public void process(Packet xmppPacket) throws UnauthorizedException, PacketException {

        Presence presence = (Presence)xmppPacket;

        try {

            ClientSession session = sessionManager.getSession(presence.getFrom());

            Presence.Type type = presence.getType();

            // Available

            if (type == null) {

                if (session != null && session.getStatus() == Session.STATUS_CLOSED) {

                    Log.warn("Rejected available presence: " + presence + " - " + session);

                    return;

                }

                broadcastUpdate(presence.createCopy());

                if (session != null) {

                    session.setPresence(presence);

                    if (!session.isInitialized()) {

                        initSession(session);

                        session.setInitialized(true);

                    }

                }

                // Notify the presence manager that the user is now available. The manager may

                // remove the last presence status sent by the user when he went offline.

                presenceManager.userAvailable(presence);

            }

            else if (Presence.Type.unavailable == type) {

                broadcastUpdate(presence.createCopy());

                broadcastUnavailableForDirectedPresences(presence);

                if (session == null) {

                    // Recovery logic. Check if a session can be found in the routing table.

                    session = (ClientSession) XMPPServer.getInstance().getRoutingTable()

                            .getRoute(presence.getFrom());

                }

                if (session != null) {

                    session.setPresence(presence);

                }

                // Notify the presence manager that the user is now unavailable. The manager may

                // save the last presence status sent by the user and keep track when the user

                // went offline.

                presenceManager.userUnavailable(presence);

            }

            else {

                presence = presence.createCopy();

                if (session != null) {

                    presence.setFrom(new JID(null, session.getServerName(), null));

                    presence.setTo(session.getAddress());

                }

                else {

                    JID sender = presence.getFrom();

                    presence.setFrom(presence.getTo());

                    presence.setTo(sender);

                }

                presence.setError(PacketError.Condition.bad_request);

                deliverer.deliver(presence);

            }



        }

        catch (Exception e) {

            Log.error(LocaleUtils.getLocalizedString("admin.error") + ". Triggered by packet: " +

                    xmppPacket, e);

        }

    }