Question

我从GenServer中的句柄信息功能调用elixir genserver来添加电话号码获取表单客户端。但是一旦调用handle_call，所有者进程就会崩溃[timeout]。请帮忙。

全局创建一个ETS，以便在调用任何下面描述的函数之前插入值。

def handle_info(message, state) do

    {a,b} = message
    phonenumber = b[:body] 
    add phonenumber
    {:noreply, state}
end

def add(phonenumber) do
    GenServer.call(__MODULE__, {:add, phonenumber})
end


def handle_call({:add, phonenumber}, from, state) do

    :ets.insert(:access_table, {:details, phonenumber})
    reply = {:ok, "Added #{phonenumber} to profile"}
    new_state = [{username} | state]
    {:reply, reply , new_state}
end

错误：

** When Server state == []
** Reason for termination == 
** {timeout,{gen_server,call,['Elixir.Bankrecord',{add,"346534543534"},5000]}}
** (EXIT from #PID<0.150.0>) exited in: :gen_server.call(Bankrecord, {:add, '346534543534'}, 5000)
** (EXIT) time out

Answer 1

您无法在通话中给自己打电话，就像在handle_info中调用add来执行对gen_server的回调一样。由于所有操作都在gen_server中按顺序发生，因此您最终会阻止自己。解决方案应该是在模块上使用简单的私有add函数，并让handle_info和handle_call({:add委托给它。

def add(phonenumber) do
  GenServer.call(__MODULE__, {:add, phonenumber})
end

def handle_info({_, message}, state) do
  add_number message[:body]
  {:noreply, state}
end


def handle_call({:add, phonenumber}, from, state) do
  add_number phonenumber
  {:reply, {:ok, "Added #{phonenumber} to profile"} , [{username} | state]}
end

defp add_number(phonenumber) do
  :ets.insert(:access_table, {:details, phonenumber})
end

＆＃39; handle_call＆＃39;越来越快

1 个答案: