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| MSgID and CorrID |
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| nik_iway |
 Posted: Thu Oct 20, 2005 8:40 pm Post subject: MSgID and CorrID |
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Centurion
Joined: 21 Jul 2005
Posts: 115
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Hi everybody,
I am doing a request reply scenario where i need to i dentify a valid reply for a specific request.
i am issuing my MQPUT on the client side by specifying
COMPUTE MQPMO-OPTIONS = MQPMO-NO-SYNCPOINT + MQPMO-FAIL-IF-QUIESCING.
MOVE WS-INPUT-Q TO MQMD-REPLYTOQ.
MOVE WS-INPUT-Q TO MQMD-MSGTYPE.
CALL 'MQPUT' USING CON-HANDLE
OPO-Q-HANDLE
MQMD
MQPMO
OUTPUT-BUFFER-LENGTH
WS-OUTPUT-BUFFER
COMP-CODE
REASON-CODE.
MOVE 'MQPUT' TO PRT-COMMAND.
MOVE COMP-CODE TO PRT-COMP-CODE.
MOVE REASON-CODE TO PRT-REASON-CODE.
ACCEPT PRT-LOG-TIME FROM TIME.
MOVE PRT-LOG-MESSAGE TO WS-PRINT-LINE.
PERFORM 8000-PRINT-LINE.
MQ-PUT-EXIT.
EXIT.
i wait for the reply in reply to queue
i issue the following MQGET call
MOVE MQMI-NONE TO MQMD-MSGID.
MOVE MQCI-NONE TO MQMD-CORRELID
COMPUTE MQGMO-OPTIONS = MQGMO-WAIT +
MQGMO-ACCEPT-TRUNCATED-MSG +
MQMO_MATCH_CORREL_ID +
MQGMO-NO-SYNCPOINT +
MQGMO-FAIL-IF-QUIESCING
On the SERVER sidde
i create a variable and pass the incoming MQMD message-ID to that variable in the Working storage area
SAVED-MSGID PIC X(24).
and after the MQGET i pass the MQMD-MEssage ID into SAVED-MSGID
MQ-GET SECTION.
MOVE MQMI-NONE TO MQMD-MSGID.
MOVE MQCI-NONE TO MQMD-CORRELID.
*
COMPUTE MQGMO-OPTIONS = MQGMO-WAIT +
MQGMO-ACCEPT-TRUNCATED-MSG +
MQGMO-NO-SYNCPOINT +
MQGMO-FAIL-IF-QUIESCING.
* Wait up to 30 seconds.
MOVE 30000 TO MQGMO-WAITINTERVAL.
*
CALL 'MQGET' USING CON-HANDLE
OPI-Q-HANDLE
MQMD
MQGMO
INPUT-BUFFER-LENGTH
WS-OUTPUT-BUFFER
RETURNED-LENGTH
COMP-CODE
REASON-CODE.
*
MOVE 'MQGET' TO PRT-COMMAND.
MOVE COMP-CODE TO PRT-COMP-CODE.
MOVE REASON-CODE TO PRT-REASON-CODE.
ACCEPT PRT-LOG-TIME FROM TIME.
MOVE PRT-LOG-MESSAGE TO WS-PRINT-LINE.
PERFORM 8000-PRINT-LINE.
4500-MQ-GET-EXIT.
EXIT.
MOVE MQMD-MSGID TO SAVED-MSGID.
before the the MQPUT operation i moved the SAVED-MSGID into the MQMD-CORRELATION ID
MOVE SAVED-MSGID TO MQMD-CORRELID
and do the MQPUT with the following operations
4000-MQ-PUT SECTION.
COMPUTE MQPMO-OPTIONS = MQPMO-NO-SYNCPOINT +
MQPMO-FAIL-IF-QUIESCING.
MOVE MQMT-REPLY TO MQMD-MSGTYPE.
