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| Subscriber throw exception when system time changed |
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| leland |
 Posted: Thu Feb 12, 2009 6:08 pm Post subject: Subscriber throw exception when system time changed |
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Novice
Joined: 12 Feb 2009
Posts: 13
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Hi
I am writing .net application using XMS, there is a durable subscriber in the application, everything works fine until I change the system's time(WinXP SP2), the mq connection receives an exception as below:
IBM.XMS.IllegalStateException: CWSMQ0006E
IBM.XMS.WMQ.WmqMessageConsumer.GetAMessage(Int64 timeOut)
IBM.XMS.WMQ.WmqMessageConsumer.ReceiveAsync(Int64 timeout)
IBM.XMS.WMQ.WmqAsynchronous.Run()
Linked Exception : CompCode: 2, Reason: 2009"
I have noticed that there is no message receiving at that time, and the exception is not throw every time I change the system's time, but it occurs if I keep changing the time many times.
Can any one help me?
Thanks  |
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| gunter |
| Posted: Fri Feb 13, 2009 1:08 am Post subject: |
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Partisan
Joined: 21 Jan 2004
Posts: 307
Location: Germany, Frankfurt
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Hi,
its not a good idea to change the system time if time critical programs are running. Timeouts are calculated by differences between timestamps.
Changing the time my result in negativ values, these are very big values if unsigned. Use a time server instead.
Gunter
_________________
Gunter Jeschawitz
IBM Certified System Administrator - Websphere MQ, 5.3 |
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| leland |
| Posted: Sun Feb 15, 2009 6:12 pm Post subject: |
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Novice
Joined: 12 Feb 2009
Posts: 13
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| gunter wrote: |
Hi,
its not a good idea to change the system time if time critical programs are running. Timeouts are calculated by differences between timestamps.
Changing the time my result in negativ values, these are very big values if unsigned. Use a time server instead.
Gunter |
Thanks 4 your reply.
Since the subscriber is in client-side, it is nothing I can do to limit the time change operation(actually the time is required to chagne in some scenarios), and this exception makes my application kind of unstablable.
I have tried to re-establish mq connection when exception throws, it works at the first time, but after I change the subscriber to durable subscriber, another exception throws(The durable subscriber can be registed when the application starts, but can not be registed again when excption throws).
IBM.XMS.XMSException:Message="CWSMQ0006E:WmqSubscriptionEngine.OpenDurableSubscription (#3) CompCode: 2, Reason: 3156。
Source="IBM.XMS.WMQ"
ErrorCode="CWSMQ0006"
StackTrace:
IBM.XMS.WMQ.WmqSubscriptionEngine.OpenDurableSubscription(WmqSession s, WmqTopic t, String selector, Boolean noLocal, Boolean sharedQueue, String qName, String subName)
IBM.XMS.WMQ.WmqMessageConsumer.PubSubInitialise(String subName)
IBM.XMS.WMQ.WmqMessageConsumer..ctor(IDestination destination, String selector, Boolean noLocal, Boolean durable, WmqSession session, String subName)
IBM.XMS.WMQ.WmqSession.CreateDurableSubscriber(IDestination dest, String subscription, String selector, Boolean noLocal)
Here is my pseudocode.
public void OnMQException()
{
TryCloseSubscriber();
TryCloseSession();
TryCloseConnection();
bool connected = Connect(); // I have set the client id in connection facotry.
if (connected)
{
CreateSession();
CreateDurableSubscriber(); // The exception throws here.
}
}
Any idea about that? Thanks. |
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