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ow that you are starting to build data-bound pages, you need to hook these pages together to provide a complete application. ADF Controller provides the ability to define application flow within reusable modules called task flows.
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In this chapter you will learn about building task flows, discover different flavors of task flow, and gain an insight into some of the common features of task flows.
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Application flow typically involves the user navigating between application pages; however, ADF Controller goes beyond simply the flow of pages to include calls to business methods and features such as the conditional routing of application flow. Each of these definitions of application flow, called task flows, is easily reused, and at runtime the framework is responsible for reading the task flow definitions and implementing the appropriate sequence of pages and processes. Figure 13-1 shows a simple example of a task flow depicting pages, flows between pages, a call to a business method, and a call to another task flow. Typically, each of the flows between pages would be associated with some user action, such as clicking a button on the page.
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FIGure 13-1. Example of a task flow
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The specifics of the task flow diagram are covered later in this chapter, but for now, the task flow in Figure 13-1 can be interpreted in the following way: Customers page. From the Customers page, for an edit action, navigate to the EditCustomer
Customers From the Customers page, for a create action, call a method createCustRecord before navigating to the EditCustomer page. Here the EditCustomer page is being used to enter details for a new customer as well as to edit an existing customer. Customers page. From the Customers page, for an order action, navigate to the ShowOrders
editCustomer On the EditCustomer page, if an action called submit happens, navigate back to the Customers page. ShowOrders On the ShowOrders page, if an action called return happens, navigate back to the Customers page. ShowOrders The ShowOrders page includes an action, maintain, that will call another task flow, maintain-orders-taskflow. maintain-order-taskflow On completing the call to this task flow, control will return to the ShowOrders page via the finished action.
Each task flow is defined in its own file, so the application flow could be, and typically is, split into different task flows. There are a number of benefits in breaking application flow into different task flows, including: the ability to reuse task flows, simplified testing, development independence, and, of course, it just makes the application easier to understand if broken down into functional groups. When it comes to building task flows, there are different approaches you might consider. You might start with a storyboard approach, where for a particular task flow you create placeholders representing pages to be created at a later point and draw control flows between those placeholders. This approach can be useful in allowing developers and end users to visualize the flow of the application before the job of building application pages actually starts. Alternatively, you might create a task flow by assembling existing pages into the task flow. And, of course, you may well take an approach that is a mixture of both. JDeveloper gives you the flexibility to choose whatever way suits your development project.
By default, the ViewController project in an Oracle ADF Fusion Application contains a task flow called adfc-config.xml; however, you can create further task flows by selecting File | New and, from the New Gallery dialog, selecting JSF and then ADF Task Flow. This launches the Create Task Flow dialog, as shown in Figure 13-2. As you can see in Figure 13-2, there are a number of options for creating a task flow, more of which are covered later, but for now, let s address the fact that there are two types of task flow.
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