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Building ADF Business Components
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Behind the Scenes of a View Object
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Just like the entity object, the view object is displayed in the Application Navigator as a single ADF Business Components artifact, symbolized by the reading spectacles icon. Double-clicking the view object opens it in its associated editor.
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The view object is essentially a Select statement defined in an XML file, with the view object editor providing a simple and intuitive way of editing information about the view object to build up this Select statement. As well as defining the attributes that make up the view object, you can also define information such as a Where and Order By clause and even edit the Select statement directly if you feel comfortable writing SQL.
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Quick Start Guide to Oracle Fusion Development Optional Java File As with an entity object, you can extend the functionality of the view object by exposing and augmenting the underlying framework classes. You might choose to do this if you wish to implement functionality such as programmatically manipulating the Where clause or creating a custom method that performs some application function on a view of data. This is also covered in more detail in 6.
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Referring back to Figure 4-1, notice that an arrowed line also appears between the view objects. This represents a view link. View links, as the name suggests, link view objects together to implement behavior such as master/detail relationships. For example, suppose you have a view of customers and a view of Orders, but are really only interested in seeing the orders for a selected customer. When the orders view object is linked to the Customers view object with a view link, the framework automatically restricts the view of orders based on the customer. TIp While the view object isn t necessarily driven by the user interface, it can be a useful way of conceptualizing which view objects you need and what information they need to encapsulate.
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Introduction to Application Modules
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Having defined application-specific data views through view objects, the final step is to arrange instances of those view objects into a data model for a particular use case. This container of view object instances is called an application module. A typical application will contain one or more application modules, with the application module defining the transaction boundary for committing and rolling back changes made to the views of data contained within it. Application modules can themselves contain other application modules, called nested application modules. This might be useful where a particular use case, as implemented by an application module, is also required within the transaction of a larger use case. The application module can be thought of as a service fa ade or service interface to a consuming client, like a web page, that defines the public actions and data views for a particular application process or use case.
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Behind the Scenes of an Application Module
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The application module is displayed in the Application Navigator as a single ADF Business Components artifact. Double-click it to open the application module editor, where you can see the view objects within the project and can shuttle them over to define your application module. As with the previously described ADF Business Components artifacts, the definition of an application module is through XML; however, the application
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Building ADF Business Components
module editor provides a simple and declarative way of defining the view object instances and methods that make up an application module.
Optional Java File
The framework class that implements the application module functionality already provides methods for committing and rolling back the transaction. However, if you wish to augment that functionality, you can generate the application module implementation class and add your own code to this class. You can also define application module level methods that you want to expose to the consuming client. This is covered in more detail in 7.
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