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A common misconception of Oracle ADF is that the functionality is implemented by thousands of lines of Java code automatically generated as a result of stepping through the wizards in JDeveloper. This is definitely not the case. It is true that Oracle ADF itself is implemented in Java; however, the way the framework is configured for a specific application s use case is largely driven by metadata. That means that an application-specific framework use case, such as defining that the application should navigate from page A to page B, is driven by metadata defined in XML, not Java code. At runtime, the generic framework classes read the XML to implement the specific navigation from page A to page B.
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Of course, you might think that XML is just as difficult to maintain as machine-generated Java code; and this is where JDeveloper exploits the full power of Oracle ADF. JDeveloper allows the manipulation of the metadata in a much more intuitive and simplified way. In the case of page navigation, the developer is presented with a page flow visual editor that shows the pages of the applications and how they flow together. As a developer, you are working with a visual representation that closely matches the job at hand. The fact that changing the visual page flow is actually changing an XML file is, generally speaking, something you don t see or need to see. NOTe While JDeveloper presents the editing of the framework metadata through visual diagrams, dialog boxes, and property inspectors, there is nothing to stop you from directly editing the source files as well. Whether you re editing the XML file directly or through one of the more declarative means, the same underlying file is being updated.
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Metadata Advantages
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There are a number of advantages to this metadata-driven approach to the framework beyond the fact that you do not have to maintain masses of generated Java code. First, it helps you to keep a clean separation between the code you write to address an application-specific business problem and the implementation of a framework feature. The metadata implements the directives for driving the framework features, while your application-specific code can reside in its own separate Java classes.
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Quick Start Guide to Oracle Fusion Development
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The second advantage is found at runtime. Because the metadata is read at runtime, and is not compiled at design time, you could conceivably swap in and out different metadata for different deployments without having to recompile all your Java code. Why would you want to do that Well, you might have one set of framework validation rules that is used for some customer deployments but a different set of validation rules that is used for other customers. If these validation rules were in code, this swapping in and out would be more difficult to achieve. NOTe The management of metadata to allow the customization and personalization of an application is handled by a framework feature called Metadata Services (MDS). Although MDS is beyond the scope of this book, it is worth pointing out that this feature exists and is a core element of the Fusion stack for applying customizations to Fusion applications.
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Now that you understand the role of a framework and the high-level architecture of Oracle ADF, the next step is to look at the specific building blocks of Oracle ADF. If you have had the opportunity to use JDeveloper already, you may have noticed the splash screen Productivity with choice. This mantra refers directly to Oracle ADF. Oracle ADF offers a number of different solutions for each of the layers in the MVC architecture. As you can see in Figure 2-1, the View layer offers a choice of technologies for a desktop UI or a browser-based UI. So, how do you choose which technology to use The choice of technology stripe through Oracle ADF could be a chapter in itself, but given that the purpose of this book is a quick start guide to Fusion, we ll focus on the technology stripe used to build the Oracle Fusion Applications. This technology stripe is highlighted in Figure 2-1.
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