public function executeControllerAction($moduleName, $controllerName, $actionName, $params = array())
 {
     $this->request->addParams($params);
     $controllerClass = Utils::toMixedCase($controllerName) . 'Controller';
     $path = APPLICATION_PATH . "/modules/{$moduleName}/controllers/{$controllerClass}.php";
     if (!file_exists($path)) {
         throw new Exception("Controller '{$controllerClass}' not found");
     }
     include_once $path;
     $controller = new $controllerClass($this->request);
     $action = Utils::toCamelCase($actionName) . 'Action';
     $controller->init($action);
     $result = $controller->{$action}();
     return $result;
 }