||A marker interface for an event to be executed by an ASync instance.
||The interface through an ASync instance exports its methods to a service.
||An interface to be implemented by services that perform I/O through an ASync
||A marker interface for an event registered under an
ASyncService with an
||An interface through which a service can inspect what other services are
using the ASync instance by finding their respective keys.
||An interface for managing
ASyncService objects with an
||A callback interface to invoke once an ASync service has started.