1 | /* |
---|---|
2 | * Copyright 2018-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 <glog/logging.h> |
20 | #include <atomic> |
21 | |
22 | #include <folly/executors/ScheduledExecutor.h> |
23 | #include <folly/futures/Future.h> |
24 | |
25 | namespace folly { |
26 | |
27 | struct FOLLY_EXPORT TimekeeperScheduledExecutorNoTimekeeper |
28 | : public std::logic_error { |
29 | TimekeeperScheduledExecutorNoTimekeeper() |
30 | : std::logic_error("No Timekeeper available") {} |
31 | }; |
32 | |
33 | // This class turns a Executor into a ScheduledExecutor. |
34 | class TimekeeperScheduledExecutor : public ScheduledExecutor { |
35 | public: |
36 | TimekeeperScheduledExecutor(TimekeeperScheduledExecutor const&) = delete; |
37 | TimekeeperScheduledExecutor& operator=(TimekeeperScheduledExecutor const&) = |
38 | delete; |
39 | TimekeeperScheduledExecutor(TimekeeperScheduledExecutor&&) = delete; |
40 | TimekeeperScheduledExecutor& operator=(TimekeeperScheduledExecutor&&) = |
41 | delete; |
42 | |
43 | static Executor::KeepAlive<TimekeeperScheduledExecutor> create( |
44 | Executor::KeepAlive<> parent, |
45 | Function<std::shared_ptr<Timekeeper>()> getTimekeeper = |
46 | detail::getTimekeeperSingleton); |
47 | |
48 | virtual void add(Func func) override; |
49 | |
50 | virtual void scheduleAt(Func&& func, ScheduledExecutor::TimePoint const& t) |
51 | override; |
52 | |
53 | protected: |
54 | bool keepAliveAcquire() override; |
55 | void keepAliveRelease() override; |
56 | |
57 | private: |
58 | TimekeeperScheduledExecutor( |
59 | KeepAlive<Executor>&& parent, |
60 | Function<std::shared_ptr<Timekeeper>()> getTimekeeper) |
61 | : parent_(std::move(parent)), getTimekeeper_(std::move(getTimekeeper)) {} |
62 | |
63 | ~TimekeeperScheduledExecutor() { |
64 | DCHECK(!keepAliveCounter_); |
65 | } |
66 | |
67 | void run(Func); |
68 | |
69 | KeepAlive<Executor> parent_; |
70 | Function<std::shared_ptr<Timekeeper>()> getTimekeeper_; |
71 | std::atomic<ssize_t> keepAliveCounter_{1}; |
72 | }; |
73 | |
74 | } // namespace folly |
75 |