proper_registry_supervisor why have init function? about elixir-in-action HOT 2 CLOSED

I presume you're asking why not use Supervisor.start_link/2, and avoid defining callbacks, right?

We could indeed simplify this module as:

defmodule Todo.SystemSupervisor do
  def start_link do
    import Supervisor.Spec
    
    Supervisor.start_link(
      [
        supervisor(Todo.Database, ["./persist/"]),
        supervisor(Todo.ServerSupervisor, []),
        worker(Todo.Cache, [])
      ],
      strategy: :one_for_one
    )
  end
end

And this is how I'd usually do it myself.

The main (well, the only) reason I didn't reach for that in the book is because I was worried people will be confused with this different form. It was more important for me to focus on how to organize supervision trees, than to show every aspect of the Supervisor API.

That said, I will consider discussing this approach in the next edition.

from elixir-in-action.

Going to close as it has been a long time and I'm not sure if this is relevant anymore.

from elixir-in-action.