Boot an Elixir application step by step (inspired by RabbitMQ)
OTHER License
Complex applications can be composed of multiple subsystems or groups or processes, independants or dependants of
each others. And starting theses subsystems is not easy as :application.start/2
or a supervisor child spec.
Booter allows modules to define a list of boot steps using Module attributes. Each step define what to call, what it requires and enables. A directed acyclic graph is then created from theses steps, and called in the correct order.
Inspired/adapted to Elixir by RabbitMQ's boot process implemented in rabbit.erl and rabbit_misc.erl. For an in-depth explaination, read Alvaro Videla's article and slides.
Read the API documentation for full usage.
Using Booter
and the boot_step/3
macro:
defmodule MyModule do
use Booter
# without name (__MODULE__ is assumed)
boot_step mfa: {mod, fun, args}, requires: :required_step, enables: :another_step
# with name
boot_step :awesome_name, mfa: {mod, fun, args}, requires: :required_step, enables: :another_step
# With name and description
boot_step :awesome_name, "Unicorn generator", mfa: {mod,fun,args}, requires: :rainbow_server, enables: :magic
end
Just call Booter.boot!
. Can raise exceptions.