module shoppingCart{
    struct Product{
        long productId;
        string productName;
        double productPrice;
    };

    struct ProductOrder {
        long productOrderId;
        Product product;
        double productQuanity;
    };
    typedef sequence<Product> ListOfProducts;
    typedef sequence<ProductOrder> Orders;
    struct Cart {
     Orders orders;
    };

    interface Shop {
        ListOfProducts showAvailableProducts();
        Cart createNewCart();
    };

    interface CartManager {
        Cart createNewCart();
        boolean addToCart(in ProductOrder productOrder);
        boolean removeFromCart(in ProductOrder productOrder);
        boolean checkOutCart();
    };
};