*
CALL 'MQPUT' USING CON-HANDLE
OPO-Q-HANDLE
MQMD
MQPMO
OUTPUT-BUFFER-LENGTH
WS-OUTPUT-BUFFER
COMP-CODE
REASON-CODE.
*
MOVE 'MQPUT' TO PRT-COMMAND.
MOVE COMP-CODE TO PRT-COMP-CODE.
MOVE REASON-CODE TO PRT-REASON-CODE.
ACCEPT PRT-LOG-TIME FROM TIME.
MOVE PRT-LOG-MESSAGE TO WS-PRINT-LINE.
PERFORM 8000-PRINT-LINE.
4000-MQ-PUT-EXIT.
EXIT
i am a learner and i am using of the examples given by the capitalware. Can anybody tell me if ther are any mistakes in my code and wat does it mean by
MOVE MQMI-NONE TO MQMD-MSGID.
MOVE MQCI-NONE TO MQMD-CORRELID.
Waiting for your reply
Thanking you |
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| EddieA |
| Posted: Thu Oct 20, 2005 9:19 pm Post subject: |
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Jedi
Joined: 28 Jun 2001
Posts: 2453
Location: Los Angeles
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The way you have explained things, it's difficult to follow what code is from the client and what is the server. Anyway, some observations:
| Quote: |
| MOVE WS-INPUT-Q TO MQMD-MSGTYPE. |
A queue name is not a message type.
| Quote: |
MOVE MQMI-NONE TO MQMD-MSGID.
MOVE MQCI-NONE TO MQMD-CORRELID
COMPUTE MQGMO-OPTIONS = MQGMO-WAIT +
MQGMO-ACCEPT-TRUNCATED-MSG +
MQMO_MATCH_CORREL_ID +
MQGMO-NO-SYNCPOINT +
MQGMO-FAIL-IF-QUIESCING |
You are asking the GET to match on a CorrelationID, but by using MQCI_NONE, you are saying that any CorrelationID will match.
| Quote: |
wat does it mean by
MOVE MQMI-NONE TO MQMD-MSGID.
MOVE MQCI-NONE TO MQMD-CORRELID |
For a PUT, it means you want the Queue Manager to generate a MessagID for you, and you don't want a CorrelationID set.
For a GET, it means that you want to read the next message off the queue, no matter what it's MesageID and CorrelationID are..
The normal pattern for a Client, is before the PUT, you set MessageID and CorrelationID to NONE. After the PUT, you extract the MessageID that MQ has filled in for you. You then issue a GET with Wait, setting the MessageID to NONE and the CorrelationID to the MesageID you just captured. That way, you will only GET a message that matches.
For the Server, you always GET with MesageID and CorrelationID set to NONE. That way you always get every message. Before sending the reply, you move the incoming MessageID into CorelationID, and then set MessageID to NONE. That way the Client will be able to identify the message.
And after every MQ operation, you should check the Completion/Return codes.
Cheers,
_________________
Eddie Atherton
IBM Certified Solution Developer - WebSphere Message Broker V6.1
IBM Certified Solution Developer - WebSphere Message Broker V7.0 |
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| nik_iway |
| Posted: Thu Oct 20, 2005 9:37 pm Post subject: Thanks EddieA |
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Centurion
Joined: 21 Jul 2005
Posts: 115
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EddieA :
After the PUT, you extract the MessageID that MQ has filled in for you
How do we extract the Message ID that MQ has filled? |
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| EddieA |
| Posted: Thu Oct 20, 2005 10:20 pm Post subject: |
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Jedi
Joined: 28 Jun 2001
Posts: 2453
Location: Los Angeles
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| Quote: |
| How do we extract the Message ID that MQ has filled |
MOVE MQMD-MSGID TO ... 
Cheers,
_________________
Eddie Atherton
IBM Certified Solution Developer - WebSphere Message Broker V6.1
IBM Certified Solution Developer - WebSphere Message Broker V7.0 |
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