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https://github.com/kidfromjupiter/nearby.git
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101 lines
3.0 KiB
C++
101 lines
3.0 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_IMPL_LINUX_SCHEDULED_EXECUTOR_H_
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#define PLATFORM_IMPL_LINUX_SCHEDULED_EXECUTOR_H_
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#include <memory>
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#include <utility>
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#include <vector>
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#include "absl/synchronization/notification.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/linux/executor.h"
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#include "internal/platform/implementation/scheduled_executor.h"
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namespace nearby {
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namespace linux {
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#define TIMER_NAME_BUFFER_SIZE 64
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// An Executor that can schedule commands to run after a given delay, or to
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// execute periodically.
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//
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// https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ScheduledExecutorService.html
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class ScheduledExecutor : public api::ScheduledExecutor {
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public:
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ScheduledExecutor();
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~ScheduledExecutor() override = default;
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// Cancelable is kept both in the executor context, and in the caller context.
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// We want Cancelable to live until both caller and executor are done with it.
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// Exclusive ownership model does not work for this case;
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// using std:shared_ptr<> instead if std::unique_ptr<>.
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std::shared_ptr<api::Cancelable> Schedule(Runnable&& runnable,
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absl::Duration duration) override;
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// Executes the runnable task immedately.
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void Execute(Runnable&& runnable) override;
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// Shutdowns the executor, all scheduled task will be cancelled.
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void Shutdown() override;
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private:
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class ScheduledTask : public api::Cancelable {
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public:
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explicit ScheduledTask(Runnable&& task, absl::Duration duration)
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: task_(std::move(task)), duration_(duration) {}
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bool Cancel() override {
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if (is_executed_ || is_cancelled_) {
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return false;
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}
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is_cancelled_ = true;
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notification_.Notify();
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return true;
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};
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void Start() {
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if (is_executed_ ||
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notification_.WaitForNotificationWithTimeout(duration_)) {
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return;
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}
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is_executed_ = true;
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task_();
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}
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bool IsDone() const { return is_cancelled_ || is_executed_; }
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private:
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Runnable task_;
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absl::Duration duration_;
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absl::Notification notification_;
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bool is_cancelled_ = false;
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bool is_executed_ = false;
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};
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std::unique_ptr<nearby::linux::Executor> executor_ = nullptr;
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std::vector<std::shared_ptr<ScheduledTask>> scheduled_tasks_;
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std::atomic_bool shut_down_ = false;
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};
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} // namespace linux
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} // namespace nearby
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#endif // PLATFORM_IMPL_LINUX_SCHEDULED_EXECUTOR_H_
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