Elixir Supervisor 三种不同的strategy

Elixir Supervisor 三种不同的strategy.md

defmodule KVServer.Application do
  # See https://hexdocs.pm/elixir/Application.html
  # for more information on OTP Applications
  @moduledoc false

  use Application

  def start(_type, _args) do
    # List all child processes to be supervised
    # port = String.to_integer(System.get_env("PORT") || raise "missing $PORT environment variable")

    children = [
      # Starts a worker by calling: KVServer.Worker.start_link(arg)
      # {KVServer.Worker, arg},
      {Task.Supervisor, name: KVServer.TaskSupervisor},
      {Task, fn -> KVServer.accept(4040) end}
    ]

    # See https://hexdocs.pm/elixir/Supervisor.html
    # for other strategies and supported options
    opts = [strategy: :one_for_one, name: KVServer.Supervisor]
    Supervisor.start_link(children, opts)
  end
end

1. :one_for_one,通过上面的代码，我们可以看出该应用启动了两个进程，当其中一个crash时，只会重启自身的进程
2. :one_for_all,其中一个子进程crash时，重启所有子进程
3. :rest_for_all, 按顺序重启当前进程之后的所有进程