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How to Receive a Message from an Apache ActiveMQ Queue with GNU COBOL

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ACTIVEMQSAMPLE.cbl

IDENTIFICATION DIVISION.

PROGRAM-ID. ACTIVEMQSAMPLE.

ENVIRONMENT DIVISION.

CONFIGURATION SECTION.

DATA DIVISION.

WORKING-STORAGE SECTION.

COPY EZADATA.

PROCEDURE DIVISION.

PERFORM EZA-INITAPI.

PERFORM EZA-SOCKET.

MOVE 61613 TO EZA-NAME-PORT.

PERFORM EZA-CONNECT.

MOVE 'CONNECT' & X'0A' & X'0A' & X'00' TO EZA-BUFFER.

MOVE 10 TO EZA-NBYTE.

PERFORM EZA-SEND.

MOVE 1000 TO EZA-NBYTE.

PERFORM EZA-RECV. *> Skip the CONNECTED frame

MOVE 'SUBSCRIBE' & X'0A' & 'destination:SampleQueue' & X'0A' & 'ack:auto' & X'0A' & X'0A' & X'00' TO EZA-BUFFER.

MOVE 45 TO EZA-NBYTE.

PERFORM EZA-SEND.

MOVE 1000 TO EZA-NBYTE.

PERFORM EZA-RECV.

MOVE 'DISCONNECT' & X'0A' & X'0A' & X'00' TO EZA-BUFFER.

MOVE 13 TO EZA-NBYTE.

PERFORM EZA-SEND.

PERFORM EZA-CLOSE.

PERFORM EZA-TERMAPI.

GOBACK.

COPY INITAPI.

COPY SOCKET.

COPY CONNECT.

COPY SEND.

COPY RECV.

COPY CLOSE.

COPY TERMAPI.

EZADATA.cpy

01 EZA-CALL-DATA.
  05 EZA-FUNCTION PIC X(16).
  05 EZA-AF PIC S9(9) COMP.
  05 EZA-BACKLOG PIC S9(9) COMP.
  05 EZA-CLIENT.
    10 EZA-CLIENT-DOMAIN PIC S9(9) COMP.
    10 EZA-CLIENT-NAME PIC X(8).
    10 EZA-CLIENT-TASK PIC X(8).
    10 FILLER PIC X(20).
  05 EZA-COMMAND-X.
    10 EZA-COMMAND PIC S9(9) COMP.
  05 EZA-FLAGS PIC S9(9) COMP.
  05 EZA-HOSTADDR PIC X(4).
  05 EZA-HOSTENT POINTER.
  05 EZA-HOW PIC S9(9) COMP.
  05 EZA-IDENT.
    10 EZA-IDENT-TCPNAME.
        15 EZA-IDENT-TAG PIC X(6).
        15 EZA-IDENT-SYSID PIC X(2).
    10 EZA-IDENT-ADSNAME PIC X(8).
  05 EZA-MAXSNO PIC S9(9) COMP.
  05 EZA-MAXSOC PIC S9(4) COMP.
  05 EZA-MAXSOC-SELECT PIC S9(9) COMP.
  05 EZA-NAME.
    10 EZA-NAME-FAMILY PIC S9(4) COMP.
    10 EZA-NAME-PORT PIC 9(4) COMP.
    10 EZA-NAME-IPADDRESS PIC X(4).
    10 FILLER PIC X(8).
  05 EZA-NAMELEN PIC S9(8) COMP.
  05 EZA-NBYTE PIC S9(9) COMP.
  05 EZA-OPTLEN PIC S9(9) COMP.
  05 EZA-OPTNAME PIC S9(9) COMP.
  05 EZA-OPTVALUE PIC X(16).
  05 EZA-PROTO PIC S9(9) COMP.
  05 EZA-RETCODE PIC S9(9) COMP.
  05 EZA-S-X.
    10 EZA-S PIC S9(4) COMP.
    10 EZA-S-ACCEPT PIC S9(4) COMP.
  05 EZA-SOCRECV PIC S9(4) COMP.
  05 EZA-SOCTYPE PIC S9(9) COMP.
    88 EZA-SOCTYPE-STREAM VALUE +1.
    88 EZA-SOCTYPE-DATAGRAM VALUE +2.
  05 EZA-SUBTASK PIC X(8).
  05 EZA-TIMEOUT.
    10 EZA-TIMEOUT-SECONDS PIC S9(9) COMP.
    10 EZA-TIMEOUT-MICROS PIC S9(9) COMP.
  05 EZA-NAME-STR PIC X(255).
  05 EZA-PROGRAM PIC X(8).
  05 EZA-IOVCNT PIC 9(8) COMP.
  05 EZA-ERRNO PIC S9(9) COMP.
    88 EZA-ERRNO-EAFNOSUPPORT VALUE 97.
    88 EZA-ERRNO-ENAMETOOLONG VALUE 36.
    88 EZA-ERRNO-EINVAL VALUE 22.
    88 EZA-ERRNO-EPROTOTYPE VALUE 91.
    88 EZA-ERRNO-EACCES VALUE 13.
    88 EZA-ERRNO-EADDRINUSE VALUE 98.
    88 EZA-ERRNO-ENOTSOCK VALUE 88.
    88 EZA-ERRNO-EADDRNOTAVAIL VALUE 99.
    88 EZA-ERRNO-EBADF VALUE 9.
    88 EZA-ERRNO-EOPNOTSUPP VALUE 95.
    88 EZA-ERRNO-ECONNREFUSED VALUE 111.
    88 EZA-ERRNO-EISCONN VALUE 106.
    88 EZA-ERRNO-ENETUNREACH VALUE 101.
    88 EZA-ERRNO-EPROTONOSUPPORT VALUE 93.
    88 EZA-ERRNO-EAGAIN VALUE 11.

