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lib/cachex/macros/stats.ex
defmodule Cachex.Macros.Stats do
@moduledoc false
# Defines a couple of macros needed in the Stats hook. Currently the only macro
# needed is the shorthand for swallowing a stat change. This simply matches
# against the provided arguments and then returns the state as-is.
# alias the main module
alias Cachex.Macros
@doc """
Defines a function body which just returns the passed in state. This is used
when a certain stats message shouldn't have an effect on the stats container.
"""
defmacro defswallow(head) do
{ _func_name, args } =
head
|> Macros.name_and_args
quote do
def handle_notify(unquote_splicing(args), var!(stats)) do
{ :ok, var!(stats) }
end
end
end
# Allow use of this module
defmacro __using__(_opts) do
quote do
import unquote(__MODULE__)
end
end
end