require 'eventmachine'

class NFuture
    include EM::Deferrable
    def initialize(times, &block)
        @times = times
        self.callback(&block)
    end

    def one_more_time(*arg)
        @times -= 1
        self.succeed(*arg) if @times == 0
    end
end

n = NFuture.new 5 do
    print "beuha"
    EM.stop
end

EM.run do
    (1..5).each do |i|
        EM.add_timer(Random.rand(0.1)) do
            puts i
            n.one_more_time
        end
    end
end