gistfile1.rb

wq = WorkQueue.new(5)

i = 1
Dir.new(DIRECTORY).each do |file|
  i2 = i
  unless file.start_with?('.')
    wq.enqueue_b do
      move file to another directory
      ImportFile.new(file, i2).run
    end
  end

  i += 1
end

wq.join

===

class ImportFile
  def initialize(file, number)
    puts "In InputFile"
  end

  def run
    puts "Processing file"
  end
end