job.rb

require "em-http-request"

WORDS = %w( Lorem ipsum dolor sit amet, consectetur adipiscing elit. Fusce pharetra ullamcorper sodales. Proin nisi velit, venenatis nec dapibus non, molestie quis orci. Etiam eget enim massa, quis ultricies sapien )

module GetGuido
  module Jobs
    class Http
      @queue = :default

      def self.perform
        EM::run do
          pending = 0
          20.times do
            pending += 1

            word = WORDS[pending]
            puts "Start: %s" % word

            EM::HttpRequest.new("http://www.onet.pl").get.callback do |http|
              puts "End: %s" % word

              pending -= 1
              EM::stop if pending == 0
            end
          end
        end
      end
    end
  end
end

Output

Start: ipsum
Start: dolor
Start: sit
Start: amet,
Start: consectetur
Start: adipiscing
Start: elit.
Start: Fusce
Start: pharetra
Start: ullamcorper
Start: sodales.
Start: Proin
Start: nisi
Start: velit,
Start: venenatis
Start: nec
Start: dapibus
Start: non,
Start: molestie
Start: quis
End: ullamcorper
End: velit,
End: nisi
End: sit
End: adipiscing
End: elit.
End: Proin
End: quis
End: nec
End: non,
End: sodales.
End: Fusce
End: ipsum
End: amet,
End: dolor
End: pharetra
End: consectetur
End: venenatis
End: molestie
End: dapibus