BEAM Architecture Handbook

Transcript

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21. receive do
    :some_message ->
    # ...
    :other_message ->
    # ...
    end
    

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22. def handle_info(:some_message, state) do
    # ...
    end
    def handle_info(:other_message, state) do
    # ...
    end
    def handle_info(unknown, state) do
    Logger.warn("Unknown message")
    {:noreply, state}
    end
    

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62. defmodule MyAppWeb.Controller do
    use MyAppWeb, :controller
    def show(conn, %{"id" => id}) do
    id = String.to_integer(id)
    end
    end
    

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63. defmodule MyAppWeb.Controller do
    use MyAppWeb, :controller
    def show(conn, %{"id" => id}) do
    case Integer.parse(id) do
    {id, ""} ->
    # ...
    _other ->
    send_resp(conn, 400, "bad id")
    end
    end
    end
    

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73. Node.monitor(consumer_node, true)
    monitor_ref = Process.monitor(consumer_pid)
    send(consumer_pid, {monitor_ref, message})
    receive do
    {:ack, ^monitor_ref} ->
    Process.demonitor(monitor_ref, [:flush])
    {:DOWN, ^monitor_ref, _, _, _} ->
    give_to_another_consumer(message)
    {:nodedown, ^consumer_node} ->
    give_to_another_consumer(message)
    end
    

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