1/*
2 * Copyright 2014-present Facebook, Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#pragma once
18
19#include <folly/futures/Future.h>
20#include <folly/io/async/EventBase.h>
21#include <folly/io/async/HHWheelTimer.h>
22#include <thread>
23
24namespace folly {
25
26/// The default Timekeeper implementation which uses a HHWheelTimer on an
27/// EventBase in a dedicated thread. Users needn't deal with this directly, it
28/// is used by default by Future methods that work with timeouts.
29class ThreadWheelTimekeeper : public Timekeeper {
30 public:
31 /// But it doesn't *have* to be a singleton.
32 ThreadWheelTimekeeper();
33 ~ThreadWheelTimekeeper() override;
34
35 /// Implement the Timekeeper interface
36 /// This future *does* complete on the timer thread. You should almost
37 /// certainly follow it with a via() call or the accuracy of other timers
38 /// will suffer.
39 Future<Unit> after(Duration) override;
40
41 protected:
42 folly::EventBase eventBase_;
43 std::thread thread_;
44 HHWheelTimer::UniquePtr wheelTimer_;
45};
46
47} // namespace folly
48