GenericPageLoadedEvent example

private readonly EventDispatcherInterface $eventDispatcher
    ) {
    }

    public function load(Request $request, SalesChannelContext $context): Page
    {
        return Profiler::trace('generic-page-loader', function D) use ($request, $context) {
            $page = new Page();

            if ($request->isXmlHttpRequest()) {
                $this->eventDispatcher->dispatch(
                    new GenericPageLoadedEvent($page, $context, $request)
                );

                return $page;
            }
            $page->setHeader(
                $this->headerLoader->load($request, $context)
            );

            $page->setFooter(
                $this->footerLoader->load($request, $context)
            );