mirror of
https://github.com/kidfromjupiter/nearby.git
synced 2026-09-15 07:06:11 -04:00
137 lines
3.8 KiB
C++
137 lines
3.8 KiB
C++
// Copyright 2020 Google LLC
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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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// https://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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#include "internal/platform/implementation/g3/scheduled_executor.h"
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#include <atomic>
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#include <memory>
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#include <optional>
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#include <utility>
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#include "absl/strings/str_format.h"
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#include "absl/synchronization/mutex.h"
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#include "absl/time/time.h"
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#include "internal/platform/implementation/cancelable.h"
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#include "internal/platform/medium_environment.h"
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#include "internal/platform/runnable.h"
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#include "internal/test/fake_clock.h"
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namespace nearby {
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namespace g3 {
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namespace {
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class ScheduledCancelable : public api::Cancelable {
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public:
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bool Cancel() override {
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Status expected = kNotRun;
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if (status_.compare_exchange_strong(expected, kCanceled)) {
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return true;
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}
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return false;
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}
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bool IsCanceled() const { return status_ == kCanceled; }
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bool MarkExecuted() {
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Status expected = kNotRun;
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while (expected == kNotRun) {
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if (status_.compare_exchange_strong(expected, kExecuted)) {
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return true;
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}
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}
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return false;
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}
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private:
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enum Status {
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kNotRun,
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kExecuted,
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kCanceled,
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};
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std::atomic<Status> status_ = kNotRun;
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};
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} // namespace
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ScheduledExecutor::ScheduledExecutor() {
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std::optional<FakeClock*> fake_clock =
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MediumEnvironment::Instance().GetSimulatedClock();
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if (fake_clock.has_value()) {
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name_ = absl::StrFormat("G3 scheduled executor %p", this);
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(*fake_clock)->AddObserver(name_, [this]() { RunReadyTasks(); });
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}
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}
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ScheduledExecutor::~ScheduledExecutor() {
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std::optional<FakeClock*> fake_clock =
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MediumEnvironment::Instance().GetSimulatedClock();
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if (fake_clock.has_value()) {
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(*fake_clock)->RemoveObserver(name_);
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}
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executor_.Shutdown();
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}
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std::shared_ptr<api::Cancelable> ScheduledExecutor::Schedule(
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Runnable&& runnable, absl::Duration delay) {
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auto scheduled_cancelable = std::make_shared<ScheduledCancelable>();
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if (executor_.InShutdown()) {
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return scheduled_cancelable;
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}
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Runnable task = [this, scheduled_cancelable,
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runnable = std::move(runnable)]() mutable {
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if (!executor_.InShutdown() && !scheduled_cancelable->IsCanceled() &&
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scheduled_cancelable->MarkExecuted()) {
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runnable();
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}
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};
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std::optional<FakeClock*> fake_clock =
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MediumEnvironment::Instance().GetSimulatedClock();
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if (fake_clock.has_value()) {
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absl::Time trigger_time = (*fake_clock)->Now() + delay;
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absl::MutexLock lock(mutex_);
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tasks_.insert(std::pair<absl::Time, std::unique_ptr<Runnable>>(
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trigger_time, std::make_unique<Runnable>(std::move(task))));
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} else {
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executor_.ScheduleAfter(delay, std::move(task));
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}
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return scheduled_cancelable;
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}
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void ScheduledExecutor::RunReadyTasks() {
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std::optional<FakeClock*> fake_clock =
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MediumEnvironment::Instance().GetSimulatedClock();
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if (executor_.InShutdown()) {
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return;
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}
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if (!fake_clock.has_value()) {
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return;
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}
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absl::Time current_time = (*fake_clock)->Now();
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absl::MutexLock lock(mutex_);
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for (auto it = tasks_.begin(); it != tasks_.end();) {
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if (it->first <= current_time) {
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executor_.Execute(
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[task = std::move(it->second)]() mutable { (*task)(); });
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it = tasks_.erase(it);
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} else {
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// Tasks are sorted. We can stop iterating.
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break;
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}
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}
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}
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} // namespace g3
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} // namespace nearby
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