First of all sorry to BUMP this topic again, is just that I had been busy the
last month and I forgot to check it.
I tried to look on the wiki, but I did not find the example fernando_jmt
mentioned. I don't think that I need a DAO (after all I have read that they
don't seem to be useful on Seam although you can use them)
For example for a person maintenance page I would like to have this classes
(plus the interfaces that may be needed)
Presentation Layer: Manages all the presentation logic for this page.
Business Layer: Manages all the business logic for the class
Data Layer: Manages all the logic related to storing the object on the database.
I think that maybe I could use the manager bean as the presentation layer
object and create there the entity manager and send it as a parameter to the
other layers when invoking the methods along with the entity bean, so I would
end up having something like this:
Presentation:
public void savePerson(EntityManager em,Person person)
{
//apply presentation logic
personBusiness.savePerson(em,person)
}
Business:
public void savePerson(EntityManager em,Person person)
{
//apply business logic
personData.savePerson(em,person)
}
Data:
public void savePerson(EntityManager em,Person person)
{
//apply data access logic
savePerson(em,person)
}
I like how the code ends up separated because I think it is easier to maintain,
however, my intuition tells me that this is not the right way to do this on
Seam and that this may end up being inefficient. For example, when developing
with hibernate I create the session on the business layer, not on presentation
and I think that there may also be some features from Seam that makes this
easier.
At the end of the day what I don't like about the examples I saw was that they
tend to mix this three layers in just one class, which seems a little messy to
me on large projects. If someone could provide me with a simple CRUD example
for this I would be very thankful.
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