WebSphere Message Brokers
File: aq01170_
Writer: Terry Cowling

Concept topic

This build: July 31, 2007 21:35:09

Subscriptions

A subscription is a record that contains the information that a subscriber passes to its local broker to describe the publications that it wants to receive.

A subscription consists of the following information:

Subscribers issue subscription registration requests to their local broker when they want to receive published messages. All the information associated with the subscription is recorded by the broker in the broker's subscription table.

When the broker receives a publication, it scans its subscription table to determine whether there is a subscription request that matches the topics, subscription point, and filter, of the publication. For each subscription request that matches, the broker forwards the publication to the subscriber queue that is specified, unless the subscriber has requested, by specifying the PubOnReqOnly option on its request, that it only wants publications that are newly published.

A subscription is removed from the subscription table only when one of the following events occurs:
Related concepts
Topics
Publishers
Publications
Subscribers
Publish/subscribe topologies
Related tasks
Subscribing
Related reference
Publication node
Publish message
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Copyright IBM Corporation 1999, 2007Copyright IBM Corporation 1999, 2007. All Rights Reserved.
This build: July 31, 2007 21:35:09

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