Behaviour Example

thinknetica_behaviour.ex

defmodule Tracker do
  @moduledoc """
  The `Tracker` behaviour declaring the interface for tracker backend.
  """

  @doc """
  The function to be called from tracked entity.
  """
  @callback track(binary(), any()) :: :ok

  @tracker Application.compile_env(:my_app, :tracker_backend, Tracker.Default)

  @doc "Router to the implementation"
  def track(uuid, entity), do: @tracker.track(uuid, entity)
end

defmodule Tracker.Default do
  @moduledoc false
  
  require Logger
  
  @behaviour Tracker
  
  @impl Tracker
  def track(uuid, entity), do: Logger.info(uuid <> ": " <> inspect(entity))
end