sub regenerate_session_id {
        my $sess = shift;
        $sess->dataref->{_SESSION_ID} =
                $sess->_id_generator->generate_id(
                        $sess->{_DRIVER_ARGS},'');
        $sess->_set_status($sess->STATUS_MODIFIED);
        $sess->flush();
        
        return $sess->dataref->{_SESSION_ID};
}