139 lines
4.1 KiB
C++
139 lines
4.1 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <folly/experimental/TimerFD.h>
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#include <folly/io/async/DelayedDestruction.h>
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#include <map>
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namespace folly {
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// generic TimerFD based timeout manager
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class TimerFDTimeoutManager : public TimerFD {
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public:
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using UniquePtr =
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std::unique_ptr<TimerFDTimeoutManager, DelayedDestruction::Destructor>;
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using SharedPtr = std::shared_ptr<TimerFDTimeoutManager>;
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public:
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class Callback
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: public boost::intrusive::list_base_hook<
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boost::intrusive::link_mode<boost::intrusive::auto_unlink>> {
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public:
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Callback() = default;
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explicit Callback(TimerFDTimeoutManager* mgr) : mgr_(mgr) {}
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virtual ~Callback() = default;
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virtual void timeoutExpired() noexcept = 0;
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virtual void callbackCanceled() noexcept {
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timeoutExpired();
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}
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const std::chrono::microseconds& getExpirationTime() const {
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return expirationTime_;
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}
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void setExpirationTime(
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TimerFDTimeoutManager* mgr,
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const std::chrono::microseconds& expirationTime) {
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mgr_ = mgr;
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expirationTime_ = expirationTime;
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}
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std::chrono::microseconds getTimeRemaining() const {
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return getTimeRemaining(std::chrono::steady_clock::now());
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}
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std::chrono::microseconds getTimeRemaining(
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std::chrono::steady_clock::time_point now) const {
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auto nowMs = std::chrono::duration_cast<std::chrono::microseconds>(
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now.time_since_epoch());
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if (expirationTime_ > nowMs) {
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return std::chrono::duration_cast<std::chrono::microseconds>(
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expirationTime_ - nowMs);
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}
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return std::chrono::microseconds(0);
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}
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void scheduleTimeout(std::chrono::microseconds timeout) {
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if (mgr_) {
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mgr_->scheduleTimeout(this, timeout);
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}
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}
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bool cancelTimeout() {
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return mgr_->cancelTimeout(this);
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}
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private:
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TimerFDTimeoutManager* mgr_{nullptr};
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std::chrono::microseconds expirationTime_{0};
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};
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explicit TimerFDTimeoutManager(folly::EventBase* eventBase);
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~TimerFDTimeoutManager() override;
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// from TimerFD
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void onTimeout() noexcept final;
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size_t cancelAll();
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void scheduleTimeout(Callback* callback, std::chrono::microseconds timeout);
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bool cancelTimeout(Callback* callback);
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template <class F>
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void scheduleTimeoutFn(F fn, std::chrono::microseconds timeout) {
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struct Wrapper : Callback {
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explicit Wrapper(F f) : fn_(std::move(f)) {}
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void timeoutExpired() noexcept override {
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try {
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fn_();
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} catch (std::exception const& e) {
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LOG(ERROR) << "HHWheelTimerBase timeout callback threw an exception: "
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<< e.what();
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} catch (...) {
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LOG(ERROR)
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<< "HHWheelTimerBase timeout callback threw a non-exception.";
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}
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delete this;
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}
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F fn_;
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};
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Wrapper* w = new Wrapper(std::move(fn));
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scheduleTimeout(w, timeout);
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}
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size_t count() const;
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private:
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void processExpiredTimers();
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void scheduleNextTimer();
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std::chrono::steady_clock::time_point getCurTime() {
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return std::chrono::steady_clock::now();
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}
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// we can attempt to schedule new entries while in processExpiredTimers
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// we want to reschedule the timers once we're done with the processing
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bool processingExpired_{false};
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typedef boost::intrusive::
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list<Callback, boost::intrusive::constant_time_size<false>>
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CallbackList;
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std::map<std::chrono::microseconds, CallbackList> callbacks_;
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CallbackList inProgressList_;
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};
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} // namespace folly
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