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public class Order

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public class SomeAppService

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    private IRepository<Product> _productRepository;


    ...


    public void AddItem(Int64 orderId, Int64 productId,

                        Int32 quantity)

    {

        Order order = _orderRepository.Get(orderId);

        Product product = _productRepository.Get(productId);


        order.AddItem(product, quantity);


        Repository<Order>.SaveOrUpdate(order);

    }

}


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  • http://codebetter.com/blogs/gregyoung Greg Young

    Just to be nit picky …

    That’s not a [Domain Service] its an [Application Service]

    Also why not introduce a CartItem value object instead of multiple parameters.

    public void AddItem(CartItem _Item)

    Ok I am done. Good post :)

  • http://www.elegantcode.com Jan Van Ryswyck

    Yes, you’re right. It would probably be an application service taking a CartItem DTO, but I didn’t want to overload the simplest example I could think of. ;-)

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  • http://gregbeech.com/blogs/tech/ Greg Beech

    So in terms of performance, the first example will execute with one round-trip to the database. The second example will need three. I hope the site this is supporting never needs to scale to a decent number of users because it won’t.

  • http://elegantcode.com Jan Van Ryswyck

    Although not shown in the first example (for simplicity), there would probably be a check for a valid order ID and a valid product ID (never trust input from the user). Then you have three DB calls as well.

  • Mark

    It really doesn’t need a parameter object (DTOs and VOs have different purposes) for that few of parameters.

    And Greg, it actually might NOT make more than one trip to the db. That is another advantage (beauty) of this.

  • http://www.figital.com Scott Fitchet

    “They’re just another piece of software to efficiently store data on disk. That’s all!”

    SQL is also (the best way I can think of) to perform deep subqueries to extract, cache, and visualize magic nuggets of live data from your well-indexed tablespaces.

    It’s not just for “crud”.

  • Mark

    “SQL is also (the best way I can think of) to perform deep subqueries to extract, cache, and visualize magic nuggets of live data from your well-indexed tablespaces.”

    SQL is not just for RDBMS.

    “It’s not just for “crud”.”
    That’s what he said.

  • http://colinjack.blogspot.com Colin Jack

    Nice post, keep up the good work.

  • http://elegantcode.com Jan Van Ryswyck

    Thx for the kind words.