From: MenTaLguY <mental@...>
Date: 2007-05-25T13:10:40+09:00
Subject: [ANN] Actors for Ruby: The Omnibus Concurrency Library 0.1

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With all the recent interest in Erlang, I've decided to bump up the
release schedule of my Omnibus Concurrency Library.  It provides a
Ruby-esque implementation of actors, as well as a few other concurrency
approaches (data-parallel programming and futures, to begin with).

This first release is a very rough cut, featuring an MRI port of the
Actors implementation I wrote for the Rubinius core.  I'm afraid there's
no documentation yet, so I'll give some brief examples:

 require 'concurrent/actors'
 include Concurrent::Actors

 RequestGreeting =3D Struct.new :reply_to
 Greeting =3D Struct.new :value

 # spawning a new actor
 oracle =3D Actor.spawn do
   greeting =3D "Hello"
   loop do
     # guarded receive (does case-like matching via #=3D=3D=3D)
     Actor.receive do |f|
       f.when Greeting do |m|
         greeting =3D m.value.dup.freeze
       end
       # callback part 1
       f.when RequestGreeting do |m|
         m.reply_to << Greeting[greeting]
       end
     end
   end
 end

 # sending a message to an actor
 oracle << Greeting["Howdy"]

 # getting a reference to the current actor
 current =3D Actor.current

 # callback part 2
 oracle << RequestGreeting[current]
 Actor.receive do |f|
   f.when Greeting do |m|
     puts "#{ m.value }, Bill!"
   end
 end

Linked processes, distributed actors, and possible integration with
Erlang/Erlectricity are planned for the future.

The Omnibus Concurrency Library is available via RubyGems as the
"concurrent" gem, and downloads are also available from the RubyForge
download page:

  http://rubyforge.org/frs/?group_id=3D3690

-mental

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