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Designing Elixir Systems with OTP

Modifying the Boundary of the Mastery Project

Let’s learn to make changes to our API in Mastery to enable notifications for starting and stopping our quizzes.

We'll cover the following...

We’ll start with /lib/mastery.ex to make the API changes, enabling that new API in the boundary.

Modifying the API

In Mastery, we need to change the API to accept our new notify_pid, like this:

C++
  def schedule_quiz(quiz, templates, start_at, end_at, notify_pid \\ nil) do 
    with :ok <- QuizValidator.errors(quiz),
      true <- Enum.all?(templates, &(:ok == TemplateValidator.errors(&1))), 
      :ok <-
         Proctor.schedule_quiz(
           quiz,
           templates,
           start_at,
           end_at,
           notify_pid),
    do: :ok, else: (error -> error) 
  end

That’s simple enough:

  • We add a new optional argument to ...