with-cache is a small package for saving the results of an expression to
the filesystem
#lang racket/base
(require pict with-cache)
(define (get-fish)
(with-cache (cachefile "stdfish.rktd")
(λ () (standard-fish 100 50))))
(get-fish) ;; Builds a fish
(get-fish) ;; Reads a fish from "./compiled/with-cache/stdfish.rktd"
Run the above with `racket -W info@with-cache file.rkt` to see when cache
files get written and read.
By default, cached data is serialized, written in fasl format, and
invalidated if read by a different version of the with-cache library. You
can override all these options; the docs should explain how.
Docs (latest update is yet to sync on the package server):
http://docs.racket-lang.org/with-cache/index.html
Code:
https://github.com/bennn/with-cache
History:
I started writing this code while working on a Scribble document with lots
of picts in it. (Most of the picts were made by plot. Tweaking plot
parameters led to the *current-cache-keys* parameter.)
William Bowman encouraged me to put an early version of this code on the
package server.
Leif Andersen pointed out LOTS of places where the original code needed to
improve.
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