# test 대상 class
class Mailer

  def self.deliver(&block)
    mail = MailBuilder.new(&block).mail
    mail.send_mail
  end

  Mail = Struct.new(:from, :to, :subject, :body) do 
    def send_mail
      fib(30)
      puts "Email from: #{from}"
      puts "Email to  : #{to}"
      puts "Subject   : #{subject}"
      puts "Body      : #{body}"
    end

    def fib(n)
      n < 2 ? n : fib(n-1) + fib(n-2)
    end  
  end

  class MailBuilder
    def initialize(&block)
      @mail = Mail.new
      instance_eval(&block)
    end
    
    attr_reader :mail

    %w(from to subject body).each do |m|
      define_method(m) do |val|
        @mail.send("#{m}=", val)
      end
    end
  end
end

#------------------------------------------------------------------------------------------------

# single - 8초 정도 소요
require 'benchmark'
require './mailer'

puts Benchmark.bm { |x|
  x.report('single') do
    100.times do |i|
    Mailer.deliver do
      from    "eki_#{i}@eqbalq.com"
      to      "jill_#{i}@example.com"
      subject "Threading and Forking (#{i})"
      body    "Some content"
    end
    end
  end
}

# thread - 8초 정도 소요
require 'benchmark'
require './mailer'

puts Benchmark.bm { |x|
  threads = []
  x.report('thread') do
    100.times do |i|
      threads << Thread.new do
        Mailer.deliver do
          from    "eki_#{i}@eqbalq.com"
          to      "jill_#{i}@example.com"
          subject "Threading and Forking (#{i})"
          body    "Some content"
        end
      end
    end
    threads.map(&:join)
  end
}

# process - 약 2초 정도 소요(4core)
require 'benchmark'
require './mailer'

puts Benchmark.measure{
  100.times do |i|
    fork do
      Mailer.deliver do
        from    "eki_#{i}@eqbalq.com"
        to      "jill_#{i}@example.com"
        subject "Threading and Forking (#{i})"
        body    "Some content"
      end
    end
  end
  Process.waitall
}

# jruby 9.1.5.0 으로 multi thread 실행시(no option) 약 3.x ~ 4.x초 정도 소요

# jruby 9.1.5.0 으로 multi thread 실행시(no option) jit 활성화 하도록 Benchmark.bmbm(두번 실행한 후 두번째 결과만을 출력) 한 경우
# 약 1.7 ~ 2초 정도 소요
require 'benchmark'
require './mailer'

puts Benchmark.bmbm { |x|
  threads = []
  x.report('thread') do
    100.times do |i|
      threads << Thread.new do
        Mailer.deliver do
          from    "eki_#{i}@eqbalq.com"
          to      "jill_#{i}@example.com"
          subject "Threading and Forking (#{i})"
          body    "Some content"
        end
      end
    end
    threads.map(&:join)
  end
}

# jruby 9.1.5.0 으로 multi thread 실행시(invokeDynamic option 준 경우) -Xcompile.invokedynamic=true
# 약 0.7 ~ 0.8 초 소요