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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2020 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!(_, _, func) do
  25     {_, res} = func.()
  26     res
  27   end
  28
  29   @impl true
  30   def get_and_update(_, _, func) do
  31     func.(nil)
  32   end
  33
  34   @impl true
  35   def expire_at(_, _, _), do: {:ok, true}
  36
  37   @impl true
  38   def exists?(_, _), do: {:ok, false}
  39
  40   @impl true
  41   def execute!(_, func) do
  42     func.(:nothing)
  43   end
  44
  45   @impl true
  46   def del(_, _), do: {:ok, true}
  47 end