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# ConcurrentLimiter: A concurrency limiter.
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: LGPL-3.0-only
defmodule ConcurrentLimiterTest do
use ExUnit.Case
doctest ConcurrentLimiter
test "limiter is atomic" do
name = "test"
ConcurrentLimiter.new(name, 2, 2)
self = self()
spawn_link(fn -> sleepy(self, name, 500) end)
spawn_link(fn -> sleepy(self, name, 500) end)
spawn_link(fn -> sleepy(self, name, 500) end)
spawn_link(fn -> sleepy(self, name, 500) end)
spawn_link(fn -> sleepy(self, name, 500) end)
assert_receive :ok, 2000
assert_receive :ok, 2000
assert_receive {:error, :overload}, 2000
assert_receive :ok, 2000
assert_receive :ok, 2000
end
defp sleepy(parent, name, duration) do
result =
ConcurrentLimiter.limit(name, fn ->
send(parent, :ok)
Process.sleep(duration)
:ok
end)
case result do
:ok -> :ok
other -> send(parent, other)
end
end
end
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