josevalim

defmodule Rotor do
  @doc """
  Starts a new rotor as part of a supervision tree.

  ## Options

  * `:name` - the registered name of the rotor

  """
  def start_link(paths, opts) do

josevalim

defmodule Todo.Manager do
  use GenServer

  ## Client API

  @doc """
  Starts the `Todo.Manager`.
  """
  def start_link(table, sup, event, opts \\ []) do
    {:ok, pid} = GenServer.start_link(__MODULE__, {table, sup, event}, opts)

josevalim

defmodule Todo.Supervisor do
  use Supervisor
 
  def start_link do
    ets = :ets.new(@manager,
                   [:set, :public, :named_table, {:read_concurrency, true}])
    Supervisor.start_link(__MODULE__, ets, name: Todo.Supervisor)
  end
 
  @manager Todo.Manager

josevalim

=ERROR REPORT==== 12-Jun-2014::15:23:03 ===
** Task <0.38.0> terminating
** Reason for termination ==
** {badarg,[{erlang,hd,[[]],[]},
            {'Elixir.Agent.Server',handle_call,3,
                                   [{file,"lib/agent/server.ex"},{line,11}]},
            {gen_server,handle_msg,5,[{file,"gen_server.erl"},{line,580}]},
            {proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,239}]}]}

josevalim

@proto_version "1.0"

def process_options(opts) do
  ret = []
  if opts[:in], do: ret = ["-in"|ret]

  case opts[:err] do
    :out -> ret = ["-err", "out"|ret]
    :err -> ret = ["-err", "err"|ret]
    _ -> nil

josevalim

iex(1)> defmodule Foo do
...(1)> use GenEvent
...(1)> end
{:module, Foo,
 <<70, 79, 82, 49, 0, 0, 8, 144, 66, 69, 65, 77, 69, 120, 68, 99, 0, 0, 2, 7, 131, 104, 2, 100, 0, 14, 101, 108, 105, 120, 105, 114, 95, 100, 111, 99, 115, 95, 118, 49, 108, 0, 0, 0, 2, 104, 2, 100, 0, 4, ...>>,
 [true, true, true, true, true, true]}
iex(2)> {:ok, pid} = GenEvent.start_link
{:ok, #PID<0.50.0>}
iex(3)> GenEvent.add_handler(pid, Foo, [])
:ok

josevalim

iex(2)> import Supervisor.Spec
nil
iex(3)> Supervisor.start_link([worker(Task, [fn -> Process.register(self, :hello); :timer.sleep(:infinity) end])], strategy: :one_for_one)
{:ok, #PID<0.61.0>}
iex(4)> Process.whereis(:hello)
#PID<0.62.0>
iex(5)> Process.exit(self(), :shutdown)
** (EXIT from #PID<0.57.0>) shutdown

Interactive Elixir (0.15.2-dev) - press Ctrl+C to exit (type h() ENTER for help)

josevalim

defmodule Parsec do
  # Handles parsec for ..., do: ...
  defmacro parsec({:for, _, args}) do
    {exprs, [[do: return]]} = Enum.split(args, -1)
    do_parsec(exprs, return)
  end

  # Handles parsec for ... do ... end
  defmacro parsec({:for, _, args}, do: return) do
    do_parsec(args, return)

josevalim

+ EPMD
  - Distributed systems are cool
  - Distributed systems are also complex
  - First step: How to find other machines (and nodes) in the same network
    - Erlang Port Mapper Daemon

+ EPMD in C
  - Ships with Erlang
  - is a TCP server
  - usually 4369

josevalim

defmodule Exq.RouterPlug do
  import Plug.Conn
  use Plug.Router

  plug :match
  plug :dispatch

  get "/queues" do
    IO.puts "YOLO"
    conn |> halt()