How to check that we have read all messages from MQ

Question

need your help with updating the following code,currently this code fetches the first msg from IBM MQ ,but my requirement is to fetch until MQ is empty

    private JmsTemplate jmsTemplate;

public JmsTemplate getJmsTemplate() {
    return jmsTemplate;
}

@Autowired
public void setJmsTemplate(JmsTemplate jmsTemplate) {
    this.jmsTemplate = jmsTemplate;
}

public String onMessage() throws JMSException, IOException {        

    Message source = jmsTemplate.receive("LQ.SCCO4313");

    BytesMessage bm = (BytesMessage) source;

    byte[] byteArr = new byte[(int) bm.getBodyLength()];
    bm.readBytes(byteArr); 

    String msg = new String(byteArr, "UTF-8");  

    logger.info("Message " + msg);
    logger.info("MESSAGE received from myMessageQueue ");
    return msg;

}

score 0 · Answer 1 · answered Apr 02 '15 at 02:17

0

A JMS MessageConsumer's receive() or receiveNoWait() would return with null where there is no message in a queue. There will be an exception if there is any internal error.

So you can check for source == null in your code.

answered Apr 02 '15 at 02:17

Shashi

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I can check for null but how long would it fetch for? – Tanuja Gupta Apr 09 '15 at 14:03
Till the last message in the queue is browsed. – Shashi Apr 09 '15 at 14:24

How to check that we have read all messages from MQ

1 Answers1