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syndicate-rkt
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More structured FID representation.

This commit is contained in:
Tony Garnock-Jones 2018-04-08 07:58:17 +01:00
parent 3c70496688
commit fe6b895d8a
1 changed files with 41 additions and 36 deletions
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77
syndicate/dataspace.rkt
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@ -13,14 +13,18 @@
(require "pattern.rkt")
(require "bag.rkt")
;; An `ActorID` uniquely identifies an actor in a `Dataspace`.
;;
;; A `FID` is a Facet ID, uniquely identifying both a facet and its
;; ancestry in a `Dataspace`.
;;
;; FID = (Listof Nat)
;; FID = (facet-id ActorID (Listof Nat))
;;
;; The first `Nat` in the list is the unique identifier for this
;; facet; the `cdr` of the list is the FID of its parent facet. No two
;; `FID`s in a `Dataspace` have the same first `Nat`.
(struct facet-id (actor path) #:prefab)
;;
;; The first `Nat` in `path` is the unique identifier for this facet;
;; the `cdr` of the list is the `path` its parent facet. No two `FID`s
;; in a `Dataspace` have the same first `Nat` in their `path`.
;; A `Dataspace` is a ... TODO
@ -33,7 +37,7 @@
(struct dataspace ([next-id #:mutable] ;; Nat
routing-table ;; Skeleton
facets ;; (MutableHash FID Facet)
actors ;; (MutableHash FID Any) ;; maps FID to actor name
actors ;; (MutableHash ActorID Any) ;; maps ActorID to actor name
assertions ;; (Bagof Assertion)
dataflow ;; DataflowGraph
pending-scripts ;; (MutableVectorof (Queueof (-> Any)))
@ -41,7 +45,7 @@
)
#:transparent)
(struct facet (id ;; FID
(struct facet (fid ;; FID
endpoints ;; (MutableHash EID Endpoint)
[stop-scripts #:mutable] ;; (Listof Script) -- IN REVERSE ORDER
[children #:mutable] ;; (Setof FID)
@ -59,7 +63,7 @@
;; it on access.
(struct field-handle (name ;; Symbol
id ;; Nat
owner ;; FID
owner ;; ActorID
[value #:mutable] ;; Any
)
#:methods gen:custom-write
@ -135,36 +139,38 @@
(set-dataspace-next-id! ds (+ id 1))
id))
;; TODO: remove??
(define (fid-parent fid)
(cdr fid))
(match-define (facet-id actor (cons _ path)) fid)
(facet-id actor path))
(define (generate-fid! ds parent-fid)
(cons (generate-id! ds) parent-fid))
(define (actor-fid? fid)
(null? (fid-parent fid)))
(define (fid->actor-fid fid)
(if (actor-fid? fid)
fid
(fid->actor-fid (fid-parent fid))))
(match-define (facet-id actor path) parent-fid)
(facet-id actor (cons (generate-id! ds) path)))
(define (fid-ancestor? fid maybe-ancestor)
(and (pair? fid) ;; empty fid lists obviously no ancestors at all!
(or (equal? fid maybe-ancestor)
(fid-ancestor? (cdr fid) maybe-ancestor))))
(and (equal? (facet-id-actor fid) (facet-id-actor maybe-ancestor))
(let ((b-path (facet-id-path maybe-ancestor)))
(let walk ((a-path (facet-id-path fid)))
(and (pair? a-path) ;; empty fid lists obviously no ancestors at all!
(or (equal? a-path b-path)
(walk (cdr a-path))))))))
(define (has-parent? fid)
(pair? (cdr (facet-id-path fid))))
(define (add-actor! ds name boot-proc initial-assertions)
(define actor-fid (generate-fid! ds '()))
(hash-set! (dataspace-actors ds) actor-fid name)
(define actor-id (generate-id! ds))
(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
(hash-set! (dataspace-actors ds) actor-id name)
(for [(a initial-assertions)]
(match (bag-change! (dataspace-assertions ds) a 1)
['absent->present (add-assertion! (dataspace-routing-table ds) a)]
;; 'absent->absent and 'present->absent absurd
['present->present (void)])) ;; i.e. no visible change
(add-facet! ds #f actor-fid (lambda ()
(boot-proc)
(for [(a initial-assertions)] (dataspace-retract! ds a)))))
(add-facet! ds #f root-fid (lambda ()
(boot-proc)
(for [(a initial-assertions)] (dataspace-retract! ds a)))))
(define (lookup-facet ds fid)
(hash-ref (dataspace-facets ds) fid #f))
@ -176,7 +182,7 @@
(current-facet-id fid)
(in-script? script?))
(with-handlers ([(lambda (e) (not (exn:break? e)))
(lambda (e) (terminate-actor! ds (fid->actor-fid fid)))]) ;; TODO: tracing
(lambda (e) (terminate-actor! ds (facet-id-actor fid)))]) ;; TODO: tracing
body ...
(void)))))
@ -258,14 +264,15 @@
'()
(set)))
(hash-set! (dataspace-facets ds) fid f)
(when (pair? parent-fid)
(when (has-parent? fid)
(define pf (lookup-facet ds parent-fid))
(when pf (set-facet-children! pf (set-add (facet-children pf) fid))))
(with-current-facet [ds fid #f]
(boot-proc))
(schedule-script!* ds (lambda ()
(when (and (facet-live? ds fid)
(or (and (pair? parent-fid) (not (facet-live? ds parent-fid)))
(or (and (has-parent? fid)
(not (facet-live? ds parent-fid)))
(facet-live-but-inert? ds fid)))
(terminate-facet! ds fid)))))
@ -295,11 +302,9 @@
(when h (dataspace-unsubscribe! ds h))))))
;; Abruptly terminates an entire actor, without running stop-scripts etc.
(define (terminate-actor! ds actor-fid)
(when (not (actor-fid? actor-fid))
(error 'terminate-actor! "Attempt to terminate non-actor FID ~a" actor-fid))
(hash-remove! (dataspace-actors ds) actor-fid)
(let abort-facet! ((fid actor-fid))
(define (terminate-actor! ds actor-id)
(hash-remove! (dataspace-actors ds) actor-id)
(let abort-facet! ((fid (facet-id actor-id (list actor-id)))) ;; TODO: ugh
(define f (lookup-facet ds fid))
(when f
(hash-remove! (dataspace-facets ds) fid)
@ -312,7 +317,7 @@
(when f
(define parent-fid (fid-parent fid))
(when (pair? parent-fid)
(when (has-parent? fid)
(define pf (lookup-facet ds parent-fid))
(when pf (set-facet-children! pf (set-remove (facet-children pf) fid))))
@ -335,7 +340,7 @@
#:priority *gc-priority*
ds
(lambda ()
(if (pair? parent-fid)
(if (has-parent? fid)
(when (facet-live-but-inert? ds parent-fid) (terminate-facet! ds parent-fid))
(terminate-actor! ds fid))))))
@ -415,7 +420,7 @@
(lambda ()
(define current-value (field-handle 'current-value
(generate-id! (current-dataspace))
(fid->actor-fid (current-facet-id))
(facet-id-actor (current-facet-id))
0))
(add-endpoint! (current-dataspace)
'stop-when-ten