StageCrewMember
You can think of the StageCrewMember as an in-memory micro-service that reacts to DomainEvents from the StageManager. Every StageCrewMember receives a reference to the Stage, and therefore StageManager as well, which enables them to emit DomainEvents back.
Useful when you're interested in implementing custom reporters.
Extends:
ListensToDomainEvents → StageCrewMember