class.ilOnlineTracking.php

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<?php
/*
        +-----------------------------------------------------------------------------+
        | ILIAS open source                                                           |
        +-----------------------------------------------------------------------------+
        | Copyright (c) 1998-2001 ILIAS open source, University of Cologne            |
        |                                                                             |
        | This program is free software; you can redistribute it and/or               |
        | modify it under the terms of the GNU General Public License                 |
        | as published by the Free Software Foundation; either version 2              |
        | of the License, or (at your option) any later version.                      |
        |                                                                             |
        | This program is distributed in the hope that it will be useful,             |
        | but WITHOUT ANY WARRANTY; without even the implied warranty of              |
        | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               |
        | GNU General Public License for more details.                                |
        |                                                                             |
        | You should have received a copy of the GNU General Public License           |
        | along with this program; if not, write to the Free Software                 |
        | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. |
        +-----------------------------------------------------------------------------+
*/

class ilOnlineTracking
{
        // Static
        function _getOnlineTime($a_user_id)
        {
                global $ilDB;

                $query = "SELECT * FROM ut_online WHERE usr_id = '".$a_user_id."'";
                $res = $ilDB->query($query);
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        $access_time = $row->access_time;
                        $online_time = $row->online_time;
                }
                return (int) $online_time;
        }

                

        function _addUser($a_user_id)
        {
                global $ilDB;

                $query = "SELECT * FROM ut_online WHERE usr_id = '".$a_user_id."'";
                $res = $ilDB->query($query);
                
                if($res->numRows())
                {
                        return false;
                }
                $query = "INSERT INTO ut_online SET usr_id = '".$a_user_id."', access_time = '".time()."'";
                $ilDB->query($query);

                return true;
        }

        function _updateAccess($a_usr_id)
        {
                global $ilDB,$ilias;

                $query = "SELECT * FROM ut_online WHERE usr_id = '".$a_usr_id."'";
                $res = $ilDB->query($query);

                if(!$res->numRows())
                {
                        return false;
                }
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        $access_time = $row->access_time;
                        $online_time = $row->online_time;
                }
                
                $time_span = (int) $ilias->getSetting("tracking_time_span",300);

                if(($diff = time() - $access_time) <= $time_span)
                {
                        $query = "UPDATE ut_online SET online_time = online_time + '".$diff."', access_time = '".time().
                                "' WHERE usr_id = '".$a_usr_id."'";
                        $ilDB->query($query);
                }
                else
                {
                        $query = "UPDATE ut_online SET access_time = '".time().
                                "' WHERE usr_id = '".$a_usr_id."'";
                        $ilDB->query($query);
                }
                return true;
        }
}
?>