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new_relic_agent

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New Relic's Open-Source Elixir Agent

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new_relic_agent lib new_relic sampler agent.ex
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lib/new_relic/sampler/agent.ex 

defmodule NewRelic.Sampler.Agent do

  use GenServer



  alias NewRelic.Transaction



  # Takes samples of the state of the Agent



  @moduledoc false



  def start_link(_) do

    GenServer.start_link(__MODULE__, :ok, name: __MODULE__)

  end



  def init(:ok) do

    if NewRelic.Config.enabled?(),

      do: Process.send_after(self(), :report, NewRelic.Sampler.Reporter.random_sample_offset())



    {:ok, %{}}

  end



  def handle_info(:report, state) do

    record_sample()

    Process.send_after(self(), :report, NewRelic.Sampler.Reporter.sample_cycle())

    {:noreply, state}

  end



  def handle_call(:report, _from, state) do

    record_sample()

    {:reply, :ok, state}

  end



  def record_sample do

    NewRelic.report_metric(

      {:supportability, :agent, "ReporterCollectingSize"},

      value: ets_size(NewRelic.Transaction.Reporter.Collecting)

    )



    NewRelic.report_metric(

      {:supportability, :agent, "ReporterTrackingSize"},

      value: ets_size(NewRelic.Transaction.Reporter.Tracking)

    )



    NewRelic.report_metric(

      {:supportability, :agent, "ReporterCompleteTasksActive"},

      value: length(Task.Supervisor.children(Transaction.TaskSupervisor))

    )

  end



  def ets_size(table) do

    :ets.info(table, :size)

  rescue

    ArgumentError -> nil

  end

end