IBM SC33-1683-02 - Manual (Page 311)

Table 13 describes each stage of the interface between the task-related user exit
and EDF, relating the descriptions to the (T
n) and (En) expressions in Figure 10.
Table 13. Description of each stage of the task-related user exit/EDF interface
Invocation Description
(T1) Task-related user exit invoked to set up its EDF requirements. At this
stage the task-related user exit prepares the “About to Execute” screen
based on the application request.
(E1) Using information passed back from the task-related user exit at
invocation T1, the task-related user exit interface invokes EDF to display
the “About to Execute” screen. EDF sets up the EDF user response, for
example, if the user has changed the screen.
(T2) Task-related user exit is invoked with the EDF user response to the
“About to Execute” screen.
(T3) Task-related user exit invoked to access external resource manager for
application request.
(T4) Task-related user exit invoked to prepare a “Command Execution
Complete” screen, based on the result of the application request.
(E2) Using information passed back from the task-related user exit at
invocation T4, the task-related user exit interface invokes EDF to display
the “Command Execution Complete” screen. EDF sets up the EDF user
response, for example, if the user has changed the screen.
(T5) Task-related user exit is invoked with the EDF user response to the
“Command Execution Complete” screen.
Task-related user
exit interface
Task-related user exit (T1)
Prepare 'About to Execute' EDF screen
EDF (E1)
Display screen
Task-related user exit (T2)
Response EDF user
Task-related user exit (T3)
Access resource manager
Task-related user exit (T4)
Prepare 'Command Execution Complete' EDF screen
EDF (E2)
Display screen
Task-related user exit (T5)
Response EDF user
Figure 10. Interface between the task-related user exit and EDF
the task-related user exit program
Chapter 2. Task-related user exit programs 279