Patch Call Graph

call_graph.ex

assert {:bad, :error} == Discord.send_message(%Message{})

# We start at the Facade
Discord.send_message(%Message{}) {
  # The Facade calls the Delegate
  Delegate.send_message(message) {
    # The Delegate checks if the Server has a patch for send_message/1
    Server.delegate(Discord, :send_message, [message]) {
      # The Server doesn't, so it calls the Original
      Original.send_message(message) {
        # The Original calls the Delegate's validate_message/1 function
      	Delegate.validate_message(message) {
          # The Delegate checks if the Server has a patch for validate_message/1
          Server.delegate(Discord, :validate_message, [message]) {
            # The Server does have a patch for validate_message/1 so it returns it
          } -> {:bad, :error}
        # The Delegate returns the patched value to the Original
        } -> {:bad, :error}
      # The Original's with statement fails to match, so it returns the value
      } -> {:bad, :error}
    # The Server returns the Original's result
    } -> {:bad, :error}
  # The Delegate returns the Server's result
  } -> {:bad, :error}
# The Facade returns the Delete's result
} -> {:bad, :error}