MQSeries Publish/Subscribe brokers provide information about publishers and subscribers via a special set of topics called metatopics. Metatopics start with the "MQ/S/" or "MQ/SA/" prefix, and are subscribed to by two categories of applications, administration programs and clients.
WebSphere Business Integration Event Broker does not provide equivalent metatopics, and therefore a program (administration or client) that subscribes to MQSeries Publish/Subscribe metatopics cannot work with a WebSphere Business Integration Event Broker broker. However, WebSphere Business Integration Event Broker does publish information about subscription events using its own set of system topics.
The following considerations apply to the two categories of application in the WebSphere Business Integration Event Broker environment.
Administration programs (for example, the amqspsd sample) use MQSeries Publish/Subscribe metatopics to display subscription information. This information is provided by WebSphere Business Integration Event Broker in the workbench, which allows subscriptions to be viewed and deleted throughout the broker network.
Applications use messages published on MQSeries Publish/Subscribe metatopics to, for example, request information about their own current subscriptions.
A client program can subscribe to WebSphere Business Integration Event Broker system topics and process the event publications.
WebSphere Business Integration Event Broker does not provide a topic that reports all the current subscriptions for a particular topic or client, but does publish whenever subscriptions are added or removed. This information is published as event information whereas MQSeries Publish/Subscribe metatopics are published as state information.
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