Granny's Programming Pearls
"inside of every large program is a small program struggling to get out"
JavaRanch.com/granny.jsp
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Bear Bibeault
  • Devaka Cooray
  • Liutauras Vilda
  • Jeanne Boyarsky
Sheriffs:
  • Knute Snortum
  • Junilu Lacar
  • paul wheaton
Saloon Keepers:
  • Ganesh Patekar
  • Frits Walraven
  • Tim Moores
  • Ron McLeod
  • Carey Brown
Bartenders:
  • Stephan van Hulst
  • salvin francis
  • Tim Holloway

Confused about Pet Store controllers and J2EE patterns  RSS feed

 
Ranch Hand
Posts: 86
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
After some studying Pet Store WAF, J2EE patterns and Cade's component diagrams some questions came up...

How does Pet Store Web Controller relate with patterns Business Delegate and Service Locator? Can we think of Web controller as a component including Business Delegate and Service Locator?

Can we think of EJB Controller as a session facade? Cade is using stateless session bean, WAF EJB Controller is a stateful one (why?).

In general.. do you think we should model WAF controllers as components or J2EE patterns as components (as Cade is modeling Service Locator)?

Thanks,
Tomi
 
Ranch Hand
Posts: 344
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Tomi,
P375, Fourth paragraph, of Blueprints says that a local architecture (which PetStore is) does not need BusinessDelegates and ServiceLocators. The WebController passes an Event to the EJBController. The EJBController has a command pattern which passes the event to the correct Session Facade (note. Doesn't have to be a Session Facade. Could be a POJO).

The EJBController is stateful because it is storing conversational state on behalf of a client (i.e. shopping cart).

Choosing between WAF Controllers or J2EE patterns as components is a tough one. Hopefully, someone who's passed can answer better. I suppose you can do either as long as the comments explain things. Do you model based on Cade or Petstore?

Ray
 
With a little knowledge, a cast iron skillet is non-stick and lasts a lifetime.
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!