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cqrs_tools lib cqrs clock.ex
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lib/cqrs/clock.ex

defmodule Cqrs.Clock do
@callback utc_now(_message :: atom()) :: DateTime.t()
def utc_now(message), do: clock().utc_now(message)
defp clock do
Application.get_env(:cqrs_tools, :clock, Cqrs.Clock.SystemClock)
end
end