CQRS cross aggregate interaction + private state

headers

Nuno Lopes | 9 Feb 14:02

Re: CQRS cross aggregate interaction + private state

Maybe I can help:

class Product : IOrderableItem

....

void TestAddOrder(Order order, double qty)

{

if (this.IsObsolete())

throw new BusinessException("An obsolete product cannot be ordered")

}

void Order (Order o, double qty) {

o.AddItem(this, this.REF, this.Description, this.Price, qty)

}

.....

class Order

{

void AddItem(IOrderableItem i, string REF, string description, double price, double qty)

{

...

i.TestAddOrder(this, qty)

...... div>

this.DoAddItem(new OrderLine(REF, description, price, qty));

}

Hope it helps.

Nuno

On Feb 9, 2010, at 12:38 PM, rogeralsing wrote:

If entities only have private state, how do you deal with interaction between aggregates?

e.g.

product = GetProduct(123);
order.AddProduct(product,3);

Lets for the sake of the argument that addproduct can not occur if product is marked as obsolete.

How would you deal with that?
What's the idea behind completely private state?
Why shouldn't order be able to read properties on product?

__._,_.___

Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe

__,_._,___