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Simple Memoization in Elixir (using FastGlobal)
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| defmodule Memoize do | |
| @moduledoc """ | |
| Simple memoization helper built on top of FastGlobal. | |
| Remember to add `{:fastglobal, "~> 1.0"}` to your | |
| dependencies first. | |
| ## Usage | |
| def my_method do | |
| Memoize.run :my_method, fn -> | |
| # return something | |
| end | |
| end | |
| ## Other | |
| Author: Sheharyar Naseer | |
| License: MIT | |
| Website: https://sheharyar.me | |
| Find updates to this module at https://git.io/fNcBb | |
| """ | |
| # Public API | |
| # ---------- | |
| @doc """ | |
| If previously saved value exists, return that else | |
| perform memoization for given key and function. | |
| """ | |
| def run(key, fun) when is_atom(key) do | |
| case get!(key) do | |
| nil -> | |
| value = fun.() | |
| put!(key, value) | |
| value | |
| result -> | |
| result | |
| end | |
| end | |
| @doc "Force get value" | |
| defdelegate get!(key), to: FastGlobal, as: :get | |
| @doc "Force put value" | |
| defdelegate put!(key, value), to: FastGlobal, as: :put | |
| end |
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