wisper blocks publisher according to subscriber's process

wisper-blocks.rb

require "wisper"
require "date"

class MyPublisher
  include Wisper::Publisher

  def tick(time)
    publish(:tack, time)
  end
end


if __FILE__ == $0

  my_publisher = MyPublisher.new

  my_publisher.on(:tack) do |time|
    p time
    sleep 1
  end

  5.times do
    my_publisher.tick(Time.now)
    sleep 1
  end

end

=begin

Result:
  $ bundle exec ruby main.rb
  2014-07-08 08:27:14 +0900
  2014-07-08 08:27:16 +0900
  2014-07-08 08:27:18 +0900
  2014-07-08 08:27:20 +0900
  2014-07-08 08:27:22 +0900

MyListener blocks the subsequent processes ...

=end