gistfile1.rb

class Comet < Sinatra::Base
  register Sinatra::Async
  
  @@pool = []
  
  aget '/observe' do
    @@pool.push self
  end
  
  aget '/notify' do
    @@pool.each {|observer| observer.body { "hi!" } }
    @@pool = []
    body "sent!"
  end
end