The sandbox instance that serves the module.
A lifecycle hook that is called when something stops the module.
A lifecycle hook that is called when something starts the module.
A lifecycle hook that is called when the module receives a message.
A lifecycle hook that is called when the module has already been started and something tries to start it again.
A lifecycle hook that determines what messages the module should subscribe for.
An object that represents a part of your domain. It contains business logic related to its particular job.