*/ public function retrieve( $filters=array(), $limit=0, $offset=0 ); /** * Retrieve single item * * @param int $id * * @return Product */ public function retrieve_single( $id ); /** * Returns number of rows for given filters * * @param array $filters * * @return int */ public function num_rows( $filters=array() ); /** * @param Product $product * * @return bool */ public function persist( $product ); }