Event-driven architecture

Event-driven architecture (EDA) is a pattern of architecture for applications following the tips of production, detection, consumption of, and reaction to events.

It is possible to describe an event as a change of state. For example, if a door is closed and somebody opens it, the state of the door changes from closed to opened. The service to open the door has to make this change like an event, and that event can be known by the rest of the services.

An event notification is a message that was produced, published, detected, or consumed asynchronously and it is the status changed by the event. It is important to understand that an event does not move around the application, it just happens. The term event is a little controversial because it usually means the message event notification instead of the event, so it is important to know the difference between the event and the event notification.

This pattern is commonly used in applications based on components or microservices...