The Immutable Event Dispatcher
Edit this pageThe Immutable Event Dispatcher
The ImmutableEventDispatcher is a locked or frozen event dispatcher. The dispatcher cannot register new listeners or subscribers.
The ImmutableEventDispatcher takes another event dispatcher with all
the listeners and subscribers. The immutable dispatcher is just a proxy
of this original dispatcher.
To use it, first create a normal EventDispatcher dispatcher and register
some listeners or subscribers:
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use Symfony\Component\EventDispatcher\EventDispatcher;
use Symfony\Contracts\EventDispatcher\Event;
$dispatcher = new EventDispatcher();
$dispatcher->addListener('foo.action', function (Event $event): void {
// ...
});
// ...Now, inject that into an ImmutableEventDispatcher:
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use Symfony\Component\EventDispatcher\ImmutableEventDispatcher;
// ...
$immutableDispatcher = new ImmutableEventDispatcher($dispatcher);You'll need to use this new dispatcher in your project.
If you are trying to execute one of the methods which modifies the dispatcher
(e.g. addListener()), a BadMethodCallException is thrown.
This work, including the code samples, is licensed under a
Creative Commons BY-SA 3.0
license.
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