如何安排代码在Elixir或Phoenix框架中每隔几个小时运行一次? [英] How can I schedule code to run every few hours in Elixir or Phoenix framework?

问题描述

因此，假设我想每隔4个小时发送一堆电子邮件或重新创建站点地图或其他内容，我将如何在Phoenix或仅使用Elixir做到这一点?

So let's say I want to send a bunch of emails or recreate sitemap or whatever every 4 hours, how would I do that in Phoenix or just with Elixir?

推荐答案

有一个简单的替代方法，不需要任何外部依赖项:

There is a simple alternative that does not require any external dependencies:

defmodule MyApp.Periodically do
  use GenServer

  def start_link do
    GenServer.start_link(__MODULE__, %{})
  end

  def init(state) do
    schedule_work() # Schedule work to be performed at some point
    {:ok, state}
  end

  def handle_info(:work, state) do
    # Do the work you desire here
    schedule_work() # Reschedule once more
    {:noreply, state}
  end

  defp schedule_work() do
    Process.send_after(self(), :work, 2 * 60 * 60 * 1000) # In 2 hours
  end
end

现在在您的监督树中:

worker(MyApp.Periodically, [])

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