Re: Sharing binaries/code between client and server in a DDD environment

The objects you've defined below seem to be functioning more as data
transfer objects (DTOs) rather than value objects. Especially since you
have them as part of your service layer, which is outside of the domain
model, if I am understanding you correctly.

If they are, in-fact, value objects in your domain model, they should be
immutable and I would recommend you implement everything that flows out of
that choice. In that case, I have no issues sharing them, so long as you
adhere to the guidelines for shared kernel:
https://domainlanguage.com/ddd/patterns/DDD_Reference_2011-01-31.pdf.

Cheers,
Paul.

On Thu, May 22, 2014 at 8:18 AM, Alastair van Leeuwen
[email protected] [domaindrivendesign] <
[email protected]> wrote:

>
>
> Hi,
>
> How appropriate is it when sharing binaries or code between a client and
> a server in a DDD environment.
> I by no means advocate sharing the entire Model but just certain common
> aspects.
>
> For example, when using C# with WCF, it is accepted if the service
> interfaces are shared between the client and the server.
> What if this is taken one step further?
>
> For example:
> interface ICustomerMaintenance
> {
>  void CreateCustomer(string Name, string Surname, Sex sex, PhoneNumber
> mobileNumber, PhoneNumber landNumber, ...);
> }
>
> Sex is defined as:
>     enum Sex
>     {
>         Male, Female
>     }
>
> PhoneNumber is a value object defining a phone number.
>
> Although Sex and PhoneNumber are both Value Objects, can they not be
> defined in some common area and shared?
> It seems like extra complexity if these value objects must be re-created
> on the client side.
>
> When sharing these domain concepts in both the client and server, is there
> a special name for it?
> Is it a Shared Kernel or is this term used only when integrating between
> Bounded Context?
>
> There are already common value objects available in C#, such as DateTime.
> If a DateTime did not exist in C#, surely it does not have to be
> re-created on the client and server?
>
> Kind regards,
> Alastair
>
>
>
>
>
>  
>