61 lines
2.9 KiB
Racket
61 lines
2.9 KiB
Racket
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#lang racket/base
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(provide (all-from-out "schemas/gen/dataspace.rkt")
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(all-from-out "schemas/gen/dataspace-patterns.rkt")
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(all-from-out "schemas/gen/dataspace-patterns.meta.rkt")
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dataspace)
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(require racket/match)
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(require preserves)
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(require "bag.rkt")
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(require "main.rkt")
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(require "schemas/gen/dataspace.rkt")
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(require "schemas/gen/dataspace-patterns.rkt")
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(require "schemas/gen/dataspace-patterns.meta.rkt")
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(define (dataspace)
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(define handles (make-hash))
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(define assertions (make-bag))
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(define subscriptions (make-hash))
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(entity #:assert (action (rec handle)
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(log-info "+ ~v ~v" handle rec)
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(when (record? rec)
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(hash-set! handles handle rec)
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(when (eq? (bag-change! assertions rec +1) 'absent->present)
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(match (parse-Observe rec)
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[(? eof-object?) (void)]
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[(Observe label observer)
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(define seen (make-hash))
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(hash-set! (hash-ref! subscriptions label make-hasheq) observer seen)
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(for [(existing (in-bag assertions))]
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(when (preserve=? (record-label existing) label)
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(hash-set! seen existing (turn-assert! this-turn observer existing))))])
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(for [((observer seen) (in-hash (hash-ref subscriptions (record-label rec) '#hash())))]
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(unless (hash-has-key? seen rec)
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(hash-set! seen rec (turn-assert! this-turn observer rec)))))))
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#:retract (action (upstream-handle)
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(define rec (hash-ref handles upstream-handle #f))
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(log-info "- ~v ~v" upstream-handle rec)
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(when rec
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(hash-remove! handles upstream-handle)
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(when (eq? (bag-change! assertions rec -1) 'present->absent)
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(for [(seen (in-hash-values (hash-ref subscriptions (record-label rec) '#hash())))]
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(turn-retract! this-turn (hash-ref seen rec))
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(hash-remove! seen rec))
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(match (parse-Observe rec)
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[(? eof-object?) (void)]
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[(Observe label observer)
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(let ((subscribers (hash-ref subscriptions label)))
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(hash-remove! subscribers observer)
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(when (hash-empty? subscribers)
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(hash-remove! subscriptions label)))]))))
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#:message (action (message)
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(log-info "! ~v" message)
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(when (record? message)
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(for [(peer (in-hash-keys (hash-ref subscriptions (record-label message) '#hash())))]
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(turn-message! this-turn peer message))))))
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