Software Architect's Handbook

Event notification

An architecture that provides event notification is one in which the software system sends a message when an event takes place. This functionality is the most common in software systems that have an EDA. The mediator and broker topologies allow us to implement event notifications.

There is a loose coupling between the event producer and any event consumers as well as between the logic that sends event messages and logic that responds to the events. This loose coupling allows us to change the logic in one without affecting the other. Event processor components are single-purpose and independent of other event processors, allowing them to be modified without affecting others.

The drawback to the loose coupling between event ...