Callable object context question

Question

HI All.
1)If i make web dynpro as a callable object then - i have 2 types of context - 1 is the web dynpro context as always and one is the calleble object context (GP Context)
What is the difference between the two contexts?
2)What is achieved when i map the webdynpro context attribute's value  to the attribute of GP Context -ie - what purpose does it serve?
3)Whati if i do not set any attributes in the technical description of the GP Context
Please help me in the above things
Points assured for help

Answer 1

Hi,
1) By GP context I think you mean the input/ouput parameter of the GP CO context. These are defined in the getdescription() method of the Web Dynpro callable object which are exposed in GP as Callable object's parameters. In WDP there is no context node available as GP context. This is defined and operated by code using GP API.
2) The GP context of a WDP CO is what available in GP design time from the callable object as input and output parameters. In the WDP application you may not have any physical context as GP context. Because anyway you have to write code to define, read and write the GP context in the getDescription(), execute() and complete() methods. So you may or may not keep a specific context node in WDP for the GP context. You can read any relevant context node of the WDP and populate the GP context by coding. So no question of mapping physically.
3) if you don't set any attributes in the getDescription() method no input or output parameter will be available in GP from that callable object.
Thanks,
Dipankar