Application.start_phase
You're seeing just the callback
start_phase
, go back to Application module for more information.
Specs
start_phase(phase :: term(), start_type(), phase_args :: term()) :: :ok | {:error, reason :: term()}
Starts an application in synchronous phases.
This function is called after start/2
finishes but before
Application.start/2
returns. It will be called once for every start phase
defined in the application's (and any included applications') specification,
in the order they are listed in.