WebSphere Message Brokers
File: aq01190_
Writer: Terry Cowling

Concept topic

This build: July 31, 2007 21:35:10

Publish/subscribe topologies

A publish/subscribe topology consists of the brokers, the collectives, and the connections between them, that support publish/subscribe applications in the broker domain.

A publish/subscribe application can consist of a network of brokers connected together. The brokers can all be on the same physical system, or they can be distributed over several physical systems. By connecting brokers together, publications can be received by a client on any broker in the network.

This provides the following benefits:

Publications are sent only to brokers that have subscribers that have expressed an interest in the topics being published. This helps to optimize network traffic.

Broker networks

There are three ways of connecting brokers together to make a broker domain:
  • Brokers can be simply joined together.
  • Brokers can be grouped together into collectives, where a collective is a set of one or more brokers that are directly connected to each other.
  • Collectives can be joined together; this is a combination of the previous two ways of grouping brokers together.

The following diagram shows a network of six collectives.

This diagram shows a network of six collectives; there is a  two-broker collective connected to three collectives, with four, one, and three brokers, respectively; the four-broker collective has two further collectives connected to it with five and three brokers, respectively.
Related concepts
Brokers
Collectives
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This build: July 31, 2007 21:35:10

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