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[4.3] Update UPGRADE guide of 4.3 for EventDispatcher #33115

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Aug 13, 2019
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[4.3] Update UPGRADE guide of 4.3 for EventDispatcher #33115

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31 changes: 30 additions & 1 deletion UPGRADE-4.3.md
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Expand Up @@ -54,7 +54,36 @@ Dotenv
EventDispatcher
---------------

* The signature of the `EventDispatcherInterface::dispatch()` method should be updated to `dispatch($event, string $eventName = null)`, not doing so is deprecated
* The signature of the `EventDispatcherInterface::dispatch()` method has been updated, consider using the new signature `dispatch($event, string $eventName = null)` instead of the old signature `dispatch($eventName, $event)` that is deprecated

You have to swap arguments when calling `dispatch()`:

Before:
```php
$this->eventDispatcher->dispatch(Events::My_EVENT, $event);
```

After:
```php
$this->eventDispatcher->dispatch($event, Events::My_EVENT);
```

If your bundle or package needs to provide compatibility with the previous way of using the dispatcher, you can use `Symfony\Component\EventDispatcher\LegacyEventDispatcherProxy::decorate()` to ease upgrades:

Before:
```php
public function __construct(EventDispatcherInterface $eventDispatcher) {
$this->eventDispatcher = $eventDispatcher;
}
```

After:
```php
public function __construct(EventDispatcherInterface $eventDispatcher) {
$this->eventDispatcher = LegacyEventDispatcherProxy::decorate($eventDispatcher);
}
```

* The `Event` class has been deprecated, use `Symfony\Contracts\EventDispatcher\Event` instead

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