Saturday, August 10, 2013

Samle Remote stored procedure in CICS/Cobol (RSP)

A Typical RSP Structure
  (check the CICS link for more informtion on RSP)
LINKAGE SECTION.
01 DFHCOMMAREA.
COPY SPAREAC.
01 LK-INPUT-PIPE                    PIC X(100).

01 LK-RETURN-PIPE.
   05 LK-RPLY-SEND-AREA             PIC X(200).

PROCEDURE DIVISION.

PERFORM OPEN-INPUT-PIPE   THRU OPEN-EXIT
PERFORM GET-INPUT-PARM    THRU GET-INPUT-EXIT
PERFORM OPEN-OUTPUT-PIPE  THRU OPEN-OUTPUT-EXIT
PERFORM PROCESS-DATA      THRU PROCESS-EXIT
PERFORM CLOSE-PIPE        THRU CLOSE-EXIT
PERFORM FREE-STORAGE      THRU FREE-EXIT
PERFORM RETURN-TO-FRONT-END.

OPEN-INPUT-PIPE.
MOVE 'OUTPUT'    TO SPMODE.
MOVE 'STD'       TO SPFORMAT.
MOVE  200        TO SPMAXLEN.

CALL 'OPENPIPE' USING SPAREA.
IF SPRC NOT = '000'
MOVE 'OPEN PIPE ERROR IN DRIVER' TO SPMSG
PERFORM PIPE-ERR-RTN  THRU PIPE-EXIT
END-IF.


GET-INPUT-PARM
IF SPVARLEN > 0
   SET ADDRESS OF LK-INPUT-PIPE TO SPVARTXT
   MOVE LK-INPUT-PIPE           TO WS-INPUT-AREA

ELSE
PEROFRM-ERROR-PARA
END-IF.

OPEN-OUTPUT-PIPE.

EXEC CICS GETMAIN
SET (ADDRESS OF LK-RETURN-PIPE)
LENGTH(200)
INITIMG(WS-INITIMG)
RESP (WS-RESP)
END-EXEC


IF WS-RESP = DFHRESP (LENGERR)
MOVE 'CICS LENGTH ERROR IN RETURN AREA'
                                      TO LK-ERR-DESC
END-IF.


PROCESS-DATA
...... PROCESS THE DATA LIKE UPDATE/FETCH WHCH WE GOT FROM FRONT-END
 THRU LINKAGE SECTION INTO OUR WS-VARIABLES.
 PERFORM RESULT-LINKAGE-OUTPUT

RESULT-LINKAGE-OUTPUT
  MOVE WS-OUTPUT-AREA   TO LK-RPLY-SEND-AREA
  SET SPFROM TO ADDRESS OF LK-RETURN-PIPE
  PERFORM PUT-PIPE      THRU EXIT.


PUT-PIPE.
CALL 'PUTPIPE' USING SPAREA.
IF SPRC NOT = '000'
   MOVE 'PUT-PIPE ERROR ' TO SPMSG
   PERFORM PIPE-ERR-RTN
END-IF.


CLOSE-PIPE
CALL 'CLOSPIPE' USING  SPAREA.
IF  SPRC  NOT = '000'
    MOVE  'CLOSE-PIPE ERROR' TO  SPMSG
END-IF.
MOVE  'OK'   TO SPSTATUS
CALL  'STATUS'  USING SPAREA.


FREE-STORAGE.
EXEC CICS FREEMAIN
     DATA (LK-RETURN-PIPE)
END-EXEC


RETURN-TO-FRONT-END.
EXEC CICS 

     RETURN
END-EXEC.


Explanation:
First we need to include SPAREAC in LINKAGE SECTION. SPAREAC includes all pointers,codes that the RSP needs to exchange the data with the front end via the Direct connect.It sets the pointer to the communication channel.
CICS put pipe error might come if the pipe is opened properly .Also if the middleware( like Direct connect or somthing) server is down, CICS program can give put pipe error. So we need to initialize the storage pipes properly and  remove the put pipe,get pipe error.
(For further clarifications leave ur questions in comments section..)
Structure of SPAREAC::::
STORED PROCEDURE COMMUNICATION AREA
03    SPAREA.
05    SPHEADER    PIC X(8).
05    SPRESRVD    PIC X(33).
05    SPTRCOPT    PIC X(1).
05    SPSTATUS    PIC X(2).
05    SPCODE    PIC X(8).
05    SPFORMAT    PIC X(3).
05    SPMODE    PIC X(6).
05    SPRC    PIC X(3).
05    SPFROM    USAGE IS POINTER.
05    SPINTO    REDEFINES SPFROM USAGE IS POINTER.
05    SPSQLDA    REDEFINES SPINTO USAGE IS POINTER.
05    SPVARTXT    USAGE IS POINTER.
05    SPVARTAB    USAGE IS POINTER.
05    SPROWS    PIC S9(8) COMP.
05    SPMAXLEN    PIC S9(4) COMP.
05    SPRECLEN    REDEFINES SPMAXLEN PIC S9(4) COMP.
05    SPVARLEN    PIC S9(4) COMP.
05    SPPREFIX    PIC X.
05    SPMSG    PIC X(100).
05    FILLER    PIC X(3).
05    SPSQL    USAGE IS POINTER.
05    SPATTACH    PIC X(8).
05    SPUSERID    PIC X(8).
05    SPPWD    PIC X(8).
05    SPCMPOPT    PIC X(1).
05    SPIND    PIC X(1).
05    SPDATE    PIC X(8).
05    SPTIME    PIC X(8).
05    SPCONFIG    PIC X(4).
05    SPSERVER    PIC X(30).
05    FILLER    PIC X(32).


The input pipe is opened for communication.In the GETINPUT para, the pointer is set, so that linkage-varibales get the variables passed from front-end via the SPVARTEXT.Then we bring the variables from  likage to our WS-VARIABLES for processing. Once processing is over, we move the Result from WS-OUTPUT to linkage-output and then on to FRONT-END.

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