/**
* Finds and returns list of attributes associated with selected product by it's ID.
*
* @param $productId int Product ID.
* @return array List of attributes attached to selected product.
*/
public function getAttributes($productId)
{
if (!isset($this->productAttributes[$productId])) {
$this->productAttributes[$productId] = $this->service->getAttributes($productId);
}
return $this->productAttributes[$productId];
}