__type__() :: :cache | :source | :bridge

fingerprint(cache :: module(), opts :: Keyword.t()) :: term()

init(cache :: module(), fingerprint :: fingerprint(), opts :: Keyword.t()) ::
  :ok | {:error, atom()}

list(state :: term(), allow_cached? :: boolean()) :: [term()]

primary(fingerprint :: fingerprint()) :: atom() | nil

release(cache :: module(), fingerprint :: fingerprint()) ::
  :ok | {:error, atom()}