int|null getListenerPriority(string $eventName, callable $listener) Gets the listener priority

class ImmutableEventDispatcher implements

addListenerService(string $eventName, array $callback, int $priority) Adds a service as event listener

addSubscriberService(string $serviceId, string $class) Adds a service as event subscriber.

stopPropagation() Stops the propagation of the event to further event listeners. If multiple

array getListeners(string $eventName = null) Gets the listeners of a specific event or all listeners

int|null getListenerPriority(string $eventName, callable $listener) Gets the listener priority

interface EventSubscriberInterface An EventSubscriber knows himself what events he is interested

bool offsetExists(string $key) ArrayAccess has argument.

removeListener(string $eventName, callable $listener) Removes an event listener from the specified