class KeyValueContentEntityStorage

class KeyValueContentEntityStorage extends KeyValueEntityStorage implements ContentEntityStorageInterface {
    
    /**
     * {@inheritdoc}
     */
    public function createTranslation(ContentEntityInterface $entity, $langcode, array $values = []) {
        // @todo Complete the content entity storage implementation in
        //   https://www.drupal.org/node/2618436.
    }
    
    /**
     * {@inheritdoc}
     */
    public function hasStoredTranslations(TranslatableInterface $entity) {
        return FALSE;
    }
    
    /**
     * {@inheritdoc}
     */
    public function createRevision(RevisionableInterface $entity, $default = TRUE, $keep_untranslatable_fields = NULL) {
        return NULL;
    }
    
    /**
     * {@inheritdoc}
     */
    public function createWithSampleValues($bundle = FALSE, array $values = []) {
    }
    
    /**
     * {@inheritdoc}
     */
    public function loadMultipleRevisions(array $revision_ids) {
        return [];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getLatestRevisionId($entity_id) {
        return NULL;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getLatestTranslationAffectedRevisionId($entity_id, $langcode) {
        return NULL;
    }
    
    /**
     * {@inheritdoc}
     */
    public function loadRevision($revision_id) {
        return NULL;
    }
    
    /**
     * {@inheritdoc}
     */
    public function deleteRevision($revision_id) {
        return NULL;
    }

}