mirror of
https://github.com/kidfromjupiter/nearby.git
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120 lines
3.4 KiB
C++
120 lines
3.4 KiB
C++
// Copyright 2022 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/task_runner_impl.h"
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#include <cstdint>
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#include <memory>
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#include <utility>
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#include "absl/container/flat_hash_map.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/crypto.h"
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#include "internal/platform/multi_thread_executor.h"
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#include "internal/platform/single_thread_executor.h"
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#include "internal/platform/timer.h"
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#include "internal/platform/timer_impl.h"
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namespace nearby {
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TaskRunnerImpl::TaskRunnerImpl(uint32_t runner_count) {
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if (runner_count == 1) {
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executor_ = std::make_unique<SingleThreadExecutor>();
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} else {
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executor_ = std::make_unique<MultiThreadExecutor>(runner_count);
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}
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}
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TaskRunnerImpl::~TaskRunnerImpl() {
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{
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absl::MutexLock lock(&mutex_);
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if (closed_) {
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return;
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}
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}
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Shutdown();
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}
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void TaskRunnerImpl::Shutdown() {
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absl::flat_hash_map<uint64_t, std::unique_ptr<Timer>> timers;
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{
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absl::MutexLock lock(&mutex_);
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closed_ = true;
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timers = std::move(timers_map_);
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}
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for (auto& timer : timers) {
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timer.second->Stop();
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}
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// We expect that all timers are stopped, no new timers will be added, and the
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// timer callbacks are not running.
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executor_->Shutdown();
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}
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bool TaskRunnerImpl::PostTask(absl::AnyInvocable<void()> task) {
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{
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absl::MutexLock lock(&mutex_);
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if (closed_) {
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return false;
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}
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}
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if (task) {
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// Because of cannot get the executor status from platform API, just returns
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// true after calling the Execute method.
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executor_->Execute(std::move(task));
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}
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return true;
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}
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bool TaskRunnerImpl::PostDelayedTask(absl::Duration delay,
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absl::AnyInvocable<void()> task) {
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absl::MutexLock lock(&mutex_);
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if (closed_) {
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return false;
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}
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if (!task) {
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return true;
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}
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uint64_t id = GenerateId();
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std::unique_ptr<Timer> timer = std::make_unique<TimerImpl>();
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if (timer->Start(absl::ToInt64Milliseconds(delay), 0,
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[this, id, task = std::move(task)]() mutable {
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std::unique_ptr<Timer> timer;
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{
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absl::MutexLock lock(&mutex_);
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if (closed_) {
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return;
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}
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timer = std::move(timers_map_.extract(id).mapped());
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}
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PostTask(std::move(task));
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// We can't destroy the timer directly from the timer
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// callback.
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if (timer) {
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PostTask([timer = std::move(timer)]() {});
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}
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})) {
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timers_map_.emplace(id, std::move(timer));
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return true;
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}
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return false;
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}
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uint64_t TaskRunnerImpl::GenerateId() { return nearby::RandData<uint64_t>(); }
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} // namespace nearby
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