Java Reference
In-Depth Information
The participant diagram and the collaboration diagram of the
mechanism are shown below.
Figure
7:
Presentation
Request
Processing
-
Class
Diagram
The following key architectural decisions have been captured
by the Presentation Request Processing mechanisms:
• All user requests are handled by a single web Controller (the
front controller of the application)
• The front controller forwards the request to the appropriate
Command Handler with the help of resource and access
mapping information stored in the form of an XML file
(BackingBean.xml)
• Command Handler manages user interactions for a specific
use case and co-ordinates use case interactions with the user.
• The Command Handlers does not perform business logic.
Instead, they use Business delegates as the Business provider
to the Application Server services.
• The Command Handlers do not produce any User output.
Instead, they call views to create HTML type of a stream that
is returned to the user.
• Views are implemented as JSPs.
