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Building ADF Business Components
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If you want to change any of this information, such as the order in which the data is retrieved or whether an attribute is updateable, you can do this by setting properties exposed in the ADF Business Components editors. It is these editors that give the developer a productive and declarative way of maintaining the metadata underpinning ADF Business Components. Upon running the business services, either through an application or the built-in ADF Business Components tester, the framework reads the application s XML files to create application-specific instances of the more generic framework classes.
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Of course, one of the key features of ADF Business Components is that the framework classes can themselves be exposed to the developer so that application-specific code can be added to the more generic framework classes. For example, if you decide that the default framework feature for committing a transaction needs some application-specific code added to it, you can get JDeveloper to expose that framework class. This takes the form of JDeveloper creating a subclass of the framework class, into which you can add your own code.
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The Building Blocks of ADF Business Components
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ADF Business Components is itself based on three main building blocks, as shown in Figure 4-1: the entity object, the view object, and the application module. You might be thinking, What, more layers and you would be right; however, each layer of ADF Business Components has a well-defined role, and being separate and distinct makes it much more flexible and powerful. The entity object maps directly to a database table and acts as an application cache for records from that table. The view object defines an application-specific view of records queried into the underlying entity objects. The final building block is a container called an application module, which is a collection of instances of view objects that defines the data model and transaction for a particular business task.
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Customers Customers CustomerOrders AllOrders Orders Employees Application Module with View Object Instances View Objects Entity Objects Customers Orders
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FIGure 4-1. ADF Business Components consists of entity objects, view objects, and application modules.
Quick Start Guide to Oracle Fusion Development
Introduction to entity Objects
When you build an application based on a database table, your application needs somewhere to hold the records brought back from the database. It is the responsibility of the entity object to provide this functionality. As well as providing a data cache, the entity object performs the O/R mapping between the application and the database. For example, a Customers entity object would map to the underlying Customers table in the database. Furthermore, because the entity object is the object in which application data is held and manipulated, it is also the place where business and data validation logic is implemented. For each of the columns in the underlying table, the entity object will typically contain an attribute that maps to that column and reflects its characteristics, like data type, precision, and whether it allows null values. Of course, an entity object doesn t require an attribute to be mapped to every column in the underlying database table. If your application never needs to manipulate, access, or display a particular column from the database, then you can remove the corresponding attribute from the entity object. An entity object can be based on a database table, view, or synonym; however, in this book the primary use case will be an entity object based on a database table, and so you can think of an entity object as being like a local copy of the table inside the application.
Behind the Scenes of an entity Object
The entity object is displayed in the Application Navigator as a single ADF Business Components artifact. Double-click the entity object to edit it in the appropriate editor. You can also expand the node in the Application Navigator to view the entity object implementation files.
The core implementation of an entity object is through a single XML file; for example, Customers.xml in the case of an entity object called Customers. This alone is enough for the framework to provide rich business service functionality based on the Customers table. If you look at the source of the XML file that implements the entity object, you should be able to recognize the information read from the database that is used to implement specific entity object behavior. For example, the CustomerId attribute maps to the CUSTOMER_ID database column, which is a primary key and should be not null.
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