25 lines
922 B
Racket
25 lines
922 B
Racket
#lang syndicate/core
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;; Simple mutable box and count-to-infinity box client.
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(struct set-box (new-value) #:transparent)
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(struct box-state (value) #:transparent)
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(actor (lambda (e current-value)
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(match-event e
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[(message (set-box new-value))
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(log-info "box: taking on new-value ~v" new-value)
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(transition new-value (patch-seq (retract (box-state current-value))
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(assert (box-state new-value))))]))
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0
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(patch-seq (sub (set-box ?))
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(assert (box-state 0))))
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(actor (lambda (e s)
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(match-event e
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[(patch added removed)
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(transition s (for-trie/list ([(box-state $v) added])
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(log-info "client: learned that box's value is now ~v" v)
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(message (set-box (+ v 1)))))]))
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(void)
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(patch-seq (sub (box-state ?))))
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