setOperations example

if (!empty($queueId)) {
            $newBackup = false;
            /** @var QueueModel|null $queue */
            $queue = $entityManager->find(QueueModel::class, $queueId);
            if (!$queue) {
                throw new RuntimeException(sprintf('Queue with ID %s not found', $queueId));
            }
        } else {
            $newBackup = true;
            $queue = new QueueModel('product');
            $queue->setFilterString($filterString);
            $queue->setOperations(json_encode($operations));
            $queue->setCreated(new DateTime());
            $queue->setActive(false);
            $queue->setInitialSize($totalCount);

            $entityManager->persist($queue);
            $entityManager->flush();

            $queueId = $queue->getId();
        }

        $this->getBackupResource()->create($results, $operations, $newBackup, $queue->getCreated() ? $queue->getCreated()->getTimestamp() : time());