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Using immutable hash vs alist

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svn: r11425
This commit is contained in:
Jay McCarthy 2008-08-25 18:13:29 +00:00
parent ee42d18e6b
commit 9cb82aebf3
1 changed files with 10 additions and 30 deletions
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40
collects/web-server/lang/web-cells.ss
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@ -1,8 +1,5 @@
#lang scheme/base #lang scheme
(require mzlib/serialize (require scheme/serialize
mzlib/list
mzlib/plt-match
mzlib/contract
"../private/closure.ss") "../private/closure.ss")
;; Implementation: Have a distinguished frame variable that is read and captured by send/suspend, ;; Implementation: Have a distinguished frame variable that is read and captured by send/suspend,
;; installed on invocations of continuations by the server (and NOT from other continuation invocations) ;; installed on invocations of continuations by the server (and NOT from other continuation invocations)
@ -11,28 +8,8 @@
(define-serializable-struct primitive-wc (id)) (define-serializable-struct primitive-wc (id))
(define-serializable-struct frame (env)) (define-serializable-struct frame (env))
;; Environment
(define empty-env empty)
(define env-lookup
(match-lambda*
[(list id (list))
(error 'web-cell "Undefined web-cell: ~e" id)]
[(list id (list-rest (list-rest a-id a-val) env))
(if (eq? id a-id)
a-val
(env-lookup id env))]))
(define env-replace
(match-lambda*
[(list id val (list))
(list (cons id val))]
[(list id val (list-rest (list-rest a-id a-val) env))
(if (eq? id a-id)
(list* (cons id val) env)
(list* (cons a-id a-val)
(env-replace id val env)))]))
;; Frames ;; Frames
(define *wc-frame* (make-thread-cell (make-frame empty-env) #t)) (define *wc-frame* (make-thread-cell (make-frame (make-immutable-hasheq empty)) #t))
(define (current-frame) (thread-cell-ref *wc-frame*)) (define (current-frame) (thread-cell-ref *wc-frame*))
(define (update-frame! nf) (thread-cell-set! *wc-frame* nf)) (define (update-frame! nf) (thread-cell-set! *wc-frame* nf))
@ -68,14 +45,17 @@
wc) wc)
(define (web-cell-ref pwc) (define (web-cell-ref pwc)
(env-lookup (primitive-wc-id pwc) (define i (primitive-wc-id pwc))
(frame-env (current-frame)))) (hash-ref
(frame-env (current-frame)) i
(lambda ()
(error 'web-cell "Undefined web-cell: ~e" i))))
(define (web-cell-shadow wc nv) (define (web-cell-shadow wc nv)
(update-frame! (update-frame!
(make-frame (make-frame
(env-replace (primitive-wc-id wc) nv (hash-set (frame-env (current-frame))
(frame-env (current-frame)))))) (primitive-wc-id wc) nv))))
(provide make-web-cell) (provide make-web-cell)
(provide/contract (provide/contract