如何使GenServer进程可用于我的整个应用程序?

我使用GenServer作为排队系统。如何让整个应用程序都可以访问相同的过程?

application.ex

children = [
  supervisor(Prefect, [], name: PrefectQueue)
]

Prefect 模块是发电机服务器:

defmodule Prefect do
  use GenServer
  alias Prefect.Document

  # client
  def start_link() do
    GenServer.start_link(__MODULE__, [])
  end

  def add(pid, item) do
    GenServer.cast(pid, item)
  end

  # server
  def handle_cast(item, list) do
    updated_list = [item | list]
    {:noreply, updated_list}
  end
end

不过,我似乎无法在控制器中访问它:

defmodule PrefectWeb.DocumentController do
  use PrefectWeb, :controller

  def create(conn, params) do
    Prefect.add(PrefectQueue, params["id"])
    conn
    |> send_resp(200, "Queued #{Prefect.view(PrefectQueue)}")
  end
end

[info] POST /api/documents
[debug] Processing with PrefectWeb.DocumentController.create/2
  Parameters: %{"id" => "1"}
  Pipelines: [:api]
[error] #PID<0.349.0> running PrefectWeb.Endpoint terminated
Server: 0.0.0.0:4000 (http)
Request: POST /api/documents
** (exit) exited in: GenServer.call(Prefect.Queue, :view, 5000)
    ** (EXIT) no process: the process is not alive or there's no process currently associated with the given name, possibly because its application isn't started