module PersistentMemoize

Constants

VERSION

Public Instance Methods

memoize(name, path) click to toggle source

Memoize the method ‘name’, with results stored in files under ‘path’

Calls superclass method

# File lib/persistent_memoize.rb, line 7
def memoize(name, path)
  unless File.exists?(path)
    FileUtils.mkdir_p(path)
  end

  (class<<self; self; end).send(:define_method, name) do |*args|
    key = Digest::MD5.hexdigest(Marshal.dump(args))
    cacheFile = File.join(path, key)
    if File.exists?(cacheFile)
      results = File.open(cacheFile, 'rb'){ |f| Marshal.load(f) }
    else
      results = super(*args)
      File.open(cacheFile, 'wb'){ |f| Marshal.dump(results, f) }
    end
    results
  end

end