The above illustration shows our sample application. It is divided into the classical three tiers: Presentation Layer, which is the interface to the user, business layer, which handles the data objects and modifies them and Data Layer, which consists of a database that loads and stores data. In our example, the business layer is further divided into: (1) The service layer, which provides services to the presentation layer, controls the flow of the application and modifies data objects; and (2) the data access layer which deals with the communication to the database.
The illustration also shows that this sample comes in 3 variations:
All samples use the core module, which contains the interfaces and the data objects.