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Designing Elixir Systems with OTP

Adding Notifications to Mastery and the Boundary

Explore how to integrate notifications into an Elixir project by modifying the quiz lifecycle events. Understand how to send notifications when a quiz starts and ends through process message passing, improving your skill in managing communication within OTP boundaries and enhancing user interaction feedback.

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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, ...