ProductPageCriteriaEvent example

if (!$productId) {
            throw RoutingException::missingRequestParameter('productId', '/productId');
        }

        $criteria = (new Criteria())
            ->addAssociation('manufacturer.media')
            ->addAssociation('options.group')
            ->addAssociation('properties.group')
            ->addAssociation('mainCategories.category')
            ->addAssociation('media');

        $this->eventDispatcher->dispatch(new ProductPageCriteriaEvent($productId, $criteria, $context));

        $result = $this->productDetailRoute->load($productId, $request, $context, $criteria);
        $product = $result->getProduct();

        if ($product->getMedia()) {
            $product->getMedia()->sort(fn (ProductMediaEntity $a, ProductMediaEntity $b) => $a->getPosition() <=> $b->getPosition());
        }

        if ($product->getMedia() && $product->getCover()) {
            $product->setMedia(new ProductMediaCollection(array_merge(
                [$product->getCover()->getId() => $product->getCover()],