Software Architect's Handbook

The broker topology

In a broker topology, the event messages created by event producers enter an event broker, sometimes referred to as an event bus. The event broker contains all of the event channels used for the event flow. The event channels may be message queues, message topics, or some combination of the two.

Unlike the mediator topology, there is no event queue with the broker topology. The event processors are responsible for picking up events from an event broker:

This topology is ideal when the processing flow is fairly simple and there is no need for centralized event orchestration. Events flow to the event processor from the