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MQSeries.net Forum IndexGeneral DiscussionJAVA IBM MQ Destructive Read Message from Queue

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venkata.silla4u
PostPosted: Tue May 21, 2019 8:23 pm Post subject: JAVA IBM MQ Destructive Read Message from Queue Reply with quote

Newbie

Joined: 21 May 2019
Posts: 2

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
PostPosted: Tue May 21, 2019 10:10 pm Post subject: Reply with quote

Guardian

Joined: 17 Nov 2005
Posts: 938
Location: New Zealand

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
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Paul Clarke
MQGem Software
www.mqgem.com
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venkata.silla4u
PostPosted: Wed May 22, 2019 3:05 am Post subject: MQ destructive read/get Reply with quote

Newbie

Joined: 21 May 2019
Posts: 2

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
PostPosted: Wed May 22, 2019 5:03 am Post subject: Reply with quote

Grand High Poobah

Joined: 11 Nov 2005
Posts: 25671
Location: Ohio, USA

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.
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Insanity is the best defence.
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