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The library for managing pools of workers.

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poolex lib poolex workers impl erlang_queue.ex
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lib/poolex/workers/impl/erlang_queue.ex 

defmodule Poolex.Workers.Impl.ErlangQueue do

  @moduledoc """

  Simple workers queue (FIFO) implementation based on Erlang `:queue`

  """

  @behaviour Poolex.Workers.Behaviour



  @impl true

  def init do

    :queue.new()

  end



  @impl true

  def init(workers) do

    :queue.from_list(workers)

  end



  @impl true

  def add(state, worker) do

    :queue.in(worker, state)

  end



  @impl true

  def member?(state, worker) do

    :queue.member(worker, state)

  end



  @impl true

  def remove(state, worker) do

    :queue.filter(fn element -> element != worker end, state)

  end



  @impl true

  def count(state) do

    :queue.len(state)

  end



  @impl true

  def to_list(state) do

    :queue.to_list(state)

  end



  @impl true

  def empty?(state) do

    :queue.is_empty(state)

  end



  @impl true

  def pop(state) do

    case :queue.out(state) do

      {{:value, worker}, new_state} -> {worker, new_state}

      {:empty, _state} -> :empty

    end

  end

end