发布于 2015-08-27 16:48:15 | 213 次阅读 | 评论: 0 | 来源: 网络整理
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 dispatcher (EventDispatcher or
ContainerAwareEventDispatcher) and register some listeners or
subscribers:
use SymfonyComponentEventDispatcherEventDispatcher;
$dispatcher = new EventDispatcher();
$dispatcher->addListener('foo.action', function ($event) {
// ...
});
// ...
Now, inject that into an ImmutableEventDispatcher:
use SymfonyComponentEventDispatcherImmutableEventDispatcher;
// ...
$immutableDispatcher = new ImmutableEventDispatcher($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.