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Membrane Multimedia Framework (Core)

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membrane_core lib membrane core helper genserver.ex
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lib/membrane/core/helper/genserver.ex 

defmodule Membrane.Core.Helper.GenServer do

  @moduledoc false



  require Membrane.Logger



  @type genserver_return_t :: {:noreply, any()} | {:reply, any(), any()}



  @spec noreply({:ok, state}) :: {:noreply, state} when state: any()

  def noreply({:ok, new_state}), do: {:noreply, new_state}



  @spec noreply(

          {:ok, state}

          | {:error, state}

          | {{:error, reason}, state}

          | {:stop, reason, new_state :: state},

          old_state :: state

        ) ::

          {:noreply, state} | {:stop, reason, state}

        when state: any(), reason: any()

  def noreply({:ok, new_state}, _old_state), do: {:noreply, new_state}



  def noreply({{:error, reason}, new_state}, old_state) do

    Membrane.Logger.error("""

    Terminating GenServer, reason: #{inspect(reason)},

    old state: #{inspect(old_state, pretty: true)},

    new state: #{inspect(new_state, pretty: true)}

    """)



    {:stop, {:error, reason}, new_state}

  end



  def noreply({:error, reason}, old_state) do

    Membrane.Logger.error("""

    Terminating GenServer, reason: #{inspect(reason)},

    old state: #{inspect(old_state, pretty: true)}

    """)



    {:stop, {:error, reason}, old_state}

  end



  def noreply({:stop, _reason, _new_state} = stop, _old_state), do: stop



  @spec reply({:ok | {:ok, msg}, state}) :: {:reply, :ok | {:ok, msg}, state}

        when msg: any(), state: any()

  def reply({:ok, new_state}), do: {:reply, :ok, new_state}

  def reply({{:ok, v}, new_state}), do: {:reply, {:ok, v}, new_state}



  @spec reply(

          {:ok, new_state}

          | {{:ok, msg}, new_state}

          | {:error, new_state}

          | {{:error, reason}, new_state},

          old_state

        ) ::

          {:reply, :ok | {:error, reason} | {:ok, msg}, new_state}

        when msg: any(), reason: any(), new_state: any(), old_state: any()

  def reply({:ok, new_state}, _old_state), do: {:reply, :ok, new_state}

  def reply({{:ok, v}, new_state}, _old_state), do: {:reply, {:ok, v}, new_state}



  def reply({{:error, reason}, new_state}, old_state) do

    Membrane.Logger.error("""

    GenServer returning error reply, reason: #{inspect(reason)}

    old state: #{inspect(old_state, pretty: true)},

    new state: #{inspect(new_state, pretty: true)}

    """)



    {:reply, {:error, reason}, new_state}

  end



  def reply({:error, reason}, old_state) do

    Membrane.Logger.error("""

    GenServer returning error reply, reason: #{inspect(reason)}

    old state: #{inspect(old_state, pretty: true)}

    """)



    {:reply, {:error, reason}, old_state}

  end

end