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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.NullCache do
   6   @moduledoc """
   7   A module simulating a permanently empty cache.
   8   """
   9   @behaviour Pleroma.Caching
  10
  11   @impl true
  12   def get!(_, _), do: nil
  13
  14   @impl true
  15   def put(_, _, _, _ \\ nil), do: {:ok, true}
  16
  17   @impl true
  18   def stream!(_, _), do: []
  19
  20   @impl true
  21   def get(_, _), do: {:ok, nil}
  22
  23   @impl true
  24   def fetch!(_, key, func) do
  25     case func.(key) do
  26       {_, res} -> res
  27       res -> res
  28     end
  29   end
  30
  31   @impl true
  32   def get_and_update(_, _, func) do
  33     func.(nil)
  34   end
  35
  36   @impl true
  37   def expire_at(_, _, _), do: {:ok, true}
  38
  39   @impl true
  40   def exists?(_, _), do: {:ok, false}
  41
  42   @impl true
  43   def execute!(_, func) do
  44     func.(:nothing)
  45   end
  46
  47   @impl true
  48   def del(_, _), do: {:ok, true}
  49 end