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MQSeries.net Forum IndexGeneral IBM MQ SupportDoes IBM MQ offer stateful connections?

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MQMB&WAS
PostPosted: Sat Aug 11, 2018 8:44 am Post subject: Does IBM MQ offer stateful connections? Reply with quote

Voyager

Joined: 12 Jun 2016
Posts: 88

Hello experts,

I was asked by someone if IBM MQ supports stateful connections and I didn't know the answer.

I know what stickiness/cookie/stateful connections in general, for example how web applications do that. But, couldn't understand what it meant in MQ world.
Appreciate if someone could explain what it is and if it is available/supported in IBM MQ.

Thanks
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gbaddeley
PostPosted: Sun Aug 12, 2018 4:30 pm Post subject: Reply with quote

Padawan

Joined: 25 Mar 2003
Posts: 1901
Location: Melbourne, Australia

MQ connections and MQI messaging operations are not described as "stateful" in any of the MQ documentation. However, MQ operations are not completely atomic. MQ maintains internal information about the connection, objects that are open, and UOW transactions in progress. This is not exposed to the app (other than via object handles and object instances), so the app shouldn't need to use this to store, retrieve or persist any state information across multiple calls. Does that help?
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MQMB&WAS
PostPosted: Mon Aug 13, 2018 3:31 pm Post subject: Reply with quote

Voyager

Joined: 12 Jun 2016
Posts: 88

gbaddeley wrote:
MQ connections and MQI messaging operations are not described as "stateful" in any of the MQ documentation. However, MQ operations are not completely atomic. MQ maintains internal information about the connection, objects that are open, and UOW transactions in progress. This is not exposed to the app (other than via object handles and object instances), so the app shouldn't need to use this to store, retrieve or persist any state information across multiple calls. Does that help?


thanks for the information, gbaddeley.
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bruce2359
PostPosted: Mon Aug 13, 2018 6:01 pm Post subject: Reply with quote

Poobah

Joined: 05 Jan 2008
Posts: 8192
Location: US: west coast, almost. Otherwise, enroute.

MQ is not a transaction manager - it has limited capability (triggering) to instantiate work. An MQ queue manager can participate in UofW - an MQ app can be coordinator of a local UofW, but needs an XA-compliant transaction manager to coordinate global uofws that span multiple resource managers.
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