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Designing Elixir Systems with OTP

Adding Notifications to Mastery and the Boundary

Let’s start working on the notifications to start and end our quizzes.

We'll cover the following...

Adding a notification to start the quiz

Let’s add the notification to start_quiz in proctor.ex:

C++
  def start_quiz(quiz, now) do
    Logger.info "Starting quiz #{quiz.fields.title}..."
    notify_start(quiz)
    QuizManager.build_quiz(quiz.fields)
    Enum.each(quiz.templates, &add_template(quiz, &1))
    timeout = DateTime.diff(quiz.end_at, now, :millisecond)
    Process.send_after(
      self(), 
      {:end_quiz, quiz.fields.title, quiz.notify_pid}, 
      timeout)
  end

In start_quiz, we have two changes to make:

  • After we log the start of the quiz, we call our new notify_start function, where we’ll do the notification via send.

  • Next, ...