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sched_ex

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SchedEx is a simple yet deceptively powerful scheduling library for Elixir.

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sched_ex lib sched_ex stats value.ex
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lib/sched_ex/stats/value.ex 

defmodule SchedEx.Stats.Value do

  @moduledoc false



  defstruct min: nil, max: nil, avg: nil, count: 0, histogram: [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]



  @num_periods 50

  @weight_factor 2 / (@num_periods + 1)

  @bucket_size 100



  def update(%__MODULE__{min: min, max: max, avg: avg, count: count, histogram: histogram}, sample) do

    index = trunc(sample / @bucket_size)

    |> max(0)

    |> min(length(histogram) - 1)

    %__MODULE__{

      min: min(min, sample),

      max: max && max(max, sample) || sample,

      avg: avg && (((sample - avg) * @weight_factor) + avg) || sample,

      count: count + 1,

      histogram: List.update_at(histogram, index, &(&1 + 1))

    }

  end

end