176 lines
6.1 KiB
Scheme
176 lines
6.1 KiB
Scheme
;;;
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;;; RULE
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;;;
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;;; (make-rule prereqs wants-build? build-func) ---> rule
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;;;
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;;; prereqs: '(#{:rule} ...)
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;;; wants-build?: (lambda (res-p0 res-p1 ... res-pN init-state) body ...)
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;;; res-pX: result of prerequisite-rule no. X
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;;; (wants-build? res-p0 ... res-pN init-state)
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;;; ---> (res-wants-build? . cooked-state)
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;;; build-func:
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;;; (lambda (res-wants-build? res-p0 ... res-pN cooked-state)
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;;; ---> (res-build-func . end-state)
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;;;
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(define-record-type :rule
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(make-rule prereqs wants-build? build-func)
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is-rule?
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(prereqs rule-prereqs)
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(wants-build? rule-wants-build?)
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(build-func rule-build-func))
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;;;
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;;; RULE-SET
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;;;
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;;; (make-empty-rule-set) ---> rule-set
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;;; (rule-set-add rule rule-set) ---> rule-set
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;;;
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(define-record-type :rule-set
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(make-rule-set rules)
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is-rule-set?
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(rules rule-set-rules))
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(define (make-empty-rule-set)
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(make-rule-set '()))
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(define (rule-set-add rule rule-set)
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(let ((listen-ch (collect&reply/make-channel)))
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(if (not (assq rule (rule-set-rules rule-set)))
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(make-rule-set (alist-cons rule listen-ch (rule-set-rules rule-set)))
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(error "make-rule: rule already exists."))))
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(define (rule-set-get-listen-ch rule rule-set)
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(let ((maybe-rule (assoc rule (rule-set-rules rule-set))))
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(if (and maybe-rule
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(pair? maybe-rule)
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(is-collect&reply-channel? (cdr maybe-rule)))
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(cdr maybe-rule)
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(error "rule not found in rule-set."))))
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;;;
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;;; RULE-RESULT
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;;;
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;;; (rule-result-wants-build? rule-result) --->
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;;; (wants-build?-result . cooked-state) oder (#f . cooked-state)
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;;;
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;;; (rule-result-build-func rule-result) --->
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;;; (build-func-result . end-state) oder #f
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;;;
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;;; (rule-make rule init-state rule-set) ---> rule-result
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;;;
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(define-record-type :rule-result
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(make-rule-result wants-build?-result build-func-result)
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is-rule-result?
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(wants-build?-result rule-result-wants-build?)
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(build-func-result rule-result-build-func))
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(define (rule-make rule init-state rule-set)
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(map (lambda (r)
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(rule-node r (rule-set-get-listen-ch r rule-set) init-state rule-set))
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(map car (rule-set-rules rule-set)))
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(let* ((server (rule-set-get-listen-ch rule rule-set))
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(client (send&collect/make-channel))
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(link (make-link client server))
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(recipient (car link)))
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(send&collect/send client (make-tagged-msg recipient (rule-cmd make)))
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(let ((res (tagged-msg-stripped (send&collect/receive client))))
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; (send&collect/send client (make-tagged-msg recipient (rule-cmd shutdown)))
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res)))
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(define-enumerated-type rule-cmd :rule-cmd
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is-rule-cmd?
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the-rule-cmds
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rule-cmd-name
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rule-cmd-index
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(make link shutdown))
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;;; this only works if there are no duplicates in list
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(define (position< maybe-lesser maybe-greater objects)
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(if (null? objects)
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(error "position< has empty objects-list.")
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(let search-objects ((current (car objects))
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(todo (cdr objects)))
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(cond
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((= (tagged-msg-tag maybe-lesser) current) #t)
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((= (tagged-msg-tag maybe-greater) current) #f)
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((null? todo)
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(error "position<: maybe-lesser or maybe-greater not found."
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maybe-lesser maybe-greater))
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(else (search-objects (car todo) (cdr todo)))))))
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(define (rule-node/sort-msgs unsorted to-order)
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(map tagged-msg-stripped
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(sort (lambda (maybe-lesser maybe-greater)
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(position< maybe-lesser maybe-greater to-order))
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unsorted (list))))
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;;; (define (rule-node/prereqs-results rule connect-ch recipients)
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;;; (let ((unsorted-msgs (map (lambda (recipient)
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;;; (let ((tmsg (make-tagged-msg recipient
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;;; (rule-cmd make))))
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;;; (send&collect/send connect-ch tmsg)
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;;; (send&collect/receive connect-ch)))
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;;; recipients)))
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;;; (rule-node/sort-msgs unsorted-msgs recipients)))
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(define (rule-node/prereqs-results rule connect-ch recipients)
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(for-each (lambda (recipient)
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(let ((tmsg (make-tagged-msg recipient (rule-cmd make))))
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(send&collect/send connect-ch tmsg)))
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recipients)
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(let ((unsorted-msgs (map (lambda (ignore)
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(send&collect/receive connect-ch))
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recipients)))
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(rule-node/sort-msgs unsorted-msgs recipients)))
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(define (rule-node/make rule listen-ch connect-ch recipients init-state)
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(let ((prereqs-results (rule-node/prereqs-results rule connect-ch recipients)))
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(let ((wants-build?-result (if (null? prereqs-results)
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((rule-wants-build? rule) init-state)
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(apply (rule-wants-build? rule)
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(append prereqs-results
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(list init-state))))))
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(let ((build-required? (car wants-build?-result))
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(cooked-state (cdr wants-build?-result)))
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(if build-required?
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(let* ((build-func (rule-build-func rule))
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(build-func-result (if (null? prereqs-results)
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(build-func build-required? cooked-state)
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(apply build-func
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(append (list build-required?)
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prereqs-results
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(list cooked-state)))))
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(end-state (cdr build-func-result)))
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(make-rule-result wants-build?-result build-func-result))
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(make-rule-result wants-build?-result #f))))))
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(define (rule-node/make-links rule connect-ch rule-set)
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(let ((listen-chs (map (lambda (prereq-rule)
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(cdr (assoc prereq-rule (rule-set-rules rule-set))))
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(rule-prereqs rule))))
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(map (lambda (listen-ch)
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(make-link connect-ch listen-ch))
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listen-chs)))
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(define (rule-node rule listen-ch init-state rule-set)
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(let* ((connect-ch (send&collect/make-channel))
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(get-rcpts (lambda ()
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(map car (rule-node/make-links rule connect-ch rule-set))))
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(do-answer (lambda (tmsg rcpts)
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(let* ((sender (tagged-msg-tag tmsg))
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(cmd (tagged-msg-stripped tmsg))
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(result (rule-node/make rule listen-ch connect-ch
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rcpts init-state))
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(reply (make-tagged-msg sender result)))
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(collect&reply/send listen-ch reply)))))
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(spawn
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(lambda ()
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(let node-loop ((tmsg (collect&reply/receive listen-ch))
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(rcpts (get-rcpts)))
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(cond
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((eq? (rule-cmd-name (tagged-msg-stripped tmsg)) 'make)
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(do-answer tmsg rcpts))
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(else (error "rule-node: no match")))
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(node-loop (collect&reply/receive listen-ch) rcpts)))
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'rule-node)))
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