version 1 .
embeddedType EntityRef.Cap .

; Asserts that a service should begin (and stay) running after waiting
; for its dependencies and considering reverse-dependencies, blocks,
; and so on.
RequireService = <require-service @serviceName any>.

; Asserts that a service should begin (and stay) running RIGHT NOW,
; without considering its dependencies.
RunService = <run-service @serviceName any>.

; Asserts one or more current states of service `serviceName`. The
; overall state of the service is the union of asserted `state`s.
;
; Only a few combinations make sense:
;  - `started`
;  - `started` + `ready`
;  - `failed`
;  - `complete`
;
ServiceState = <service-state @serviceName any @state State>.

; A running service publishes zero or more of these. The details of
; the object vary by service.
;
ServiceObject = <service-object @serviceName any @object any>.

; Possible service states.
State =
/ ; The service has begun its startup routine, and may or may not be
  ; ready to take requests from other parties.
  =started
/ ; The service is ready to take requests from other parties.
  ; (This state is special in that it is asserted *in addition* to `started`.)
  =ready
/ ; The service has failed.
  =failed
/ ; The service has completed execution.
  =complete
/ ; Extension or user-defined state
  @userDefined any
.

; Asserts that, when `depender` is `require-service`d, it should not be started until
; `dependee` has been asserted, and also that `dependee`'s `serviceName` should be
; `require-service`d.
ServiceDependency = <depends-on @depender any @dependee ServiceState>.

; Message. Triggers a service restart.
RestartService = <restart-service @serviceName any>.