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event_bus

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Traceable, extendable and minimalist event bus implementation for Elixir with built-in event store and event watcher based on ETS

Retired package: Deprecated - Please prefer event_bus library >= 1.6.0 version for bug fixes
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event_bus lib event_bus utils monotonic_time.ex
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lib/event_bus/utils/monotonic_time.ex 

defmodule EventBus.Util.MonotonicTime do

  @moduledoc false



  @eb_app :event_bus

  @eb_time_unit Application.get_env(@eb_app, :time_unit, :microsecond)



  @doc """

  Calculates monotonically increasing current time

  """

  @spec now() :: integer()

  def now do

    init_time() + monotonic_time()

  end



  defp init_time do

    case Application.get_env(@eb_app, :init_time) do

      nil ->

        time = os_time() - monotonic_time()

        save_init_time(time)



      time ->

        time

    end

  end



  defp save_init_time(time) do

    Application.put_env(:event_bus, :init_time, time, persistent: true)

    time

  end



  defp os_time do

    System.os_time(@eb_time_unit)

  end



  defp monotonic_time do

    System.monotonic_time(@eb_time_unit)

  end

end