SubscriptionDirectory
What a wait needs to know about the subscriptions its chain names, until the Manifest gives it (admission checks the chain against the Manifest).
The subscription runtime is one implementation, for the subscriptions of its own service; a Manifest-backed one will answer for other contexts too.
Inheritors
Functions
Whether subscription of type's context handles the streams of type. By default, whether the subscription is known in that context at all; a directory that knows the subscriptions' filters answers per aggregate type.
The contexts of the commands the saga subscription of context declares it derives, or null when it declares none, or they cannot all be resolved: then a chain may follow its hop into any context.
Whether context is a bounded context this directory knows, so a hop may name it. True by default: a directory that knows only subscriptions cannot tell.
Whether subscription has handled stream for good: its checkpoint is past the stream's position and its aggregate is not parked. False when that cannot be told.
The kind of subscription in context, or null when it is not known.