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grains

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A framework to implement process data flows using declarative flow graphs.

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grains lib grains support constant.ex
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lib/grains/support/constant.ex 

defmodule Grains.Support.Constant do

  @moduledoc """

  A grain which holds a constant value.

  """



  use Grains.GenGrain



  defmodule State do

    @enforce_keys [:constant]



    defstruct @enforce_keys

  end



  @impl true

  def init(args) do

    {:ok, struct!(State, args)}

  end



  @impl true

  def handle_push(_msg, _from, state) do

    push(state.constant)

    {:noreply, state}

  end



  @impl true

  def handle_pull(_from, state) do

    {:reply, state.constant, state}

  end



  @impl true

  def handle_pull(_from, _tag, state) do

    {:reply, state.constant, state}

  end

end