问题
Please help me in understanding the two of these task flows - Bounded and Unbounded in ADF. From what i read from a book, my understanding is that an unbounded taskflow can contain n number of bounded task flows. Please give me example like for what reason we can use unbounded task flows and bounded task flows.
回答1:
Taskflow is something which acts as controller for an ADF application. It is used to define the navigation between taskflows or pages.
In ADF Taskflow is of two types.
- Bounded TF
Unbounded TF
- You can secure a Bounded TF, But unbounded TF you can't.
- You can pass parameters and get parameters to and from a bounded taskflow, but for Unbounded TF you can't.
- Bounded TF has only single entry point, known as default activity, but in unbounded TF multiple entry points are there.
- You can call a bounded TF from another bounded/Unbounded TF, but for unbounded TF, you can't.
- Bounded TF supports transaction, but unbounded TF doesn't.
See whenever you want your page not to be secured you can use unbounded TF. For example, consider a online shopping application. In the application pages like Home, About Us, Products will be in an unbounded TF. But seeing your order history, wishlist will come under bounded TF.
回答2:
ADF bounded taskflow is used to encapsulate a reusable portion of an application :
- Has a single entry point
- May accept input parameters
- May generate return values
- Has its own collection of activities and control flow rules
- Has its own memory scope and managed bean lifespan (a page flow scope instance)
You typically use the unbounded task flow instead of a bounded task flow if:
- You want to take advantage of ADF Controller features not offered by bounded task flows, such as bookmarkable view activities.
- The task flow will not be called by another task flow.
来源：https://stackoverflow.com/questions/25334674/bounded-task-flow-versus-unbounded-taskflow-in-adf