28 lines
680 B
Racket
28 lines
680 B
Racket
#lang racket/base
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;; Advertisement assertions.
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(provide (struct-out advertise)
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advertisement
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pub
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unpub)
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(require racket/match)
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(require "../core.rkt")
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(require "../trie.rkt")
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(require "standard-relay.rkt")
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(struct advertise (claim) #:prefab)
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(define (drop-advertisement a)
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(match a
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[(advertise (inbound x)) (outbound (advertise x))]
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[_ a]))
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;; Monolithic SCN
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(define (advertisement pattern)
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(pattern->trie '<advertisement> (drop-advertisement (advertise pattern))))
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;; Incremental SCNs
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(define (pub pattern) (assert (drop-advertisement (advertise pattern))))
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(define (unpub pattern) (retract (drop-advertisement (advertise pattern))))
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