More structured FID representation.
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@ -13,14 +13,18 @@
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(require "pattern.rkt")
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(require "bag.rkt")
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;; An `ActorID` uniquely identifies an actor in a `Dataspace`.
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;;
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;; A `FID` is a Facet ID, uniquely identifying both a facet and its
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;; ancestry in a `Dataspace`.
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;;
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;; FID = (Listof Nat)
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;; FID = (facet-id ActorID (Listof Nat))
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;;
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;; The first `Nat` in the list is the unique identifier for this
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;; facet; the `cdr` of the list is the FID of its parent facet. No two
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;; `FID`s in a `Dataspace` have the same first `Nat`.
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(struct facet-id (actor path) #:prefab)
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;;
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;; The first `Nat` in `path` is the unique identifier for this facet;
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;; the `cdr` of the list is the `path` its parent facet. No two `FID`s
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;; in a `Dataspace` have the same first `Nat` in their `path`.
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;; A `Dataspace` is a ... TODO
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@ -33,7 +37,7 @@
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(struct dataspace ([next-id #:mutable] ;; Nat
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routing-table ;; Skeleton
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facets ;; (MutableHash FID Facet)
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actors ;; (MutableHash FID Any) ;; maps FID to actor name
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actors ;; (MutableHash ActorID Any) ;; maps ActorID to actor name
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assertions ;; (Bagof Assertion)
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dataflow ;; DataflowGraph
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pending-scripts ;; (MutableVectorof (Queueof (-> Any)))
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@ -41,7 +45,7 @@
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)
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#:transparent)
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(struct facet (id ;; FID
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(struct facet (fid ;; FID
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endpoints ;; (MutableHash EID Endpoint)
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[stop-scripts #:mutable] ;; (Listof Script) -- IN REVERSE ORDER
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[children #:mutable] ;; (Setof FID)
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@ -59,7 +63,7 @@
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;; it on access.
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(struct field-handle (name ;; Symbol
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id ;; Nat
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owner ;; FID
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owner ;; ActorID
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[value #:mutable] ;; Any
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)
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#:methods gen:custom-write
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@ -135,34 +139,36 @@
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(set-dataspace-next-id! ds (+ id 1))
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id))
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;; TODO: remove??
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(define (fid-parent fid)
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(cdr fid))
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(match-define (facet-id actor (cons _ path)) fid)
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(facet-id actor path))
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(define (generate-fid! ds parent-fid)
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(cons (generate-id! ds) parent-fid))
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(define (actor-fid? fid)
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(null? (fid-parent fid)))
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(define (fid->actor-fid fid)
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(if (actor-fid? fid)
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fid
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(fid->actor-fid (fid-parent fid))))
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(match-define (facet-id actor path) parent-fid)
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(facet-id actor (cons (generate-id! ds) path)))
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(define (fid-ancestor? fid maybe-ancestor)
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(and (pair? fid) ;; empty fid lists obviously no ancestors at all!
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(or (equal? fid maybe-ancestor)
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(fid-ancestor? (cdr fid) maybe-ancestor))))
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(and (equal? (facet-id-actor fid) (facet-id-actor maybe-ancestor))
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(let ((b-path (facet-id-path maybe-ancestor)))
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(let walk ((a-path (facet-id-path fid)))
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(and (pair? a-path) ;; empty fid lists obviously no ancestors at all!
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(or (equal? a-path b-path)
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(walk (cdr a-path))))))))
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(define (has-parent? fid)
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(pair? (cdr (facet-id-path fid))))
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(define (add-actor! ds name boot-proc initial-assertions)
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(define actor-fid (generate-fid! ds '()))
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(hash-set! (dataspace-actors ds) actor-fid name)
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(define actor-id (generate-id! ds))
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(define root-fid (facet-id actor-id (list actor-id))) ;; TODO: bad convention. Use a fresh Nat, don't reuse actor-id in the path
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(hash-set! (dataspace-actors ds) actor-id name)
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(for [(a initial-assertions)]
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(match (bag-change! (dataspace-assertions ds) a 1)
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['absent->present (add-assertion! (dataspace-routing-table ds) a)]
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;; 'absent->absent and 'present->absent absurd
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['present->present (void)])) ;; i.e. no visible change
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(add-facet! ds #f actor-fid (lambda ()
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(add-facet! ds #f root-fid (lambda ()
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(boot-proc)
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(for [(a initial-assertions)] (dataspace-retract! ds a)))))
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@ -176,7 +182,7 @@
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(current-facet-id fid)
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(in-script? script?))
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(with-handlers ([(lambda (e) (not (exn:break? e)))
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(lambda (e) (terminate-actor! ds (fid->actor-fid fid)))]) ;; TODO: tracing
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(lambda (e) (terminate-actor! ds (facet-id-actor fid)))]) ;; TODO: tracing
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body ...
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(void)))))
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@ -258,14 +264,15 @@
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'()
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(set)))
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(hash-set! (dataspace-facets ds) fid f)
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(when (pair? parent-fid)
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(when (has-parent? fid)
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(define pf (lookup-facet ds parent-fid))
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(when pf (set-facet-children! pf (set-add (facet-children pf) fid))))
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(with-current-facet [ds fid #f]
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(boot-proc))
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(schedule-script!* ds (lambda ()
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(when (and (facet-live? ds fid)
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(or (and (pair? parent-fid) (not (facet-live? ds parent-fid)))
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(or (and (has-parent? fid)
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(not (facet-live? ds parent-fid)))
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(facet-live-but-inert? ds fid)))
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(terminate-facet! ds fid)))))
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@ -295,11 +302,9 @@
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(when h (dataspace-unsubscribe! ds h))))))
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;; Abruptly terminates an entire actor, without running stop-scripts etc.
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(define (terminate-actor! ds actor-fid)
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(when (not (actor-fid? actor-fid))
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(error 'terminate-actor! "Attempt to terminate non-actor FID ~a" actor-fid))
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(hash-remove! (dataspace-actors ds) actor-fid)
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(let abort-facet! ((fid actor-fid))
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(define (terminate-actor! ds actor-id)
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(hash-remove! (dataspace-actors ds) actor-id)
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(let abort-facet! ((fid (facet-id actor-id (list actor-id)))) ;; TODO: ugh
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(define f (lookup-facet ds fid))
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(when f
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(hash-remove! (dataspace-facets ds) fid)
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@ -312,7 +317,7 @@
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(when f
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(define parent-fid (fid-parent fid))
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(when (pair? parent-fid)
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(when (has-parent? fid)
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(define pf (lookup-facet ds parent-fid))
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(when pf (set-facet-children! pf (set-remove (facet-children pf) fid))))
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@ -335,7 +340,7 @@
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#:priority *gc-priority*
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ds
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(lambda ()
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(if (pair? parent-fid)
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(if (has-parent? fid)
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(when (facet-live-but-inert? ds parent-fid) (terminate-facet! ds parent-fid))
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(terminate-actor! ds fid))))))
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@ -415,7 +420,7 @@
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(lambda ()
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(define current-value (field-handle 'current-value
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(generate-id! (current-dataspace))
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(fid->actor-fid (current-facet-id))
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(facet-id-actor (current-facet-id))
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0))
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(add-endpoint! (current-dataspace)
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'stop-when-ten
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