Last seen information in Tigase

Question

Tigase shows last seen information which indicates that when this person was last seen by the server. If it is not set than server set it to

    protected static final long INITIAL_LAST_SEEN_VAL = 1000l;

Can anyone please let me know how tigase server keep tracks of this last seen information.
thanks

Answer 1

Tigase sets lastSeen field in roster element to current time each time it receives a presence notification from this contact. Line 1328 in file: tigase.xmpp.impl.Presence:

if ((rel != null) && (rel instanceof RosterElement)) {
  ((RosterElement) rel).setLastSeen(System.currentTimeMillis());
}