A Subscription has information to configure an event handler.

The Dispatcher interface manages handlers for a number of events as well as dispatching events to those handlers.

A FormattedEventSink accepts formatted events, i.e.

A FormatterFactory returns a formatter which will send events to the given FormattedEventSink.

A HandlerFactory knows how to create a given event handler type using the provided configuration map.

A TypeRegistrar handles registering and unregistering handlers for a given event type.

FormatterFactoryF is a function version of FormatterFactory.

A RegistrationHandler can take a handler, which may implement multiple event handler interfaces, and configure it using the configuration map provided.

A UnregistrationHandler will remove give handler, if implements the interface for this event type and is registered to receive events of this type.