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 | |
24 | namespace 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. |
29 | class 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 | |