Code based on "Intro to OTP In Elixir" (https://www.youtube.com/watch?v=CJT8wPnmjTM)

A small application wrapper for https://www.fantasyfootballnerd.com/. Uses the the ffnerd-api-elixir elixir API(https://github.com/jessejanderson/ffnerd-api-elixir). This application uses OTP for its process management.

Clone the repo locally

git clone https://github.com/mazz/fb_manager_otp.git

Get dependencies and compile dependencies

mix deps.get && mix deps.compile

Add compiled app to iex runtime

iex -S mix

IEX> Start the supervisor

FbManagerOtp.Supervisor.start_link

IEX> Demonstrate that server is already running because of supervisor

FbManagerOtp.Server.start_link # gets created when Supervisor does

IEX> Add some team members

FbManagerOtp.Server.add("Russell Wilson")
FbManagerOtp.Server.add("Doug Baldwin")

IEX> Display fantasy team

FbManagerOtp.Server.team

IEX> Remove a team member

FbManagerOtp.Server.remove("Doug Baldwin")

IEX> Display fantasy team again

FbManagerOtp.Server.team

IEX> Find elixir process by Atom

Process.whereis(:fb_manager)

IEX> Kill server

Process.whereis(:fb_manager) |> Process.exit(:kill)

IEX> Demonstrate that server is re-created by supervisor

Process.whereis(:fb_manager)

Application initialization In mix.exs, add application initialization

| mod: {FbManagerOtp.Application, []}

Run IEX again

iex -S mix

IEX> Demonstrate that we didn't need to call start_link because application already did

FbManagerOtp.Server.add("Russell Wilson") # did not need to call start_link

IEX> Inspect the Erlang Runtime

:observer.start

IEX> Add a player again

FbManagerOtp.Server.add("Doug Baldwin")

IEX> Inspect the team

FbManagerOtp.Server.team

IEX> Kill the server

Process.whereis(:fb_manager) |> Process.exit(:kill)

IEX> See, the server got restarted, no state

FbManagerOtp.Server.team

mix run --no-halt # run forever

If available in Hex, the package can be installed by adding fb_manager_otp to your list of dependencies in mix.exs:

def deps do
  [
    {:fb_manager_otp, "~> 0.1.0"}
  ]
end

Documentation can be generated with ExDoc and published on HexDocs. Once published, the docs can be found at https://hexdocs.pm/fb_manager_otp.