38 lines
928 B
Racket
38 lines
928 B
Racket
; SPDX-License-Identifier: LGPL-3.0-or-later
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; Copyright (C) 2010-2021 Tony Garnock-Jones <tonygarnockjones@gmail.com>
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#lang syndicate
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(provide turn-recorder
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extend-turn!
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commit-turn!
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reset-turn!)
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(require (submod "../dataspace.rkt" priorities))
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(define (extend-turn! t item) (t 'extend item))
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(define (commit-turn! t) (t 'commit))
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(define (reset-turn! t) (t 'reset))
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(define (turn-recorder on-commit)
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(field [commit-needed #f])
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(define items '())
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(define t
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(match-lambda*
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[(list 'extend item)
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(set! items (cons item items))
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(commit-needed #t)]
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[(list 'commit)
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(when (commit-needed)
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(on-commit (reverse items))
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(reset-turn! t))]
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[(list 'reset)
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(set! items '())
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(commit-needed #f)]
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[(list 'debug)
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(reverse items)]))
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(begin/dataflow
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#:priority *idle-priority*
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(commit-turn! t))
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t)
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