76 lines
2.7 KiB
Racket
76 lines
2.7 KiB
Racket
#lang syndicate
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;; Demonstrate handling of facet termination.
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;;
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;; Prior to early November, 2016, only a *single* stop-when was able
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;; to respond to a given termination event. Any others that happened
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;; to match would not fire; any `on` clauses may or may not fire,
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;; nondeterministically.
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;;
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;; Since then, I've altered the termination protocol to honour one of
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;; the core Syndicate design ideas: that a single event goes to *all*
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;; interested parties. The upshot of this, in this context, is that
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;; given an event E, *all* `on E` and `stop-when E` should fire.
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;;
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;; See emails sent around the 6th October, and uni.org entry of 7
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;; November.
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(require racket/pretty)
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(struct milestone (facet-id message) #:prefab)
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(struct presence (detail) #:prefab)
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(define (milestone! . detail)
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(printf ">>> ~v ~v\n" (current-facet-id) detail)
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(send! (milestone (current-facet-id) detail)))
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(spawn (field [trace-rev '()])
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(define (push! w x) (trace-rev (cons (list w x) (trace-rev))))
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(on-start
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(until (asserted (observe 'E)))
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(send! 'E)
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(until (retracted (observe 'E)))
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(flush!)
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(flush!)
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(flush!)
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(pretty-print (reverse (trace-rev))))
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(on (asserted (presence $p)) (push! '+ (presence p)))
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(on (retracted (presence $p)) (push! '- (presence p)))
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(on (message (milestone $w $d)) (push! '! (milestone w d))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(spawn
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(assert (presence 'outer))
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(on-start (milestone! 'on-start 'outer))
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(on-stop (milestone! 'on-stop 'outer))
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(on-start
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(react
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(assert (presence 'inner))
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(on-start (milestone! 'on-start 'inner))
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(on-stop (milestone! 'on-stop 'inner))
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(on (message 'E)
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(milestone! 'on-E 'inner 'pre-stop)
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(stop-facet (current-facet-id)
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(milestone! 'on-E 'inner 'post-stop))
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(milestone! 'on-E 'inner 'mid-stop))
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(stop-when (message 'E)
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(milestone! 'stop-when 'inner 'pre-innermost)
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(react (assert (presence 'innermost))
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(on-start (milestone! 'on-start 'innermost))
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(on-stop (milestone! 'on-stop 'innermost))
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(on (rising-edge #t) (milestone! 'on-rising-edge 'innermost))
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(stop-when (rising-edge #t) (milestone! 'stop-when-rising-edge 'innermost))
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(stop-when (message 'E)
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(milestone! 'stop-when 'innermost 'SHOULD-NEVER-HAPPEN)))
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(milestone! 'stop-when 'inner 'post-innermost))))
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(on (message 'E)
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(milestone! 'on-E 'outer 'pre-stop)
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(stop-facet (current-facet-id)
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(milestone! 'on-E 'outer 'post-stop))
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(milestone! 'on-E 'outer 'mid-stop)))
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