Data Interfaces

Asynchronous RFC: Parallel Processes
© SAP AG
PROGRAM PARAL01.
...
CALL FUNCTION 'A'
DESTINATION '1'
STARTING NEW TASK 'A'
PERFORMING 'BACK' ON END OF TASK.
CALL FUNCTION 'B'
DESTINATION '2'
STARTING NEW TASK 'B'
PERFORMING 'BACK' ON END OF TASK.
...
FORM BACK USING TASK.
CASE TASK.
WHEN 'A'. ... AFLAG = 'X'.
WHEN 'B'. ... BFLAG = 'X'.
ENDCASE.
SET USER-COMMAND 'CHECK'.
ENDFORM.
AT USER-COMMAND.
CASE SY-UCOMM.
WHEN 'CHECK'.
IF AFLAG = 'X' AND BFLAG = 'X'.
...
By starting several RFCs with STARTING NEW TASK, you can roll out calculations to other servers
(with distributed systems) or systems, or run them in parallel.
If you have to wait for the result of some or all called function modules, you can control this in the list
environment via the event AT USER-COMMAND by setting flags.
Note:
You can perform the same action in a dialog chain (screen sequence) without using SET USER-
COMMAND to trigger the AT USER-COMMAND list event. Please note that the function modules
first run separate from the client program. You do not know when the individual function modules have
finished or, consequently, when the relevant FORM routine is internally triggered. The processing of the
FORM routine is inserted into the current PAI event of the client program. PAI is then processed again
from the beginning.