on-gestalt
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@ -10,7 +10,8 @@
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(provide (except-out (struct-out demand-matcher) demand-matcher)
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(rename-out [make-demand-matcher demand-matcher])
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demand-matcher-update
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spawn-demand-matcher)
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spawn-demand-matcher
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on-gestalt)
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;; A DemandMatcher keeps track of demand for services based on some
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;; Projection over a Gestalt, as well as a collection of functions
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@ -114,3 +115,35 @@
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d
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(gestalt-union (sub observer-pattern #:meta-level meta-level #:level observer-level)
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(pub observer-pattern #:meta-level meta-level #:level observer-level))))
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;; (Gestalt (Option (Setof (Listof Value))) ... -> (Option (Constreeof Action)))
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;; Gestalt GestaltProjection ...
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;; -> Action
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;; Spawns a process that observes the given projections. Any time the
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;; environment's gestalt changes in a relevant way, calls
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;; check-and-maybe-spawn-fn with the aggregate gestalt and the
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;; projection results. If check-and-maybe-spawn-fn returns #f,
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;; continues to wait; otherwise, takes the action(s) returned, and
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;; quits.
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(define (on-gestalt check-and-maybe-spawn-fn
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base-gestalt
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. gestalt-projections)
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(define aggregate-gestalt
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(apply gestalt-union
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base-gestalt
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(map projection->gestalt gestalt-projections)))
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(spawn (lambda (e s)
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(match e
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[(routing-update g)
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(define projection-results
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(map (lambda (p) (gestalt-project/keys g p)) gestalt-projections))
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(define maybe-spawn (apply check-and-maybe-spawn-fn
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aggregate-gestalt
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projection-results))
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(and maybe-spawn
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(transition s
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(list maybe-spawn
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(quit))))]
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[_ #f]))
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(void)
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aggregate-gestalt))
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