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| Get all mesasages(java) |
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Message
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| joppe |
 Posted: Mon Oct 24, 2011 11:45 pm Post subject: Get all mesasages(java) |
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Newbie
Joined: 10 Oct 2011
Posts: 4
Location: Oslo - Norway
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Hi.
I am writing some small test applications in java just for the learning experience and one of the things I would like to do is to get all the messages on a queue in one loop. The following works great, but something tells me that there must be a better way to do this. I personally don't like using exceptions as program logic.
One more thing - Do I need to create a new MQMessage object each time I am getting a message from the Queue (I tried clearMessage(), but no luck)?
Any thoughts?
| Code: |
public ArrayList<String> getAllMessagesFromQueue(){
ArrayList<String> messagelist = new ArrayList<String>();
MQMessage messageBuffer = new MQMessage();
MQGetMessageOptions gmo = new MQGetMessageOptions();
try {
while(true){
myQueue.get(messageBuffer, gmo);
messagelist.add(messageBuffer.readUTF());
messageBuffer = new MQMessage();
}
} catch (MQException e) {
System.out.println("Websphere MQ ERROR occured : Completion code " + e.completionCode
+ " Reason Code " + e.reasonCode);
if(e.reasonCode == 2033){
//"EOF" - no more messages on queue!
return messagelist;
}
//e.printStackTrace();
} catch (IOException e){
System.out.print("IOException:");
e.printStackTrace();
}
return null;
}
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| mqjeff |
| Posted: Tue Oct 25, 2011 1:42 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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| You should be checking the Reason Code after each Get. If it's a 2033, or a few other things, you should stop the loop. |
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| fjb_saper |
| Posted: Tue Oct 25, 2011 6:35 am Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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Know that readUTF an writeUTF come in a pair. For all other stuff use simple write and read.
If you do not create a new message every time around the loop, the minimum you need to do is reinitialize msgId and correlId to MQC.MQMI_NONE and MQC.MQCI_NONE before each get.
Have fun 
_________________
MQ & Broker admin |
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| mqjeff |
| Posted: Tue Oct 25, 2011 6:52 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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| fjb_saper wrote: |
| Know that readUTF an writeUTF come in a pair. For all other stuff use simple write and read. |
And don't, in general, use readUTF OR writeUTF.
They impose a very small limit on the size of the text. |
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