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Money functions for operations on and localization of a money data type with support for ISO 4217 currencies and ISO 24165 digial tokens (crypto currencies).
Current section
Files
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Files
lib/money/exchange_rates/exchange_rates_cache.ex
defmodule Money.ExchangeRates.Cache do
@moduledoc """
Defines a cache behaviour and default inplementation
of a cache for exchange rates
"""
@doc """
Initialize the cache when the exchange rates
retriever is started
"""
@callback init() :: any()
@doc """
Terminate the cache when the retriver process
stops normally
"""
@callback terminate() :: any()
@doc """
Retrieve the latest exchange rates from the
cache.
"""
@callback latest_rates() :: {:ok, map()} | {:error, {Exception.t(), String.t()}}
@doc """
Returns the exchange rates for a given
date.
"""
@callback historic_rates(Date.t()) :: {:ok, map()} | {:error, {Exception.t(), String.t()}}
@doc """
Store the latest exchange rates in the cache.
"""
@callback store_latest_rates(map(), DateTime.t()) :: :ok
@doc """
Store the historic exchange rates for a given
date in the cache.
"""
@callback store_historic_rates(map(), Date.t()) :: :ok
def latest_rates do
cache().latest_rates
end
def historic_rates(date) do
cache().historic_rates(date)
end
def cache do
Money.ExchangeRates.Retriever.config().cache_module
end
end