Code Snippet Series: Wait a Fraction of a Second
This post is part of a series on code snippets. The complete list of posts in the series is available in the document Code Snippets: A Blog Series.
I occasionally need to wait for a lock entry to be dequeued when I have a multi-step scenario where COMMIT WORK AND WAIT is insufficient but waiting a static number of seconds with WAIT UP TO n SECONDS could result in waiting longer than necessary.
With the below code, I reduce wait time to the shortest possible wait–depending on use, even down to one tenth of a second.
DATA lt_enq TYPE STANDARD TABLE OF seqg3. DATA: BEGIN OF ls_time, start TYPE timestampl, now TYPE timestampl, elapsed TYPE tzntstmpl, " in seconds limit TYPE tzntstmpl VALUE 3, " in seconds END OF ls_time. GET TIME STAMP FIELD ls_time-start. WHILE ls_time-elapsed < ls_time-limit. CALL FUNCTION 'ENQUEUE_READ' EXPORTING gname = TABLE_NAME garg = TABLE_KEY TABLES enq = lt_enq EXCEPTIONS communication_failure = 1 system_failure = 2 OTHERS = 3. IF lt_enq IS INITIAL. EXIT. " object is not locked ENDIF. GET TIME STAMP FIELD ls_time-now. ls_time-elapsed = cl_abap_tstmp=>subtract( tstmp1 = ls_time-now tstmp2 = ls_time-start ). ENDWHILE. " elapsed time