Learn Java for Web Development

156 CHAPTER 3: Best Practices in Java EE Web Development

Front Controller

The front controller does the following:

   Centralizes request processing

   Delegates to the view using the dispatcher

   Uses a view helper to separate the business logic concerns with the

presentation logic concerns

Dispatcher

The dispatcher does the following:

   Is responsible for view management and navigation

   Delegates to the view

   Uses a helper to push data into the view

Helper

The helper does the following:

   Helps the view or the controller to complete its processing

   Pushes data into the view

Client Front

Controller Dispatcher View

Helper

delegates

View

Helper

uses

Figure 3-17. Service to Worker class diagram