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lib/cachex/fallback.ex
defmodule Cachex.Fallback do
@moduledoc false
# This module just contains the struct definitions of a `Cachex.Fallback` model,
# in order to provide an easy way to move fallback options around without relying
# on Tuples or Keyword Lists.
# internal structure
defstruct [
state: nil, # the state to provide to a fallback
action: nil # the action a fallback should take
]
# our opaque type
@opaque t :: %__MODULE__{ }
@doc """
Parses an input into a Fallback struct.
We expect a list of options and use them to derive the Fallback. If anything
other than options are provided, we just return a default structure.
"""
def parse(options) when is_list(options),
do: %__MODULE__{
state: Keyword.get(options, :state),
action: Cachex.Util.get_opt(options, :action, &is_function/1)
}
def parse(_options),
do: %__MODULE__{ }
end