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how to implement a call back service?

Former Member

‎2007 May 14 8:01 AM

0 Likes
437

hi all,

i have a method which calls a particular function module. i want to achieve the following two things in the code:

1. after calling the function module, i want the program flow to get paused - it should wait for a notification from the function module to proceed further.

2. the function module should send a call back to the method intimating that it is done with the job.

due to the scenario, synchronous call wil not solve the purpose. i need to use explicit wait and notificaion / call back service.

any help would be greatly appreciated. thank you.

rgds,

ram

hi all,

i have a method which calls a particular function module. i want to achieve the following two things in the code:

1. after calling the function module, i want the program flow to get paused - it should wait for a notification from the function module to proceed further.

2. the function module should send a call back to the method intimating that it is done with the job.

due to the scenario, synchronous call wil not solve the purpose. i need to use explicit wait and notificaion / call back service.

any help would be greatly appreciated. thank you.

rgds,

ram

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1 REPLY 1
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Former Member

‎2007 Jun 15 7:15 PM

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408

Hello. Have you taken a look at CALL FUNCTION ... STARTING NEW TASK ...

See example below. Regards, Peter

DATA: INFO LIKE RFCSI,

  • Result of RFC_SYSTEM_INFO function

SEMAPHORE(1) VALUE SPACE, "For WAIT condition

MSG(80) VALUE SPACE. "Handling of exceptions

RET_SUBRC LIKE SY-SUBRC. "Handling of SUBRC

CALL FUNCTION 'RFC_SYSTEM_INFO'

STARTING NEW TASK 'INFO'

DESTINATION 'NONE'

PERFORMING RETURN_INFO ON END OF TASK

EXCEPTIONS

COMMUNICATION_FAILURE = 1 MESSAGE MSG

SYSTEM_FAILURE = 2 MESSAGE MSG.

IF SY-SUBRC = 0.

WRITE: 'Wait for reply'.

WAIT UNTIL SEMAPHORE = 'X'.

IF RET_SUBRC <> 0.

WRITE MSG.

ELSE.

WRITE: / 'Destination =', INFO-RFCDEST.

ENDIF.

ELSE.

WRITE MSG.

ENDIF.

...

FORM RETURN_INFO USING TASKNAME.

RECEIVE RESULTS FROM FUNCTION 'RFC_SYSTEM_INFO'

IMPORTING RFCSI_EXPORT = INFO

EXCEPTIONS

COMMUNICATION_FAILURE = 1 MESSAGE MSG

SYSTEM_FAILURE = 2 MESSAGE MSG.

RET_SUBRC = SY-SUBRC. "Set RET_SUBRC

SEMAPHORE = 'X'. "Reset semaphore

ENDFORM.