Dispatcher View

Core J2EE Patterns - Dispatcher View
Core J2EE Patterns
Dispatcher - Wikipedia, the free encyclopedia
Pro JavaTM EE Spring Patterns: Best ... - Dhrubojyoti Kayal - Google Books
DispatcherServlet (Spring Framework)

Problem domain:


Core J2EE Patterns

• Problem:
• You want a view to handle a request and generate a response, while managing limited amounts of business processing.
• Forces:
• You have static views
• You have views generated from an existing presentation model.
• You have views which are independent of any business service response.
• You have limited business processing.

Pro Java EE Spring Patterns

• Basically the same.

Solution:

Pro Spring Patterns

What are the differences?

• Logically they are the same.
• Simple business processes will be configured into the controller using IoC/AOP container, so that business process will be out of the scope of the main process flow. This is the power of declarable service injection and decoupling.
• By decoupling business processes, the whole process flow is a simple mapping url dispatching flow
• Find the corresponding URL
• Create the view
• Render it.

Pre-assumption

• The business processes should be simple enough to inject into the the controller
• Simple input/output parameter
• Simple work flow