Pattern matching example

experiment_coordinator.ex

defmodule ExperimentCoordinator do
  use GenServer
  require Logger

  def handle_call({:configure, config}, _from, :not_started) do
    Logger.info "Configuring node with parameters: #{inspect config}..."
    {:reply, :ok, :ready}
  end

  def handle_call(:begin_pings, _from, :ready) do
    Logger.info "Pinging Peers...."
    {:reply, :ok, :pinging}
  end

  def handle_call(message, from, state) do
    Logger.error "Command #{inspect message} is not handled in #{inspect state} state"
    {:reply, :error, state}
  end

  def run do
    {:ok, pid} = GenServer.start_link(__MODULE__, :not_started)
    GenServer.call(pid, {:configure, [vivaldi_cc: 0.3]})
    GenServer.call(pid, :begin_pings)
    GenServer.call(pid, :ready)
  end
    
end