SalesChannelRepositoryIterator example

->setOffset($exportBehavior->offset())
            ->setLimit($this->readBufferSize);

        foreach ($associations as $association) {
            $criteria->addAssociation($association);
        }

        $this->eventDispatcher->dispatch(
            new ProductExportProductCriteriaEvent($criteria, $productExport, $exportBehavior, $context)
        );

        $iterator = new SalesChannelRepositoryIterator($this->productRepository, $context, $criteria);

        $total = $iterator->getTotal();
        if ($total === 0) {
            $exception = new EmptyExportException($productExport->getId());

            $loggingEvent = new ProductExportLoggingEvent(
                $context->getContext(),
                $exception->getMessage(),
                Level::Warning,
                $exception
            );