MQSeries.net :: View topic - psc

sieijish · Posted: Thu May 25, 2006 8:08 am Post subject:

Assume the following subscription is already there on the broker

<psc>
<Command>RegSub</Command>
<Topic>Topic1</Topic>
<QMgrName>GATEWAY_QM</QMgrName>
<QName>TESTQ</QName>
</psc>

Now if I want to receive messages on Topic2 also on the same queue, then if say, I issue another <psc> command.

<psc>
<Command>RegSub</Command>
<Topic>Topic1</Topic>
<Topic>Topic2</Topic>
<QMgrName>GATEWAY_QM</QMgrName>
<QName>TESTQ</QName>
</psc>

Now when broker executes this command, will it acutally replace the subscription which was already there for Topic1? or does the command simply ignore the one for Topic1 as it already exists?

If there are any messages published during the time while broker is doing this subscription change, is there any tiny window where I could lose the messages published on Topic1 while broker was replacing the original subscription?

I can avoid Topic1 in the second command but just wonder how broker handles this.