Hi,
Does anybody can tell me what are all the (Java/J2EE) patterns used in
Struts framework?
Thanks in advance.
Surya
I can't tell you all of them, but one of them is the Command Pattern.
IIRC, when a request of a certain type is received, a front end
servlet (Front Controller pattern) encapsulates the processing in some
a subcass of something like "ActionBean" which conforms to the Command
interface (e.g., implements an "execute" method). This execute method
is then called by something inside the framework, probably the
FrontController servlet itself.
IIRC, the ActionBean's execute method will invoke some kind of a
business service. The ActionBean itself might be an example of
ServiceToWorker, and the class on which it invokes the service may be
an example of a Business Delegate pattern. The Business Delegate in
turn invokes the actual service on a Stateless Session bean, in an
example of the Session Facade pattern.
That call might return some data to be displayed in a JSP page. The
data should be contained in a java class whose only purpose is to hold
information, which is a ValueObject.
The JSP page is template-based in Struts, so that would be an example
of CompositeView.
which.
There is also the whole underlying (overarching?) theme of MVC, where
the JSP Pages represent the View, the FrontController/Helper classes
and Session Beans the Control, and the Entity Beans the model.
Sam90
