mirror of
https://github.com/kidfromjupiter/nearby.git
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85 lines
2.5 KiB
C++
85 lines
2.5 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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#ifndef PLATFORM_PUBLIC_CANCELABLE_ALARM_H_
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#define PLATFORM_PUBLIC_CANCELABLE_ALARM_H_
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#include <string>
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#include <utility>
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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/strings/string_view.h"
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#include "internal/platform/cancelable.h"
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#include "internal/platform/mutex.h"
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#include "internal/platform/mutex_lock.h"
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#include "absl/time/time.h"
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#include "internal/platform/scheduled_executor.h"
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namespace nearby {
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/**
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* A cancelable alarm with a name. This is a simple wrapper around the logic
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* for posting a Runnable on a ScheduledExecutor and (possibly) later
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* canceling it.
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*/
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class CancelableAlarm {
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public:
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CancelableAlarm() = default;
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CancelableAlarm(absl::string_view name, absl::AnyInvocable<void()>&& runnable,
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absl::Duration delay, ScheduledExecutor* scheduled_executor,
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bool is_recurring = false)
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: name_(name), scheduled_executor_(scheduled_executor), delay_(delay) {
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if (is_recurring) {
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runnable_ = std::move(runnable);
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Schedule();
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} else {
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cancelable_ = scheduled_executor_->Schedule(std::move(runnable), delay_);
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}
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}
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~CancelableAlarm() = default;
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bool Cancel() ABSL_LOCKS_EXCLUDED(mutex_) {
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MutexLock lock(&mutex_);
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return cancelable_.Cancel();
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}
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bool IsValid() ABSL_LOCKS_EXCLUDED(mutex_) {
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MutexLock lock(&mutex_);
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return cancelable_.IsValid();
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}
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private:
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void Schedule() ABSL_LOCKS_EXCLUDED(mutex_) {
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MutexLock lock(&mutex_);
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cancelable_ = scheduled_executor_->Schedule(
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[this]() {
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runnable_();
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Schedule();
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},
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delay_);
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}
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Mutex mutex_;
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std::string name_;
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Cancelable cancelable_ ABSL_GUARDED_BY(mutex_);
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ScheduledExecutor* scheduled_executor_;
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absl::Duration delay_;
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absl::AnyInvocable<void()> runnable_;
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};
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} // namespace nearby
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#endif // PLATFORM_PUBLIC_CANCELABLE_ALARM_H_
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