interface ItemStorageInterface

interface ItemStorageInterface extends ContentEntityStorageInterface {
    
    /**
     * Returns the count of the items in a feed.
     *
     * @param \Drupal\aggregator\FeedInterface $feed
     *   The feed entity.
     *
     * @return int
     *   The count of items associated with a feed.
     */
    public function getItemCount(FeedInterface $feed);
    
    /**
     * Loads feed items from all feeds.
     *
     * @param int $limit
     *   (optional) The number of items to return. Defaults to unlimited.
     *
     * @return \Drupal\aggregator\ItemInterface[]
     *   An array of the feed items.
     */
    public function loadAll($limit = NULL);
    
    /**
     * Loads feed items filtered by a feed.
     *
     * @param int $fid
     *   The feed ID to filter by.
     * @param int $limit
     *   (optional) The number of items to return. Defaults to unlimited.
     *
     * @return \Drupal\aggregator\ItemInterface[]
     *   An array of the feed items.
     */
    public function loadByFeed($fid, $limit = NULL);

}