Oracle ADF & JDeveloper Business Components Simplify Data Access and Validation

Oracle ADF Model Layer

                   

 In the model layer, Oracle ADF Model implements the JSR-227 service abstraction called the data control. Data controls abstract the implementation technology of a Business service by using standard metadata interfaces to describe the service’s operations and data collections, including information about the properties, methods, and types involved. Using JDeveloper, you can view that information as icons that you can then drag and drop onto a page. At that point, JDeveloper automatically creates the bindings from the page to the services. At runtime, the ADF Model layer reads the information describing your data controls and data bindings from appropriate XML files and implements the two-way connection between your user interface and your business service.

Oracle ADF provides out-of-the-box data control implementations for the most common business service technologies. Using JDeveloper and Oracle ADF together provides you with a drag-and-drop data binding experience as you build your user interfaces. Along with support for ADF application modules, ADF Model also provides support for the following service technologies:

  *  Enterprise JavaBeans (EJB) session beans and JPA entities

  * JavaBeans

  * Web services

  * XML

  * CSV files

Oracle ADF Controller

                                   In the controller layer, where handling page flow of your web application is a key concern, ADF Controller provides an enhanced navigation and state management model on top of JSF.jdeveloper allows you to declarative create task flows where you can pass control between different types of activities such as pages and methods on managed beans, case statements, or calls to another task flows.

Oracle ADF Faces Rich Client

                                 Oracle ADF emphasizes the use of the declarative programming paradigm throughout the development process to allow users to focus on the logic of application creation without having to get into implementation details.

At a high level, the declarative development process for a Fusion web application

Usually involves the following :

 creating an application work space: Using a wizard, JDeveloper automatically adds the libraries and configuration needed for the technologies you select, and structures your application into projects with packages and directories.

Modeling the database objects: You can create an offline replica of any database, and use JDeveloper editors and diagrammers to edit definitions and update schema's.

 1. Creating use cases: Using the UML modeler, you can create use cases for your application.

 2. Designing application control and navigation: You use diagra-mmers to visually determine the flow of application control and navigation. JDeveloper creates the underlying XML for you.

3. Identifying shared resources: You use a resource library that allows you to view and use imported libraries by simply dragging and dropping them into your application.

4. Creating business components to access data: From your database tables, you create entity objects using wizards or dialogs. From those entity objects, you create the view objects used by the pages in your application. You can implement validation rules and other types of business logic using editors.

5. Implementing the user interface with JSF: JDeveloper’s Data Controls panel contains a representation of the view objects for your application. Creating a user interface is as simple as dragging an object onto a page and selecting the UI component you want to display the underlying data. For UI components that are not data bound, you use the Component Palette to drag and drop components.

JDeveloper creates all the page code for you.

1.  Binding UI components to data using the ADF Model layer: When you drag an object from the Data Controls panel, JDeveloper automatically creates the bindings between the page and the data model.

2. Incorporating validation and error handling: Once your application is created you use editors to add additional validation and to define error handling.

 3. Securing the application: You use editors to create roles and populate these with test users. You then use a flat file editor to define security policies for these roles and assign them to specific resources in your application.

 5. Testing and debugging: JDeveloper includes an integrated application server that allows you to fully test your application without needing to package it up and deploy it. JDeveloper also includes the ADF Declarative Debugger, a tool that allows you to set breakpoints and examine the data.

6.  Deploying the application: You use wizards and editors to create and edit deployment descriptors, JAR files, and application server connections.

Oracle ADF 11g & JDeveloper Business Components

Oracle ADF 11g & J Developer MVC Architecture

Oracle ADF 11g Real Time Scenario's & Examples

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