Listener for image uploading

ImageListener.php

<?php

    public function onFlush(OnFlushEventArgs $args)
    {
        $em     = $args->getEntityManager();
        $uow    = $em->getUnitOfWork();
                
        foreach ($uow->getScheduledEntityInsertions() as $entity) {
            
            if ($entity instanceof ImageInterface) {
                                
                $filename = $this->manager->upload($entity);
                $entity->setFilename($filename);
                
                $metadata = $em->getClassMetadata(get_class($entity));                
                $uow->computeChangeSet($metadata, $entity);                      
            }
        }        
        
    }