Getting active sessions

hi, i’m wondering if anyone knows a simple way to grab all the active
session
objects in a system. i’m adding a messaging component to our app and i
want to
enable users who are online to see when they’ve been messaged –
messages are
associated with users, so basically what i want to do is go through the
sessions, find the one for a specific user, and reload it when they’ve
received
a message.

i’m using rails’ default filesystem-based sessions. i found this post
that
describes something similar, but it requires changing to db-stored
sessions,
which i’d rather not do:
http://habtm.com/articles/2005/12/15/whos-online

aren’t sessions held in memory somewhere? is there any simple way to
just get
them from memeory, rather than the filesystem or db?

john


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