public function getAll()
    {
        if ($this->isRequestGet()) {
            try {
                $class = $this->getClassParameter();
                $classes = $this->getResourceService()->getAllClasses($class);
                $this->returnSuccess([$classes]);
            } catch (common_Exception $e) {
                $this->returnFailure($e);
            }
        } else {
            $this->returnFailure(new common_exception_MethodNotAllowed(__METHOD__ . ' only accepts GET method'));
        }
    }