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| MTS & MQSeries ? Weired |
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| chinlean |
 Posted: Sat Mar 16, 2002 7:30 pm Post subject: |
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Newbie
Joined: 15 Mar 2002
Posts: 4
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I've encapsulate the send method in a MTS component with this :
HRESULT send(BSTR queue,BSTR body)
At the implementation of the method, I just use normal procedure
a) Connect to queue manager
b) open queue
c) write message
d) close queue
e) disconnect queue manager
When I call this component’s method from another MTS component(let say a component doing DB update and then call this method to send out a message to MQSeries)
It’s work fine if I call the method once. But failed when I make the second call. When I debug, I found that in second call, the mqmanager.connect() failed with reason code MQRC_UNEXPECTED_ERROR(2195) .
Here is some info of my environment.
1) MQSeries 5.2 Server CSD02 for Windows 2000
2) I use C++ early binding.
Besides, I encounter a lot of weird thing when integrate MQSeries with MTS for example
1) when mixture usage of transactional and non transactional mode under MTS, MQSeries complaint with MQRC_UNEXPECTED_ERROR(2195).
2) When I ungrade MQSeries server to CSD03. It cause DTC crash…
It’s seems like MQSeries is integrating not very well with MTS or I use the MQSeries wrongly. Also the documentation and code sample is very limited for MQSeries MTS support…Do you know where to find extra information?
[ This Message was edited by: chinlean on 2002-03-19 01:42 ] |
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| chinlean |
| Posted: Tue Mar 19, 2002 2:08 am Post subject: |
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Newbie
Joined: 15 Mar 2002
Posts: 4
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After i wrote some program to test the MTS behavior of MQSeries including step thru every single step of the code in debug mode , thease are the summary I can make.
1) The transaction begin when you connect to queue manager, NOT when you issue a syncpoint call( put/get). I notice that when I step over ImqqueueManager.connect(), the Transaction List under Component Services begin to appear.
2)You CANNOT disconect a queue manager in a MTS object. If you do, when another MTS object under the SAME transaction issue ImqqueueManager.connect(), it will return MQRC_UNEXPECTED_ERROR(2195) immediately. MQSeries expect you won't disconnect queue manager from within sub objects and can only disconnect from within root object. This already break ACID rule of transactional programing whereas a MTS object should independent with another object or they can operate seperately.
thanks
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