Created
December 14, 2016 10:09
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Sample GenServer that provides sync call over async function
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defmodule SyncCallonAsync do | |
use GenServer | |
def start_link do | |
GenServer.start_link(__MODULE__, [], name: __MODULE__) | |
end | |
def init(_) do | |
{:ok, %{pending: []}} | |
end | |
def sync do | |
GenServer.call(__MODULE__, :sync) | |
end | |
def handle_call(:sync, {pid, _} = from, %{pending: pend} = state) do | |
mref = Process.monitor(pid) | |
dispatch_req(from) | |
{:noreply, %{state | pending: [{from, mref}| pend]}} | |
end | |
def dispatch_req(from) do | |
current = self() | |
spawn(fn -> | |
Process.sleep(1000) | |
send current, {:delayed_reply, from, :done} | |
end) | |
end | |
def handle_info(:timeout, state) do | |
{:noreply, state} | |
end | |
def handle_info({:delayed_reply, from, reply}, %{pending: pend} = state) do | |
case List.keytake(pend, from, 0) do | |
{{_from, mref}, rest} -> | |
Process.demonitor(mref) | |
GenServer.reply(from, reply) | |
{:noreply, %{state | pending: rest}} | |
false -> | |
{:noreply, state} | |
end | |
end | |
end | |
defmodule Run do | |
def measure(function) do | |
function | |
|> :timer.tc | |
|> elem(0) | |
|> Kernel./(1_000_000) | |
end | |
def run_for(times \\ 10) do | |
SyncCallonAsync.start_link | |
1..times |> Enum.each(fn (_) -> Task.async(fn -> measure(&SyncCallonAsync.sync/0) |> IO.inspect end) end) | |
end | |
end |
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