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<logger-generic> をカスタマイズして、ログ出力の on/off を切り替える。

(use srfi-1)
(use gauche.time)

(define-class <logger-generic> (<generic>)
              ((printlog :init-value #f) ; スロットにログ出力フラグを追加
              ()))

(define-method apply-generic ((gf <logger-generic>) args)
               ; ログ出力制御
               (if (ref gf 'printlog)
                   (begin
                     (format #t "args: ~s\n" args)
                     (let ((return-value (next-method)))
                          (format #t "result: ~s\n" return-value)
                          return-value))
                   (next-method)))

(define-class <profiler-generic> (<logger-generic>)
              ((counter :init-value 0)
               (time    :init-form (make <real-time-counter>))))

(define-generic sub :class <profiler-generic>)

(define-method apply-generic ((gf <profiler-generic>) args)
               (inc! (ref gf 'counter))
               (with-time-counter (ref gf 'time) (next-method)))

(define-method sub ((num1 <number>) (num2 <number>))
               (- num1 num2))

(define-method get-profile ((gf <profiler-generic>))
               (format #t "~s: ~d times called and spent time ~d\n"
                       (ref gf 'name) (ref gf 'counter) (time-counter-value (ref gf 'time))))

(define-method init-profile ((gf <profiler-generic>))
               (set! (ref gf 'counter) 0)
               (set! (ref gf 'time) (make <real-time-counter>)))

実行結果

ログ出力有りの場合

(set! (ref sub 'printlog) #t)
(init-profile sub)
(map sub (iota 10000 100 3) (iota 10000 300 5))
gosh> args: (100 300)
result: -200
args: (103 305)
result: -202
...
args: (30097 50295)
result: -20198
(-200 -202 -204 -206 ... -20198)
(get-profile sub)
gosh> sub: 10000 times called and spent time 0.22919099999994788

ログ出力無しの場合

(set! (ref sub 'printlog) #f)
(init-profile sub)
(map sub (iota 10000 100 3) (iota 10000 300 5))
(get-profile sub)
gosh> (-200 -202 -204 ... -20198)
gosh> sub: 10000 times called and spent time 0.14352999999999677

プログラミングGauche

posted with amazlet at 08.11.14

Kahuaプロジェクト
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