YII - 对会话过期执行控制器操作

Question

I am trying to update one column in DB during user session timeout, I have been set the timeout in main.php,

'components' => array(  
    'session'=>array(

    'class'=>'CDbHttpSession',
    'timeout'=>10,
    )),

Now the application gets logout automatically after 10 seconds of inactivity, how can i perform some controller action on default Yii session time-out method (which class or method that performs default session expiry in Yii) ?