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https://github.com/kidfromjupiter/nearby.git
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96 lines
2.6 KiB
C++
96 lines
2.6 KiB
C++
// Copyright 2021 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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#ifndef PLATFORM_IMPL_G3_TIMER_H_
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#define PLATFORM_IMPL_G3_TIMER_H_
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#include <atomic>
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#include <memory>
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#include <utility>
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#include "absl/base/nullability.h"
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#include "absl/base/thread_annotations.h"
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#include "absl/functional/any_invocable.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/implementation/scheduled_executor.h"
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#include "internal/platform/implementation/timer.h"
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namespace nearby {
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namespace g3 {
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class Timer : public api::Timer {
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public:
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explicit Timer(api::ScheduledExecutor* absl_nonnull executor)
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: executor_(executor) {};
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~Timer() override {
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Stop();
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};
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bool Create(int delay, int interval,
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absl::AnyInvocable<void()> callback) override {
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if (delay < 0 || interval < 0 || callback == nullptr) {
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return false;
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}
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interval_ = absl::Milliseconds(interval);
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callback_ = std::move(callback);
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is_stopped_ = false;
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return Schedule(absl::Milliseconds(delay));
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}
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bool Stop() override {
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is_stopped_ = true;
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absl::MutexLock lock(mutex_);
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if (task_) {
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bool result = task_->Cancel();
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task_.reset();
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return result;
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}
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return true;
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}
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private:
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bool Schedule(absl::Duration delay) {
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absl::MutexLock lock(mutex_);
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if (is_stopped_) {
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return false;
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}
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task_ = executor_->Schedule([this]() { TriggerCallback(); }, delay);
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return true;
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}
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void TriggerCallback() {
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if (is_stopped_) return;
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// If interval is 0, timer is one shot.
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if (interval_ != absl::ZeroDuration()) {
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Schedule(interval_);
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}
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callback_();
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}
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private:
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absl::Mutex mutex_;
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absl::AnyInvocable<void()> callback_;
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std::atomic_bool is_stopped_;
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absl::Duration interval_;
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std::shared_ptr<api::Cancelable> task_ ABSL_GUARDED_BY(mutex_);
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api::ScheduledExecutor* absl_nonnull const executor_;
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};
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} // namespace g3
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} // namespace nearby
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#endif // PLATFORM_IMPL_G3_TIMER_H_
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