Publish/subscribe messaging through a WebSphere MQ link

On a WebSphere® MQ link, you can set up publish/subscribe messaging between WebSphere Application Server and the WebSphere MQ publish/subscribe function, or WebSphere Message Broker, or WebSphere Event Broker.

The following product versions provide publish/subscribe capability that you can use with WebSphere Application Server over a WebSphere MQ link:
WebSphere MQ Version 7
Provides publish/subscribe function that is integrated into WebSphere MQ queue managers. This capability is called integrated publish/subscribe. The publish/subscribe capability for earlier versions of WebSphere MQ is called queued publish/subscribe, because you communicate with a separate publish/subscribe broker by means of messages placed on queues.
WebSphere Message Broker Version 6
Provides a separate publish/subscribe broker for queued publish/subscribe. This version of queued publish/subscribe uses MQRFH2 message headers. If you are using WebSphere MQ Version 6, you can use WebSphere Message Broker Version 6 to provide publish/subscribe function that interoperates over a WebSphere MQ link with WebSphere Application Server. From WebSphere Message Broker Version 7, this product no longer provides a separate publish/subscribe broker, and all topic-based publish/subscribe operations made through the product use WebSphere MQ facilities.
WebSphere Event Broker
Provides a separate publish/subscribe broker for queued publish/subscribe. This version of queued publish/subscribe is the same as that in WebSphere Message Broker Version 6.

WebSphere MQ Version 6 (except Version 6 of WebSphere MQ for z/OS) provides queued publish/subscribe that is implemented by a publish/subscribe broker within WebSphere MQ. However, the publish/subscribe function provided by WebSphere MQ Version 6 uses MQRFH message headers, also known as MQRFH1 message headers, and it does not support the MQRFH2 message headers that the WebSphere Application Server publish/subscribe bridge uses on the WebSphere MQ link. For WebSphere MQ Version 6 publish/subscribe to interoperate with WebSphere Application Server publish/subscribe over a WebSphere MQ link, you must use a separate message broker product that supports MQRFH2 message headers. Alternatively, instead of using a WebSphere MQ link, you can interoperate using the WebSphere MQ messaging provider, so that your applications use WebSphere MQ publish/subscribe function and do not use the service integration bus. This requirement also applies to earlier versions of WebSphere MQ where publish/subscribe function is provided by SupportPac MA0C.

Message headers and contents are mapped in the same way for both point-to-point messages and publish/subscribe messages. For more information about the mapping of messages see Mapping messages between a service integration bus and WebSphere MQ.

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Last updated: Oct 21, 2010 3:36:59 AM CDT
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