public static void unsubscribedToPresence(JID unsubscriberJID, JID recipientJID) {
        if (!listeners.isEmpty()) {
            for (PresenceEventListener listener : listeners) {
                try {
                    listener.unsubscribedToPresence(unsubscriberJID, recipientJID); 
                } catch (Exception e) {
                    Log.warn("An exception occurred while dispatching a 'unsubscribedToPresence' event!", e);
                }
            }
        }
    }
Notification message indicating that a user has unsubscribed
to the presence of another user.

@param unsubscriberJID the user that initiated the unsubscribe request.
@param recipientJID    the recipient user of the unsubscribe request.
xmppserver/src/main/java/org/jivesoftware/openfire/user/PresenceEventDispatcher.java