domaindrivendesign at Yahoo! Groups

Re: Design help

Dan Haywood — Sat, 04 Jul 2009 22:35:27 GMT

... I would introduce the User concept even if all I've done is identified the concept and nothing else. I tend to find that after a while one finds

Re: Design help

evgshapiro — Sat, 04 Jul 2009 22:06:05 GMT

If the problem is limited to only News then no User concept is introduced yet. We have a Visitor that is came to us from a repository. The repo constructs the

Re: Design help

Dan Haywood — Sat, 04 Jul 2009 14:12:37 GMT

... Okay, well that's helpful. I'd still argue for a User domain object; it's one of the important concepts in your domain. ... Crikey, does that scale?

Re: Design help

dee3lmo — Sat, 04 Jul 2009 13:31:55 GMT

Dan, Thanks for your prompt reply. The user is identified by the getRemoteUser() method (on the Request object). It is just a String object, so I don't think I

Re: Design help

Dan Haywood — Sat, 04 Jul 2009 13:14:19 GMT

... In your first post you said: "A business rule is that the user can only get a news item once. " So you need the concept of User in your domain somewhere.

Re: Design help

dee3lmo — Sat, 04 Jul 2009 12:58:14 GMT

Hi Dan, The thing you say about Request and Response seems to be true. I've never thought about it in that way. However, I don't get what you mean with the

Re: Design help

dee3lmo — Sat, 04 Jul 2009 12:55:25 GMT

Hi Carfield, Could you please more elaborate? Is facade a domain concept and in which module (package) should it go? Could you please give a (simple) example?

Re: Design help

Dan Haywood — Sat, 04 Jul 2009 07:17:24 GMT

... It sounds like you should abstract up to the essence of what these objects represent. Request and Response aren't really concepts that are specific to the

Re: Design help

Carfield Yim — Sat, 04 Jul 2009 04:58:33 GMT

How about having facade for those object?

Re: Presentation Models

Hendry Luk — Sat, 04 Jul 2009 03:44:01 GMT

I'll pick an example from Greg's example of adding item to order, and try to put my understanding of the presentation into this code. We have a AddProduct

Design help

dee3lmo — Fri, 03 Jul 2009 20:50:32 GMT

Hi group, I need some help how to model the following problem: The application I want to model is a web application. The application provides news items on an

Aggregate Root: Consistency boundaries for transactions

jps737 — Fri, 03 Jul 2009 20:26:45 GMT

Hello, The architectural context here is event sourcing, CQS, and SOA. So if aggregate roots form consistency boundaries for transactions... Am I correct in

Re: Presentation Models

Carfield Yim — Fri, 03 Jul 2009 14:35:48 GMT

Would you mind post some code? Does interface help? ... Would you mind post some code? Does interface help? On Fri, Jul 3, 2009 at 10:03 PM, Hendry Luk <

Re: Presentation Models

Hendry Luk — Fri, 03 Jul 2009 14:04:57 GMT

Extracting into reusable methods become harder when we deal with 2 different domains and separate bounded-context. I can only refactor so much, but i still

Re: Presentation Models

Carfield Yim — Fri, 03 Jul 2009 13:39:24 GMT

Sorry to jump in to the discussion.... in fact I am not exactly sure if I understand your question totally.... but if you find that are duplication of logic,