我遵循Symfony 4.3文档创建了一个自定义事件,调度它并监听它。跟踪控制器的执行情况,事件分配器似乎找不到任何订阅者,而且我无法弄清楚自己在做什么错。
我的事件类非常基础:
namespace App\Event;
use Symfony\Contracts\EventDispatcher\Event;
class TestEvent extends Event
{
public const NAME = 'test.event';
protected $data;
public function __construct(string $data)
{
$this->data = $data;
}
public function getData(): string
{
return $this->data;
}
}
我的控制器实例化并调度事件:
class TestController extends AbstractController
{
private $eventDispatcher;
public function __construct(EventDispatcherInterface $eventDispatcher, LoggerInterface $logger)
{
$this->eventDispatcher = $eventDispatcher;
}
/**
* @Route("/event", name="event_test")
*/
public function eventTest()
{
$event = new TestEvent('Event string');
$this->eventDispatcher->dispatch($event);
return $this->render('Test/TestEvent.html.twig', [
'title' => 'Test Event',
]);
}
}
我设置了一个订户来监听事件并记录日志。为了确保订阅者正常工作,我还订阅了一个内核事件(有效):
namespace App\EventSubscriber;
use App\Event\TestEvent;
use Psr\Log\LoggerInterface;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpKernel\KernelEvents;
class TestSubscriber implements EventSubscriberInterface
{
private $logger;
public function __construct(LoggerInterface $logger)
{
$this->logger = $logger;
}
public static function getSubscribedEvents()
{
return [
TestEvent::NAME => [['onTestEvent', 20]],
KernelEvents::REQUEST => 'onKernelRequest',
];
}
public function onTestEvent(TestEvent $event)
{
$this->logger->info('Subscriber says: Found test event');
$this->logger->info('Subscriber says: Test event posted this data {data}', [
'data' => $event->getData(),
]);
}
public function onKernelRequest()
{
$this->logger->info('Got Kernel Request');
}
}
当我访问/ event URL时,我看到了预期的输出,并且日志显示了Kernel请求,但没有显示test.event日志。
根据文档,我跑了
php bin/console debug:event-dispatcher test.event
在控制台上
订单可调用优先级
#1 App \ EventSubscriber \ TestSubscriber :: onTestEvent()20
这告诉我订户已注册,但由于某种原因未被注册。任何帮助都太棒了!
(顺便说一句,我也尝试了一个事件监听器,并且得到了相同的结果。)
谢谢!
在symfony 4.3中,如果您调度像这种$this->eventDispatcher->dispatch($event);
dispather使用方法get_class($event)
那样的事件作为事件名称,那么在您的订户中您需要更改
TestEvent::NAME => [['onTestEvent', 20]],
至
TestEvent::class=> [['onTestEvent', 20]],
对于侦听器,请使用以下命令:
App\Event\TestListener:
tags:
- { 'name': 'kernel.event_listener', 'event': 'App\Event\TestEvent', 'method': 'onTestEvent' }
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