Created
June 20, 2019 14:13
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Separate state
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defmodule Reducer do | |
use GenServer | |
def start_link(state_pid, options \\ []) do | |
GenServer.start_link(__MODULE__, state_pid, options) | |
end | |
def init(state_pid) do | |
{:ok, %{state_pid: state_pid}} | |
end | |
def run(callback) do | |
GenServer.cast(__MODULE__, {:run, callback}) | |
end | |
def get_state do | |
GenServer.call(__MODULE__, :get_state) | |
end | |
def handle_cast({:run, callback}, state = %{state_pid: state_pid}) do | |
Agent.update(state_pid, callback) | |
{:noreply, state} | |
end | |
def handle_call(:get_state, _from, state = %{state_pid: state_pid}) do | |
{:reply, Agent.get(state_pid, &(&1)), state} | |
end | |
end | |
{:ok, state} = Agent.start_link(fn -> 0 end) | |
Reducer.start_link(state, name: Reducer) | |
Reducer.run(fn (num) -> num + 1 end) | |
Reducer.get_state |
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