[Saint-P RubyConf 2018] AsyncAwait in Ruby

async_await.rb

# NOTE: gem install asynchronize
require "asynchronize"

module AsyncAwait
  refine Module do
    def async(mid)
      include Asynchronize unless included_modules.include?(Asynchronize)
      asynchronize mid
    end
  end

  refine Kernel do
    def await(*ths)
      if ths.size == 1
        ths.first.value
      else
        ths.map(&:value)
      end
    end
  end
end

require "benchmark"

using AsyncAwait

class A
  async def sleep!
    t = rand * 2
    sleep t
    t
  end
end

a = A.new
t = Benchmark.measure do
  p await(a.sleep!, a.sleep!).sum
end
p t.real