Event

ActionEventEmitter

To add event-driven capabilities to prooph components prooph/common provides a basic implementation of an event emitter and an default action event object. We call these events action events because we want to differentiate them from domain events.

A domain event describes something happened in the past.

An action event on the other side is an communication object used to pass parameters from one listener to the next listener during an event-driven process. Furthermore an action event can be stopped which in turn stops the running process. All prooph components type hint the interfaces Prooph\Common\Event\ActionEventEmitter, Prooph\Common\Event\ActionEventListener/ListenerAggregate, Prooph\Common\Event\ActionEvent and therefor allow the usage of custom implementations. If you don't inject your own implementations all components fall back to the default implementations provided by prooph/common.