问Zend框架2: AbstractListenerAggregate

EN

class ApiErrorListener extends AbstractListenerAggregate {
    public function attach(EventManagerInterface $events)
    {
        $this->listeners[] = $events->attach(MvcEvent::EVENT_RENDER, __CLASS__ . '::onRender', 1000);
    }

    public static function onRender(MvcEvent $e)
    {
        if($e->getResponse()->isOk())
        {
            return;
        }

        $httpCode = $e->getResponse()->getStatusCode();
        $sm = $e->getApplication()->getServiceManager();
        $viewModel = $e->getResult();
        $exception = $viewModel->getVariable('exception');

        $model = new JsonModel(
            array(
                'errorCode' => !empty($exception) ? $exception->getCode() : $httpCode,
                'errorMsg' => !empty($exception) ? $exception->getMessage() : NULL
            )
        );

        $model->setTerminal(true);

        $e->setResult($model);
        $e->setViewModel($model);
        $e->getResponse()->setStatusCode($httpCode);
    }

}