01 EZA-BUFFER PIC X(1000).

01 EZA-IOV.
  03 EZA-IOV-ENTRY OCCURS 4 TIMES.
    05 EZA-IOV-BUFFER USAGE IS POINTER.
    05 EZA-IOV-RESERVED PIC X(4).
    05 EZA-IOV-BUFFER-LEN PIC 9(8) COMP.

01 EZA-MSG.
  05 EZA-MSG-NAME USAGE IS POINTER.
  05 EZA-MSG-NAMELENGTH USAGE IS POINTER.
  05 EZA-MSG-IOV USAGE IS POINTER.
  05 EZA-MSG-IOVCNT USAGE IS POINTER.
  05 EZA-MSG-ACCRIGHTS USAGE IS POINTER.
  05 EZA-MSG-ACCRLEN USAGE IS POINTER.

01 ABEND-INFORMATION.
  05 ABEND-CODE PIC 9(4) VALUE ZEROS.

INITAPI.cpy

EZA-INITAPI SECTION.
  MOVE 'INITAPI' TO EZA-FUNCTION.

  CALL 'EZASOKET' USING EZA-FUNCTION EZA-MAXSOC EZA-IDENT EZA-SUBTASK EZA-MAXSNO EZA-ERRNO EZA-RETCODE.

SOCKET.cpy

EZA-SOCKET SECTION.
  MOVE 'SOCKET' TO EZA-FUNCTION.

  MOVE 2 TO EZA-AF. *> IPV4

  MOVE 1 TO EZA-SOCTYPE. *> TCP

  CALL 'EZASOKET' USING EZA-FUNCTION EZA-AF EZA-SOCTYPE EZA-PROTO EZA-ERRNO EZA-RETCODE.

  MOVE EZA-RETCODE TO EZA-S.

CONNECT.cpy

EZA-CONNECT SECTION.
  MOVE 'CONNECT' TO EZA-FUNCTION.

  MOVE 2 TO EZA-NAME-FAMILY. *> IPV4

  MOVE LOW-VALUES TO EZA-NAME-IPADDRESS. *> NULL

  CALL 'EZASOKET' USING EZA-FUNCTION EZA-S EZA-NAME EZA-ERRNO EZA-RETCODE.

  MOVE EZA-S TO EZA-S-ACCEPT.

SEND.cpy

EZA-SEND SECTION.
  MOVE 'SEND' TO EZA-FUNCTION.

  CALL 'EZASOKET' USING EZA-FUNCTION EZA-S-ACCEPT EZA-FLAGS EZA-NBYTE EZA-BUFFER EZA-ERRNO EZA-RETCODE.

RECV.cpy

EZA-RECV SECTION.
  MOVE 'RECV' TO EZA-FUNCTION

  CALL 'EZASOKET' USING EZA-FUNCTION EZA-S-ACCEPT EZA-FLAGS EZA-NBYTE EZA-BUFFER EZA-ERRNO EZA-RETCODE

CLOSE.cpy

EZA-CLOSE SECTION.
  MOVE 'CLOSE' TO EZA-FUNCTION

  CALL 'EZASOKET' USING EZA-FUNCTION EZA-S-ACCEPT EZA-ERRNO EZA-RETCODE.

TERMAPI.cpy

EZA-TERMAPI SECTION.
  MOVE 'TERMAPI' TO EZA-FUNCTION.

  CALL 'EZASOKET' USING EZA-FUNCTION.

Posted by:

Fernando Ribeiro

Experienced tech executive with a 24-year track record in enterprise computing. Leading AWS’s professional services application modernization division in Brazil. He’s held diverse roles including management, solutions architecture, sales consultancy, and full-stack development at major players like Oracle, Red Hat, and IBM. Fernando also contributes to open source and writes about emerging technologies. The views expressed here are his own and do not necessarily reflect the views of AWS.

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How to Receive a Message from an Apache ActiveMQ Queue with GNU COBOL

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