ADF Architecture

ADF architecture has five different layers. ADF architecture follows MVC architecture. Like in MVC, three layers are there. Additionally, two more layers are added in ADF architecture. i.e.  Business Service Layer and Data Service Layer.

So we can explain ADF architecture by defining following layers in order.

1. View Layer
2. Controller Layer
3. Model Layer
4. Business Services Layer
5. Data Services Layer

View Layer 
This layer implements UI part of ADF application. View Layer of ADF architecture supports multiple view technologies. It works well for Browser, Desktop, Mobile technology as well.
ADF faces are used for web application. ADF Faces are built on top of the JSF technology.
ADF Swing can be used for desktop applications.

Controller Layer

Controller layer provided the control on flow of application. Re-usability is also provided by ADF Controller. Task flows are used to provide control flow and re-usability of components. State Management, Transaction Management is also done by ADF Controller.

Model Layer

Model Layer provides data to View Layer or UI in ADF application. Model Layer further divided into two parts.

1. Data control – Works as an adapter for business service layer. Provide implementation of business service layer to View Layer.
2. Data binding – Binds the data and logic of Business Service layer from Data control to the view Layer components.

Business Service Layer

Business Service Layer provided the access of Data from various Data Sources like RDBMS, Excel, CSV etc. It provides space to write business logic for application.

Business components, Beans, POJO, Web services are the part of business Service Layer.

Data Service

Data Source provides the Data for the application. Data can be fetched from various Data sources like Database, Web Services etc.