J2EE Design Patterns

[Sai Swami]

Hi Fellow Ranchers,

Can anyone tell me if the variants of J2EE design patterns need to be memorized for the SCEA 310-052 exam?


There are too many variants of the same design pattern in the Core J2EE Patterns book by Alur, Crupi, et al. Huh !




~ Sai

[Cameron Wallace McKenzie]

Well, you really need to know the bassics of them, that's all. They don't get into intricate detail, but if you know the benefits and drawbacks of each, you'll do fine.

-Cameron McKenzie

[Chenna Krishna]

You need to map the design pattern for a given problem or situation...correct me if I am wrong.

Thanks,
Krishna

[Cameron Wallace McKenzie]

On part I, they'll ask a question like:

which design pattern helps minimize network traffic:

value object
business delegate
session facade


From there, you just have to nail the right pattern, which here would be value object. I don't recall the questions going all that deep. I find some of the design patterns rather confusing when the books start going deep into them. You're probably finding the same thing with all the 'variants' and stuff. In the end, I actually found the design pattern questions the easiest ones on the exam, becuase they're pretty high level.

-Cameron McKenzie

[Sai Swami]

Thanks Cameron. That helped.

[Kevin McMahon]

Er....

would the session facade not help with reducing network traffic too?

"The Session Facade also impacts performance. The Session Facade reduces network overhead between the client and the server because its use eliminates the direct interaction between the client and the business data and business service objects. Instead, all interactions are routed via the Session Facade in a coarse-grained manner. The Session Facade and its participants are closer to each other, making it more efficient for the facade to manage interactions between the participant objects. All data transfer and method invocations from the facade to the participants are presumably on a relatively high-speed network. The network performance can be further tuned to provide maximum throughput by applying the Transfer Object pattern for the participant objects where applicable. "

source: http://java.sun.com/blueprints/corej2eepatterns/Patterns/SessionFacade.html

[Chenna Krishna]

All,

What is difference between Design Patterns & J2EE Design patterns? Hope both are the same.
Please clarify.
Thanks,
Chenna K

[J J Wright]

What is difference between Design Patterns & J2EE Design patterns?

J2EE simply refers to the domain within which the pattern exists, i.e. it's high-level context.