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Creating a Task Flow
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FIGure 13-2. Create Task Flow dialog
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Task Flow Types
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When building task flows there are two flavors of task flow: bounded and unbounded. If you select Create as Bounded Task Flow, JDeveloper creates a bounded task flow; JDeveloper creates an unbounded task flow if you do not select that check box. An application typically consists of one unbounded task flow and many bounded task flows, and fundamentally, both types of task flow do the same job aside from some slight differences.
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unbounded Task Flow
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You can think of an unbounded task flow as the parent task flow from which your application is launched. With an unbounded task flow, any of the pages within the task flow can be the starting page of the application. If you want to have only one entry point into your application, such as always starting at the Customers page, then your unbounded task flow would contain only one page. If another page could be a starting point of the application, or is accessible from a bookmark or URL, then it would also appear in the unbounded task flow. Typically, an unbounded task flow contains any page that can launch the application, and that page would reference further bounded task flows.
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Bounded Task Flow
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The bounded task flow is the task flow with which you will be working most often and represents a reusable application flow that can be referenced from any other task flow, whether bounded or unbounded. A bounded task flow has a single entry point and zero or more exit points. You can think of a bounded task flow as being similar to a subroutine call in a programming language: it can be called from different places but has only one entry point, it can be parameterized, and it can have multiple return points within its processing flow.
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Building Application Flow
There are some other differences between bounded and unbounded task flows, which you will discover as you learn more about task flows, but for now you can think of the unbounded task flow as the top-level definition of your application flow, with calls to one or many bounded task flows.
Task Flow Diagram
Having created a task flow, you can then define the pages, called view activities, and the navigation between these view activities, called control flows, that characterizes that task flow. To do this, you will be working with the task flow diagram tool and dragging and dropping either pages or other task flows from the Application Navigator; or dragging and dropping task flow components from the Component Palette.
NOTe Just like other artifacts in Oracle ADF, a task flow definition is simply an XML file. Feel free to view the source of the task flow to see the information created as you drag and drop onto the task flow. Let s take a look at how you might create a typical task flow as shown earlier in Figure 13-1.
View Activity
A view activity represents a page within a task flow. You can either drag an existing page directly from the Application Navigator or create a placeholder for a page by dragging a view activity from the Component Palette. When you drag a view activity from the Component Palette, a warning icon within the view activity alerts you to the fact that a page is not yet associated with this placeholder view activity.
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Having created a new view activity, there are a number of different ways to associate it with a page. If a page does not yet exist, then double-click the view activity to launch the Create JSF Page dialog. If a page already exists, then you can either drag it from the Application Navigator onto a view activity or select a page into the Page property of the view activity. Typically, a view activity will have the same name as the page it represents, but that is not a requirement. The view activity properties Activity ID and Page define the name of the view activity and the page it references. By decoupling the navigation from the page name, it means not only that changes to the physical page name will not break the navigation, but also that a page can be reused in several contexts. NOTe If you are creating a bounded task flow, you may notice one of the view activities has a green halo. This indicates that this is the default activity, meaning it is the starting point for the bounded task flow. There is a button on the task flow diagram tool that allows you to change the default activity. You can also right-click the view activity and select Mark Activity | Default Activity.
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