From: "Shot (Piotr Szotkowski)" <shot@...>
Date: 2008-05-19T05:03:07+09:00
Subject: How to wrap either forkoff or map depending on a config variable?

--ee6FjwWxuMujAVRe
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

Hello, good people of ruby-talk.

I=E2=80=99m trying to write an Enumerable#parallel method that, depending on
a config option (retrieved inside it) would end up being an alias for
either Enumerable#map or Enumerable#forkoff.

(I know calling enum.forkoff(1) should equal enum.map, but I need
the wrapper to call #map, as forkoff doesn=E2=80=99t work under JRuby.)

I=E2=80=99m quite new to the idea of blocks/closures, and while I love using
them, I=E2=80=99m still not sure how to write such a method. What I=E2=80=
=99m looking
for is something like this:

module Enumerable
  def parallel &block
    if Config.processes =3D=3D 1
      # call map with the passed block
    else
      # call forkoff with the passed block
    end
  end
end

Ideally, the call to forkoff would pass Config.processes as its
first param =E2=80=93 i.e., calling enum.parallel {=E2=80=A6} would mean ca=
lling
enum.forkoff(Config.processes) {=E2=80=A6}

-- Shot
--=20
An Emacs reference mug is what I want. It would hold
ten gallons of coffee.     -- Steve VanDevender, asr

--ee6FjwWxuMujAVRe
Content-Type: application/pgp-signature
Content-Disposition: inline

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.2.2 (GNU/Linux)

iD8DBQFIMIz3i/mCfdEo8UoRAuXqAKCIuD9sPyFdcr4eERZl49yWnjU6awCdFd9J
LgcFNsx7GKr3UpRgr7i140Q=
=fr2j
-----END PGP SIGNATURE-----

--ee6FjwWxuMujAVRe--