
on, create a presence-out list and a presence-probe list for the user
in question at each site where you have more than N users, where N
should be determined through some sort of analysis at where the
trade-off point is. I'm betting it's at least 10.
Yes, this could lead to **lots** of lists. We better a) get the
protocol right, b) make sure it's going to help, and c) implement it
carefully.
Exactly the point I was trying to make.
The following paragraph after that one qualified this a bit by
starting as "If multiple senders...".
I should have written "The repeaters concept doesn't solve the privacy
list interactions either, if you are using multiple senders for the
same list".
If you use multiple lists, one per user, the problem does not apply of
course.
Sure but the lists don't "have" to have multiple senders on them, its
just nice in the protocol to allow that capability if it is needed, but
notes probably need to be made in the spec on how it would work with
privacy lists, as Joe says you would have however many lists per user
the server needs defined in order to have the stanzas delivered
according to the applied privacy lists, might well get a bit complicated
and not actually gain you much if the privacy lists are being constantly
changed but then that's up to the server logic to detect and only bother
setting up repeaters where there is likely to be an actual real gain in
bandwidth usage.
As you say I don't think that many people are using privacy lists or
arn't likely to be defining complex sets of options and are likely to
just be using them for blocking, so in real world usage it shouldn't get
too complicated, but at least with repeaters you get the benefit of more
optimised distribution of the stanzas but also allow privacy lists to
still work.
Richard
