Java Enterprise Edition (JEE) Core Design Patterns JEE Core Design - - PowerPoint PPT Presentation
Java Enterprise Edition (JEE) Core Design Patterns JEE Core Design Patterns Presentation Business Integration Tier Tier Tier Intercepting Filter Business Delegate Data Access Object Front Controller Service Locator Service
JEE Core Design Patterns Presentation Tier Business Tier Integration Tier
Intercepting Filter Front Controller Context Object
App Controller View Helper
Composite View
Service to Worker Dispatcher View
Service Locator Session Facade Application Service
Business Object
Business Delegate
Composite Entity Transfer Object TO Assembler Value List Handler
Data Access Object Service Activator Domain Store
Web Service Broker
http://java.sun.com/blueprints/corej2eepatterns/Patterns/FrontController.html
– across views & session – can be used to inject cross-cutting concerns
– http://server/resource.jsp – http://server/servlet/resourceController – actually we can map multiple requests to the same controller
– controllers can be specialized (sub-classing) – dynamically or declaratively mapped – what is declarative mapping – why do we care?
http://java.sun.com/blueprints/corej2eepatterns/Patterns/InterceptingFilter.html
filter1 filter2 request response controller request request response response Filter chain
– filter chains can be defined in a number of ways
http://java.sun.com/blueprints/corej2eepatterns/Patterns/DataAccessObject.html
– identifier, foreignkey – object to single table – how do we map associations
– how do we map inheritance
– single object deletions are easy – deleting associated objects could cause violations
– allow to vary schema differently from object model
User id fname Group id name lname belongs