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| MQQueueManager disposal rollsback received messages |
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Message
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| costasz |
 Posted: Tue Nov 25, 2008 12:43 pm Post subject: MQQueueManager disposal rollsback received messages |
 |
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Novice
Joined: 26 Mar 2008
Posts: 18
|
Sample code
The 2nd line causes any received messages to reappear on queue
queueManager.Close();
}
The close bracket basically closes this using block
using (IBM.WMQ.MQQueueManager queueManager = new MQQueueManager(mqConnectionInfo.MqManager))
{
The using block disposes of the MQQueueManager. Can someone help with this?
Thanks
Full method:
private void doWork(MsmqToMqArg args)
{
try
{
using (System.Messaging.MessageQueue msmq = new System.Messaging.MessageQueue(args.MsmqConnection))
{
MQConnectionInfo mqConnectionInfo = new MQConnectionInfo(args.MqConnection);
MqHelper.SetEnvBasedOnConnection(mqConnectionInfo);
using (IBM.WMQ.MQQueueManager queueManager = new MQQueueManager(mqConnectionInfo.MqManager))
{
using (IBM.WMQ.MQQueue mqQueue = queueManager.AccessQueue(mqConnectionInfo.MqQueue, MQC.MQOO_INPUT_AS_Q_DEF | MQC.MQOO_FAIL_IF_QUIESCING))
{
while (!this.CancellationPending)
{
IBM.WMQ.MQMessage mqMessage = new MQMessage();
MQGetMessageOptions gmo = new MQGetMessageOptions();
gmo.Options = MQC.MQGMO_CONVERT + MQC.MQGMO_WAIT; //Wait until message arrives
if (args.Transactional)
{
gmo.Options += MQC.MQGMO_SYNCPOINT;
}
else
{
gmo.Options += MQC.MQGMO_NO_SYNCPOINT;
}
try
{
if (args.Transactional)
{
TransactionOptions options = new TransactionOptions();
options.IsolationLevel = System.Transactions.IsolationLevel.ReadCommitted;
options.Timeout = TransactionManager.DefaultTimeout;
using (TransactionScope scope = new TransactionScope(TransactionScopeOption.Required, options, EnterpriseServicesInteropOption.Automatic))
{
mqQueue.Get(mqMessage, gmo);
if (mqMessage != null)
{
using (System.Diagnostics.EventLog eventLog = new System.Diagnostics.EventLog())
{
eventLog.Source = "MQ2MSMQBridge";
eventLog.WriteEntry("Picked up message", EventLogEntryType.Information);
}
System.Messaging.Message msmqMsg = new System.Messaging.Message();
MqHelper.CopyContents(mqMessage, msmqMsg);
msmq.Send(msmqMsg,MessageQueueTransactionType.Automatic);
// THROW EXCEPTION TO TEST ROLLBACK
/*
int y = 0;
int x = 10 / y;
*/
//
scope.Complete();
}
using (System.Diagnostics.EventLog eventLog = new System.Diagnostics.EventLog())
{
eventLog.Source = "MQ2MSMQBridge";
eventLog.WriteEntry("Sent message", EventLogEntryType.Information);
}
}
}
}
catch (IBM.WMQ.MQException mqex)
{
if (mqex.ReasonCode != 2033)
throw;
}
}
mqQueue.Close();
}
queueManager.Close();
}
msmq.Close();
}
}
catch (IBM.WMQ.MQException mqex)
{
using (System.Diagnostics.EventLog eventLog = new System.Diagnostics.EventLog())
{
eventLog.Source = "MQ2MSMQBridge";
eventLog.WriteEntry(mqex.Message + " - " + mqex.ReasonCode.ToString(),EventLogEntryType.Error);
}
}
catch (Exception ex)
{
using (System.Diagnostics.EventLog eventLog = new System.Diagnostics.EventLog())
{
eventLog.Source = "MQ2MSMQBridge";
eventLog.WriteEntry(ex.Message, EventLogEntryType.Error);
}
}
} |
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| fjb_saper |
| Posted: Wed Nov 26, 2008 2:59 pm Post subject: |
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|
Grand High Poobah
Joined: 18 Nov 2003
Posts: 20696
Location: LI,NY
|
So it looks you are relying on an implicit commit here.
Is there a way to have your session explicitly force the commit of all resources?
Relying on a default behavior is never good as it may vary from platform to platform. I prefer to explicitly roll back or commit my transaction, even if it is to catch the exception on the commit and call rollback right after.
Have fun. 
_________________
MQ & Broker admin |
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| costasz |
| Posted: Fri Nov 28, 2008 6:27 am Post subject: scope.Complete() is an explicit commit thru DTC. |
|
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Novice
Joined: 26 Mar 2008
Posts: 18
|
BTW, I found the issue. I needed to call MQQueueManager.Disconnect();
before it went out of scope and got garbage collected. Sounds like a bug to me. |
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| fjb_saper |
| Posted: Fri Nov 28, 2008 6:38 am Post subject: Re: scope.Complete() is an explicit commit thru DTC. |
|
|
Grand High Poobah
Joined: 18 Nov 2003
Posts: 20696
Location: LI,NY
|
| costasz wrote: |
BTW, I found the issue. I needed to call MQQueueManager.Disconnect();
before it went out of scope and got garbage collected. Sounds like a bug to me. |
Sounds like a programing error to me.
Typically it is a very bad practice for resources (and a qmgr is considered a resource) to get closed at garbage collection and even worse for it to be out of scope at that time.
Best practice says: When your resource is no longer used you need to release it. Releasing it only at finalization / garbage collection time is very wasteful and can cause a number of problems.
Have fun
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| Vitor |
| Posted: Fri Nov 28, 2008 6:57 am Post subject: Re: scope.Complete() is an explicit commit thru DTC. |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
|
| costasz wrote: |
I needed to call MQQueueManager.Disconnect();
before it went out of scope and got garbage collected. |
You sound surprised. Of course you need to disconnect from the queue manager. If you don't it looks to the queue manager like your application's abended and it performs a rollback.
_________________
Honesty is the best policy.
Insanity is the best defence. |
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