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New Relic's Open-Source Elixir Agent

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new_relic_agent lib new_relic harvest harvester_store.ex
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lib/new_relic/harvest/harvester_store.ex 

defmodule NewRelic.Harvest.HarvesterStore do

  use GenServer



  # Wrapper around an ETS table that tracks the current harvesters



  @moduledoc false



  def start_link(_) do

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

  end



  def init(:ok) do

    NewRelic.sample_process()

    :ets.new(__MODULE__, [:named_table, :set, :public, read_concurrency: true])

    {:ok, %{}}

  end



  def current(harvester) do

    case :ets.lookup(__MODULE__, harvester) do

      [{^harvester, pid}] -> pid

      _ -> nil

    end

  rescue

    _ -> nil

  end



  def update(harvester, pid) do

    :ets.insert(__MODULE__, {harvester, pid})

  end

end