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scout_apm

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ScoutAPM agent for Phoenix & Elixir projects. For more information, visit https://www.scoutapm.com/agents/elixir-phoenix-monitoring.

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scout_apm lib scout_apm persistent_histogram.ex
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lib/scout_apm/persistent_histogram.ex 

defmodule ScoutApm.PersistentHistogram do

  @name __MODULE__



  def start_link() do

    Agent.start_link(fn -> %{} end, name: @name)

  end



  # This is synchronous.

  def record_timing(key, timing) do

    Agent.update(@name,

      fn state ->

        Map.update(

          state,

          key,

          ApproximateHistogram.new(),

          fn histo -> ApproximateHistogram.add(histo, timing) end

        )

      end

    )

  end



  def keys do

    Agent.get(@name, fn state -> Map.keys(state) end)

  end



  # Returns {:ok, percentile} or :error

  def percentile(key, timing) do

    Agent.get(@name,

      fn state ->

        case Map.fetch(state, key) do



          {:ok, histo} ->

            p = ApproximateHistogram.percentile(histo, timing)

            {:ok, p}



          _ ->

            :error

        end

      end

    )

  end



  # Returns {:ok, percentile} or :error

  def percentile_for_value(key, value) do

    Agent.get(@name,

      fn state ->

        case Map.fetch(state, key) do

          {:ok, histo} ->

            {:ok, ApproximateHistogram.percentile_for_value(histo, value)}



          _ ->

            :error

        end

      end

    )

  end

end