Gemfile

source 'https://rubygems.org'

gem 'celluloid-io', :git => 'https://github.com/celluloid/celluloid-io.git'
gem 'celluloid', :git => 'https://github.com/celluloid/celluloid.git'
gem 'reel',:git => 'https://github.com/celluloid/reel.git'

server.rb

require 'reel'
require 'test_actor'

class MyServer < Reel::Server
  def initialize(host = "127.0.0.1", port = 3000)

    @actor_pool = TestActor.pool(size: 2)
    # or:
    # @actor_pool = TestActor.new
    # to reproduce https://github.com/celluloid/celluloid-io/issues/46 
    super(host, port, &method(:on_connection))
  end

  def on_connection(connection)
    while request = connection.request
      case request
        when Reel::Request
          connection.detach
          handle_request(request)
        when Reel::WebSocket
          handle_websocket(request)
      end
    end
  end

  def handle_request(request)
    @actor_pool.fire do |response|
      request.respond :ok, response
    end
  end

  def handle_websocket(sock)
    sock << "Hello everyone out there in WebSocket land!"
    sock.close
  end
end

puts "Starting server..."
MyServer.run

test_actor.rb

require 'celluloid'

class TestActor
  include Celluloid

  def fire
    yield "The time on my actor #{Thread.current.inspect} is #{Time.now}"
  end

end