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| JAVA IBM MQ Destructive Read Message from Queue |
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| venkata.silla4u |
 Posted: Tue May 21, 2019 8:23 pm Post subject: JAVA IBM MQ Destructive Read Message from Queue |
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Newbie
Joined: 21 May 2019
Posts: 2
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Hi All,
I m trying to read a message from queue and auto delete the message after successfully reading it i.e., destructive read.Some how i tried all the mq options as mentioned below,Though i m able to successful read the message from CICS output queue, i still see a copy of the read message still remains in the queue.which leads to the queue messages pilling up. Need some help if i'm missing anything here on destructive read.
//defining the mq queue object
MQQueue docRespQObj = queueManagerObj.accessQueue(docResQ, CMQC.MQOO_INQUIRE + CMQC.MQOO_FAIL_IF_QUIESCING + CMQC.MQOO_INPUT_SHARED);
//Code to read message from queue, descructive read is not working here.
MQMessage messageObj = new MQMessage();
mqGMO = new MQGetMessageOptions();
mqGMO.matchOptions = MQConstants.MQMO_MATCH_CORREL_ID;
mqGMO.options = MQConstants.MQGMO_WAIT;
mqGMO.waitInterval = waitInterval;
// wait interval
messageObj.correlationId = correlationId;
long startTime = System.currentTimeMillis();
docRespQObj.get(messageObj, mqGMO);
int payloadLength = messageObj.getMessageLength();
msgPayload = new byte[payloadLength];
messageObj.readFully(msgPayload);
Please advice if i'm missing any GMO or MQ options.Thank you. |
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| PaulClarke |
| Posted: Tue May 21, 2019 10:10 pm Post subject: |
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Grand Master
Joined: 17 Nov 2005
Posts: 1002
Location: New Zealand
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If you don't tell MQ z/OS explicitly whether you want sync-point or not then it will assume that you do want sync-point (ie. in a transaction). Unfortunately Distributed MQ went the other way and assumed no sync-point. So, it is always a good idea to be explicit about whether you want transactions involved.
So, I would suggest you add MQGMO_NO_SYNCPOINT to your MQGMO_WAIT get options,
Cheers,
Paul
_________________
Paul Clarke
MQGem Software
www.mqgem.com |
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| venkata.silla4u |
| Posted: Wed May 22, 2019 3:05 am Post subject: MQ destructive read/get |
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Newbie
Joined: 21 May 2019
Posts: 2
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I tried adding the No SYNCPOINT here, no luck.. still messages are sitting in the READ Queue which was dropped by the CICS program.
mqGMO.matchOptions = MQConstants.MQMO_MATCH_CORREL_ID;
mqGMO.options = MQConstants.MQGMO_WAIT + MQConstants.MQGMO_NO_SYNCPOINT; |
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| Vitor |
| Posted: Wed May 22, 2019 5:03 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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Use a try / catch block to ensure you're getting any errors MQ is throwing when it tries to commit the read.
It's best practice anyway; your code may be solid but any number of external factors can cause problems.
_________________
Honesty is the best policy.
Insanity is the best defence. |
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