And to clarify... it's important when saying "aggregate" to distinguish between an instance and a type. When a particular instance 'b' of aggregate B is...
20756
Nuno Lopes
nbplopes
Dec 16, 2010 6:00 pm
... Yes. But if the rule is in the Order one can implement for speed in the the UI rather then in the Service, making the service check redundant as it serves...
20757
sebaszipp
Dec 16, 2010 6:56 pm
And what about If I say that customers are categorized in two different types where the first group is allowed for ordering if the unpaid orders total is not...
20758
Nuno Lopes
nbplopes
Dec 16, 2010 7:22 pm
I Sebastian, Glad you starting to see the benefit of defining the value type Order.Customer. If you use the suggestion then it would be simply a matter of...
20759
vvernon_shiftmethod
vvernon_shif...
Dec 18, 2010 4:58 am
Hi All, I was checking my LinkedIn updates and noticed that Dan Haywood has gotten his project into the Apache Incubator process. It is registered under...
20760
tnabil76
Dec 19, 2010 6:06 am
Very good point, Vaughn. People might think that if they just put the id instead of a reference, they can make sure that no one can do cross-aggregate changes....
20761
tnabil76
Dec 19, 2010 10:25 am
Hi Greg, I took a very quick look at LINQ but it doesn't look much like specifications to me. In fact, it looks a lot like the JPA 2.0 Criteria API with better...
20762
tnabil76
Dec 19, 2010 11:13 am
Hi Vaughn, I came across the memo below which seems to be addressing the polling problem (#2 below). ...
20763
Greg Young
gumboismadeo...
Dec 19, 2010 2:41 pm
Look more deeply it also handles converting arbitrary expressions to arbitrary backing mechanisms as an example On 2010-12-19 5:25 AM, "tnabil76";...
20764
Dan Haywood
danhaywood...
Dec 19, 2010 4:11 pm
... Thanks for that, Vaughn. ... We currently working to a v0.1 release, hopefully around the end of Jan. ... Oh yes, indeed. The proposal page ...
20765
Angel Java Lopez
ajlopez2000
Dec 19, 2010 5:25 pm
Hi people! A doubt/question: Can a repository represent something interesting/important for the domain? I could use a FullfilledOrders repository, and a...
20766
vvernon_shiftmethod
vvernon_shif...
Dec 19, 2010 9:43 pm
Thanks Tarek, and yes there have been proposals for turning HTTP/Atom/web style notifications into a push rather that pull approach. In harmony with the point...
20767
Finn Neuik
finnnk
Dec 20, 2010 1:22 am
It's really lambdas that are the specifications, but you'd usually use them against a collection to do something useful and that's where LINQ comes in. Some...
20768
tnabil76
Dec 20, 2010 5:45 am
Hi Vaughn, As I said earlier, I'm an expert in neither REST nor Atom, but I'm getting really interested in the subject. The reason is I "feel" that the...
20769
vvernon_shiftmethod
vvernon_shif...
Dec 20, 2010 6:41 am
True, there are a variety of reasons why web is attractive. As far as Atom format there is not much to learn, and as I think you use Java you can employ ROME....
20770
tnabil76
Dec 20, 2010 7:04 am
Thanks a lot for the detailed explanation. In your approach, is that Atom-like format still compliant with the protocol? I think one of the main benefits of a...
20771
vvernon_shiftmethod
vvernon_shif...
Dec 20, 2010 7:59 am
I think all of your questions will be sufficiently answered in the book I previously mentioned, "REST in Practice". They discuss when to use Atom and when not...
20772
tnabil76
Dec 20, 2010 9:15 am
I've read some mixed reviews of the book but still maybe it's worth reading. Now, the framework is another issue altogether. The ones you mentioned are...
20773
vvernon_shiftmethod
vvernon_shif...
Dec 20, 2010 4:03 pm
BTW, if you are reading the one-star review on Amazon, it should be removed. The guy was looking for a cookbook, which is available from the same publisher....
20774
sebaszipp
Dec 20, 2010 5:56 pm
As far as I know, an aggregate can temporaly know an AR (as a message parameter) but I have never let an agg hold a reference to another: This is wrong: Order...
20775
Jason Marston
marston.jason
Dec 20, 2010 6:25 pm
Hi Angel, The best answer is that if this is a useful abstraction for the SUD then certainly, as long as you check to make sure you will not get a repository...
20776
johan.kson
Dec 20, 2010 7:12 pm
Still being a newbie (that is me); That means that tools like entity framework as an OR/mapper cannot be used since references to other AR are created? Or...
20777
Giorgio Sironi
giorgiosiron...
Dec 20, 2010 7:37 pm
... Domain-Driven Design by Eric Evans, page 109: "Objects within the AGGREGATE can hold references to other AGGREGATE roots." You can't hold references to...
20778
sebaszipp
Dec 20, 2010 8:36 pm
According the the blue book Aggregate roots can hold reference to other Aggregate Roots just like User - Group or Car - Engine. I meant that many times...
20779
tnabil76
Dec 21, 2010 4:37 am
I remember the guy with the one star review was stating the opposite; he was saying the book got bogged down in the details of the example and didn't address...
20780
tnabil76
Dec 21, 2010 4:47 am
Hi, As Giorgio just quoted, objects within the aggregate - not just the root - can hold references to other aggregates according to the book. Some might...
20781
Greg Young
gumboismadeo...
Dec 21, 2010 1:51 pm
And its very common to do this. If anything the only potential downfall is it cam lead to people breaking boundaries. Definitely a personal preference On...
20782
vvernon_shiftmethod
vvernon_shif...
Dec 21, 2010 5:01 pm
I took a moment to look at Jim Webber's blog entry, which I think is the same you were referring to. The strength of Restfulie is in HATEOAS, which is really...
20783
tnabil76
Dec 22, 2010 5:42 am
Well, as I'm completely new to this, I still feel that I'm not able to completely appreciate HATEOAS (BTW, how do you pronounce that?) I don't feel bad about...
20784
Rickard Öberg
rickardoberg
Dec 22, 2010 5:59 am
... One of the big differences for me, working with REST and HATEOAS, has been the "a-ha" moment as I decide not to include links in representations, meaning,...
