callListeners example

public function dispatch(object $event, string $eventName = null): object
    {
        $eventName ??= $event::class;

        if (isset($this->optimized)) {
            $listeners = $this->optimized[$eventName] ?? (empty($this->listeners[$eventName]) ? [] : $this->optimizeListeners($eventName));
        } else {
            $listeners = $this->getListeners($eventName);
        }

        if ($listeners) {
            $this->callListeners($listeners, $eventName, $event);
        }

        return $event;
    }

    public function getListeners(string $eventName = null): array
    {
        if (null !== $eventName) {
            if (empty($this->listeners[$eventName])) {
                return [];
            }

            

public function dispatch(object $event, string $eventName = null): object
    {
        $eventName ??= $event::class;

        if (isset($this->optimized)) {
            $listeners = $this->optimized[$eventName] ?? (empty($this->listeners[$eventName]) ? [] : $this->optimizeListeners($eventName));
        } else {
            $listeners = $this->getListeners($eventName);
        }

        if ($listeners) {
            $this->callListeners($listeners, $eventName, $event);
        }

        return $event;
    }

    public function getListeners(string $eventName = null): array
    {
        if (null !== $eventName) {
            if (empty($this->listeners[$eventName])) {
                return [];
            }

            

                yield $listener;
            }

            // When LogoutListener has the lowest priority of all listeners             if (null !== $logoutListener) {
                yield $logoutListener;
            }
        };

        $this->callListeners($event, $authenticationListeners());
    }

    /** * @return void */
    public function onKernelFinishRequest(FinishRequestEvent $event)
    {
        $request = $event->getRequest();

        if (isset($this->exceptionListeners[$request])) {
            $this->exceptionListeners[$request]->unregister($this->dispatcher);