For aggregate access, e.g. Get me the Top 5 most recently updated contacts, this should be a query.
You could write code to instantiate 5 Contact objects, each with their own Phone, Address, etc.
objects but that is way overkill and anti-performant. Your Service layer would contain this one
method that returns the query representing these 5 contacts.
/cody
Jeff D. Chastain wrote:
I am working on a simple contact manager type application using MG Unity
and some other things I wanted to play with. I have built all of my low
level data objects (bean, dao, gateway) for a Contact, which has one or
more Addresses, which then has a State and a Country.
Where I am getting stuck is on the "service" layer. In once case, I am
looking to create functionality where an entire contact could be updated
at once by passing in a struct (i.e. the form scope). So in my mind
this means a ContactService with a method to update the contact and that
method then utilizes the different contact, address, state, and country
beans and daos.
Another requirement though is to obtain a list of the 5 most recently
updated contacts. Is this something that would go in the same
ContactService or where would this go? I have never had a good grasp on
what should go where in terms of a service layer, so I am looking for
any input on how service layers are really built and organized.
Thanks
-- Jeff
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