Hi ranveer singh
Persistent classes are classes in an application that implement the entities of the business problem
View Controller
Each view has exactly one view controller, which processes the actions performed by the user in the view.
A view also has exactly one view context, which contains the data required for the view.
A view controller and the corresponding context exist at least as long as the view is displayed
in the browser; if the view is replaced by a subsequent view, the local data is no longer
available. However, the lifetime can also be connected to the lifetime of the surrounding
component.
Global Controllers
Each Web Dynpro component additionally contains at least one global controller that is visible
within the component for all other controllers. Once the data for this component controller
have been created the first time they are accessed, the lifetime extends to cover the whole
period during which the component is in use.
You can add additional global controllers in the form of custom controllers. These also last as
long as the component and the data they contain are available to all views of the component.
Every time there is a Web Dynpro window, a further global controller – the Window controller
– is added to the component.
Interface Controller
Each Web Dynpro component contains exactly one component controller. This controller is a
global controller that is visible also outside the component.
Communication from one controller to the next is achieved by calling methods from a different
controller, or by triggering an event on which other controllers are already registered. You
define these controller uses when you create a controller.
Regards
Sarath
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