online_users = app_globals.memcache_client.get('online_users_cache')
        if online_users is None:
            online_users = {
                           'logged':{},
                           'unlogged':{}
                           }

        if request.user:
            online_users['logged'][request.user.id] = datetime.datetime.now()
        else:
            online_users['unlogged'][ip] = datetime.datetime.now()

        new_online_users = {
                           'logged':{},
                           'unlogged':{}
                           }

        online_logged_users = online_users['logged'].items()
        for user in online_logged_users:
            entry = online_logged_users.pop(0)
            delta = datetime.datetime.now() - entry[1]
            if delta.seconds < 600:
                new_online_users['logged'][entry[0]] = entry[1]

        online_logged_users = online_users['unlogged'].items()
        for user in online_logged_users:
            entry = online_logged_users.pop(0)
            delta = datetime.datetime.now() - entry[1]
            if delta.seconds < 600:
                new_online_users['unlogged'][entry[0]] = entry[1]


        app_globals.memcache_client.set('online_users_cache', new_online_users)