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Oracle ADF is based around the architectural principle of Model-View-Controller (MVC). What that means is that the framework separates the implementation of the business services (Model) from the implementation of the user interface (View), with the Controller managing application flow.
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Quick Start Guide to Oracle Fusion Development
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Having distinct and separate layers has a number of advantages, such as promoting reuse and testing independence.
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The role of the Model is to implement the business service or data model. In most cases (and the primary use case for this book) a business service will involve the querying and manipulation of data from a relational database. This requires the Model layer to provide a number of functions.
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Object-Relational Mapping Given that a Fusion application is built in an object-oriented Java environment and that the data is sitting in a relational database, a mapping must occur between these two different worlds. Often called O/R mapping, the Model is responsible for mapping a Customer Java object that lives in the application to the underlying Customer table in the relational database. Default Operations With a business service based on a database table, the chances are you
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will want to perform actions on that data, such as query, delete, insert, next record, previous record, commit, and rollback actions. It is therefore reasonable to expect that the Model will provide common functions to manipulate the data represented in the business service.
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Validation For a business service, you probably want to validate the data to ensure that it meets specific business and data requirements. For example, you need to enforce business rules such as not allowing a customer record to be created without first specifying the customer name, or not allowing a customer s credit limit to be more than $4000.
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The role of the View is to expose the business service to the end user, typically through a browser. Some of the high-level features of the View layer are described next.
UI Component Set The principal goal of the View is to provide a set of rich UI components. These components range from the familiar buttons, check boxes, and text fields, to richer components like tree hierarchies and data tables, and also layout components to help position content on the page. Adaptive Rendering A UI component should be able to render itself correctly regardless of the target device. For example, it should render correctly whether it s on one of several different browsers or on a mobile device like a cell phone. Programming Model The View should be responsible for providing infrastructure for allowing
UI-specific code to be associated with a page.
Look and Feel
The capability to define corporate templates and application skins is a core feature of the View. For example, you can build an application for different customers that enables each customer to choose their own look and feel.
Controller
The final building block of MVC is the Controller. The Controller is responsible for event handling and determining page navigation. Some broad requirements of the Controller are described next.
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Task Flow For an application that contains many pages, you would want to be able to define if I am on this page, then when this action happens, I want to navigate to this new page. The Controller allows you to define this application page flow. However, you may also want to implement a case such as if I am on this page, then when this action happens, I want to perform some particular task first, and then navigate to the new page. This extended use case, called task flow, goes beyond page flow to include the calling of business actions. Reuse Given that a typical application could involve hundreds of pages, the Controller should
allow subsets of application flow to be built and then reused within the main application flow whenever needed. For example, a login task flow might involve a specific flow of pages that can be reused throughout the application.
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