Elixir GenServer handle_cast 未被调用

Question

我对 Handle Cast 有疑问。模块加载后，它调用 periodic_comm，每 5 秒调用一次 save_data 方法。在我的 save_data 方法中，正在打印日志，但语句什么也不做。

GenServer.cast(__MODULE__, {:save_load_data, data})

这里定义了handle cast方法

 def handle_cast({:save_load_data, data}, state) do
  Logger.error("uin saving data====================================")
  # state = Map.put_new(state, :load_data, data)
  # Logger.debug "updated state : #{inspect state}"
  {:noreply, state}
end

整个文件看起来像这样

      defmodule Core.Inverter.Manager do
    # core inverter process that handles the inverter communication
    use GenServer
    require Logger

    def start_link(_) do
      Logger.info("putting some string")
      GenServer.start_link(__MODULE__, %{}, name: __MODULE__)
    end

    @impl true
    def init(_) do
      Logger.info("inverter Manager init'ed")
      {:ok, %{configs: nil, inverter_connection: nil, inverter_impl: nil}}
    end

    # public api
    # initialize the inverter and start periodic comm
    def init_inverter(configs) do
      GenServer.cast(__MODULE__, {:init_inverter, configs})
      GenServer.cast(__MODULE__, {:start_periodic_comm, configs})
    end

    def inverter_off() do
      GenServer.call(__MODULE__, :inverter_off)
    end

    @impl true
    def handle_cast({:init_inverter, configs}, state) do
      Logger.debug("initializing the inverter")
      # fetching inverter type/configurations
      inverter_impl = get_inverter_impl(configs)
      # initializing inverter comm channel
      inverter_connection = inverter_impl.init(configs)

      state = %{
        configs: configs,
        inverter_connection: inverter_connection,
        inverter_impl: inverter_impl
      }

      Logger.warn("inverter type #{state.inverter_impl}")
      {:noreply, state}
    end

    def handle_cast({:start_periodic_comm, configs}, state) do
      Logger.warn(
        "Actually Starting inverter periodic COMM with inverter type #{state.inverter_impl}"
      )

      start_periodic_comm(state)
      {:noreply, state}
    end

    @impl true
    def handle_call(
          :inverter_off,
          _from,
          %{inverter_impl: inverter_impl, inverter_connection: inverter_connection} = state
        ) do
      {:ok, inverter_connection} = inverter_impl.inverter_off(inverter_connection)
      {:reply, :ok, %{state | inverter_connection: inverter_connection}}
    end

    def handle_cast({:save_load_data, data}, state) do
      Logger.error("uin saving data====================================")
      # state = Map.put_new(state, :load_data, data)
      # Logger.debug "updated state : #{inspect state}"
      {:noreply, state}
    end

    defp start_periodic_comm(state) do
      periodic_comm(state)
    end

    defp periodic_comm(state) do
      # call functions from the inverter_type module, e.g infit.ex
      receive do
      after
        5000 ->
          {:ok, data} = state.inverter_impl.get_load_data(state)
          save_data(data)
      end

      periodic_comm(state)
    end

    # defp save_data() do end
    def save_data(data) do
      Logger.debug("saving data")
      Logger.debug("in savinf data data is : #{inspect(data)}")
      GenServer.cast(__MODULE__, {:save_load_data, data})
    end

    defp get_inverter_impl(configs) do
      # add case statements here
      Core.Inverter.Infini
    end
  end

Answer 1

我不太熟悉 elixir 的语法，但在我看来 periodic_comm 正在循环：

    defp periodic_comm(state) do
      # call functions from the inverter_type module, e.g infit.ex
      receive do
      after
        5000 ->
          {:ok, data} = state.inverter_impl.get_load_data(state)
          save_data(data)
      end

      periodic_comm(state)
    end

无论 save_data 的结果如何，线程都在无限循环调用 periodic_comm，因此它没有机会接收和执行 save_load_data 消息。

为了修复它，您应该重构服务器，使 handle_X 中的逻辑不循环，receive 各种消息。您可以使用 erlang:start_timer（我不知道长生不老药的对应物）或依靠 gen_server return 值中的 Timeout 来接收超时消息。

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