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exd lib exd source adapter store.ex
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lib/exd/source/adapter/store.ex 

defmodule Exd.Source.Store do

  @moduledoc """

  Use a store as source

  """

  use Exd.Source.Adapter



  defstruct store_pid: nil,

            adapter: nil,

            done: false



  @impl true

  def init(opts) do

    {adapter, adapter_opts} = Keyword.fetch!(opts, :adapter)

    {:ok, store_pid} = adapter.start_link(adapter_opts)



    {

      :ok,

      %__MODULE__{

        adapter: adapter,

        store_pid: store_pid

      }

    }

  end



  @impl true

  def handle_from(demand, %{done: true} = _state), do: :done

  def handle_from(demand, state) do

    {:ok, matches} = state.adapter.all(:my_store)

    {:ok, matches, %__MODULE__{state | done: true}}

  end



end