public static function invoke_move_action($action, $dir, $table, $field, $key, $index, $position) {
        global $CFG, $XMLDB, $SESSION;
        require_once($CFG->libdir.'/ddllib.php');
        require_once("$CFG->dirroot/$CFG->admin/tool/xmldb/actions/XMLDBAction.class.php");
        require_once("$CFG->dirroot/$CFG->admin/tool/xmldb/actions/XMLDBCheckAction.class.php");
        $params = self::validate_parameters(self::invoke_move_action_parameters(), [
            'action' => $action,
            'dir' => $dir,
            'table' => $table,
            'field' => $field,
            'key' => $key,
            'index' => $index,
            'position' => $position
        ]);

        self::validate_context(context_system::instance());
        require_capability('moodle/site:config', context_system::instance());

        if (!in_array($action, ['move_updown_table', 'move_updown_field', 'move_updown_key', 'move_updown_index'])) {
            throw new coding_exception('Unsupported action');
        }

        $action = $params['action'];
        $actionsroot = "$CFG->dirroot/$CFG->admin/tool/xmldb/actions";
        $actionclass = $action . '.class.php';
        $actionpath = "$actionsroot/$action/$actionclass";

        if (file_exists($actionpath) && is_readable($actionpath)) {
            require_once($actionpath);
        }
        if (!class_exists($action)) {
            throw new coding_exception('Action class not found');
        }

        if (!isset($SESSION->xmldb)) {
            $XMLDB = new stdClass;
        } else {
            $XMLDB = unserialize($SESSION->xmldb);
        }

        $_POST['dir'] = $params['dir'];
        $_POST['table'] = $params['table'];
        $_POST['field'] = $params['field'];
        $_POST['key'] = $params['key'];
        $_POST['index'] = $params['index'];
        $_POST['direction'] = ($params['position'] > 0) ? 'down' : 'up';
        for ($i = 0; $i < abs($params['position']); $i++) {
            $a = new $action();
            $a->invoke();
        }
        $SESSION->xmldb = serialize($XMLDB);
    }