Question

我正在尝试与事件调度程序进行交互，并且有一段时间想出一个解决方案。到目前为止，我有以下简单的界面：

interface EventDispatcherInterface
{
    public function fire($name, $data);
}

现在我正在尝试使用symfony的EventDispatcher来实现它。问题是symfony的dispatch方法期望第二个参数实现其Event抽象类。好的。那么现在我必须拿出一个包装类？

use Symfony\Component\EventDispatcher\Event;

class SymfonyEvent extends Event
{
    private $data;

    public function __construct($data)
    {
        $this->data = $data;
    }

    public function getData()
    {
        return $this->data;
    }
}

这是实施的第一步

use Symfony\Component\EventDispatcher\EventDispatcher as SymfonyEventDispatcher;

class SymfonyDispatcher implements EventDispatcherInterface
{
    protected $dispatcher;

    public function __construct(SymfonyEventDispatcher $dispatcher = null)
    {
        $this->dispatcher = $dispatcher ? : new SymfonyEventDispatcher;
    }

    public function fire($name, $data)
    {
        $event = new SymfonyEvent($data);

        $this->dispatcher->dispatch($name, $event);
    }
}

我如何编写不可知的事件监听器？

Answer 1

class SymfonyEventDispatcher implements EventDispatcher
{

    private $eventDispatcher;

    public function __construct(EventDispatcherInterface $eventDispatcher)
    {
        $this->eventDispatcher = $eventDispatcher;
    }

    public function dispatch(Event $event)
    {
        $listeners = $this->eventDispatcher->getListeners($event->getName());

        foreach ($listeners as $listener) {
            call_user_func($listener, $event);
        }
    }
}

来自Matthais Noback关于你的问题的精彩博客： http://php-and-symfony.matthiasnoback.nl/2014/08/symfony2-decoupling-your-event-system/

你如何界面事件调度员？

1 个答案: