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Requesting information from a publisher

Under some circumstances, subscribers can request information directly from a publisher without involving the broker.

A publisher can specify that it is willing to receive direct requests for information from other applications. In this case, the publisher must make its queue and queue manager names (and possibly correlation identifier) known to subscribers by including them in a publication that advertises the availability of other publications on direct request.

Alternatively, subscribers can subscribe to information about publishers (called metatopics). They can discover the names of publishers who are willing to accept direct requests for publications on this topic. (See Metatopics for information about metatopics.)

The subscriber can use this information to send a normal WebSphere MQ message (using the MQI) directly to the publisher. The publisher can then use the MQI to send the publication directly to the subscriber.

 

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