actionmailer/lib/action_mailer/async.rb


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require 'delegate'

module ActionMailer::Async
  def method_missing(method_name, *args)
    if action_methods.include?(method_name.to_s)
      QueuedMessage.new(queue, self, method_name, *args)
    else
      super
    end
  end

  def queue
    Rails.queue
  end

  class QueuedMessage < ::Delegator
    attr_reader :queue

    def initialize(queue, mailer_class, method_name, *args)
      @queue        = queue
      @mailer_class = mailer_class
      @method_name  = method_name
      @args         = args
    end

    def __getobj__
      @actual_message ||= @mailer_class.send(:new, @method_name, *@args).message
    end

    def run
      __getobj__.deliver
    end

    # Will push the message onto the Queue to be processed
    def deliver
      @queue << self
    end
  end
end