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/*
* Copyright 2019 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "test/time_controller/external_time_controller.h"
#include <algorithm>
#include <map>
#include <memory>
#include <utility>
#include "absl/functional/any_invocable.h"
#include "api/task_queue/task_queue_base.h"
#include "api/task_queue/task_queue_factory.h"
#include "api/units/time_delta.h"
#include "api/units/timestamp.h"
#include "rtc_base/checks.h"
#include "rtc_base/synchronization/yield_policy.h"
#include "test/time_controller/simulated_time_controller.h"
namespace webrtc {
// Wraps a TaskQueue so that it can reschedule the time controller whenever
// an external call schedules a new task.
class ExternalTimeController::TaskQueueWrapper : public TaskQueueBase {
public:
TaskQueueWrapper(ExternalTimeController* parent,
std::unique_ptr<TaskQueueBase, TaskQueueDeleter> base)
: parent_(parent), base_(std::move(base)) {}
void PostTask(absl::AnyInvocable<void() &&> task) override {
parent_->UpdateTime();
base_->PostTask(TaskWrapper(std::move(task)));
parent_->ScheduleNext();
}
void PostDelayedTask(absl::AnyInvocable<void() &&> task,
TimeDelta delay) override {
parent_->UpdateTime();
base_->PostDelayedTask(TaskWrapper(std::move(task)), delay);
parent_->ScheduleNext();
}
void PostDelayedHighPrecisionTask(absl::AnyInvocable<void() &&> task,
TimeDelta delay) override {
parent_->UpdateTime();
base_->PostDelayedHighPrecisionTask(TaskWrapper(std::move(task)), delay);
parent_->ScheduleNext();
}
void Delete() override { delete this; }
private:
absl::AnyInvocable<void() &&> TaskWrapper(
absl::AnyInvocable<void() &&> task) {
return [task = std::move(task), this]() mutable {
CurrentTaskQueueSetter current(this);
std::move(task)();
};
}
ExternalTimeController* const parent_;
std::unique_ptr<TaskQueueBase, TaskQueueDeleter> base_;
};
ExternalTimeController::ExternalTimeController(ControlledAlarmClock* alarm)
: alarm_(alarm),
impl_(alarm_->GetClock()->CurrentTime()),
yield_policy_(&impl_) {
global_clock_.SetTime(alarm_->GetClock()->CurrentTime());
alarm_->SetCallback([this] { Run(); });
}
Clock* ExternalTimeController::GetClock() {
return alarm_->GetClock();
}
TaskQueueFactory* ExternalTimeController::GetTaskQueueFactory() {
return this;
}
void ExternalTimeController::AdvanceTime(TimeDelta duration) {
alarm_->Sleep(duration);
}
std::unique_ptr<rtc::Thread> ExternalTimeController::CreateThread(
const std::string& name,
std::unique_ptr<rtc::SocketServer> socket_server) {
RTC_DCHECK_NOTREACHED();
return nullptr;
}
rtc::Thread* ExternalTimeController::GetMainThread() {
RTC_DCHECK_NOTREACHED();
return nullptr;
}
std::unique_ptr<TaskQueueBase, TaskQueueDeleter>
ExternalTimeController::CreateTaskQueue(
absl::string_view name,
TaskQueueFactory::Priority priority) const {
return std::unique_ptr<TaskQueueBase, TaskQueueDeleter>(
new TaskQueueWrapper(const_cast<ExternalTimeController*>(this),
impl_.CreateTaskQueue(name, priority)));
}
void ExternalTimeController::Run() {
rtc::ScopedYieldPolicy yield_policy(&impl_);
UpdateTime();
impl_.RunReadyRunners();
ScheduleNext();
}
void ExternalTimeController::UpdateTime() {
Timestamp now = alarm_->GetClock()->CurrentTime();
impl_.AdvanceTime(now);
global_clock_.SetTime(now);
}
void ExternalTimeController::ScheduleNext() {
RTC_DCHECK_EQ(impl_.CurrentTime(), alarm_->GetClock()->CurrentTime());
TimeDelta delay =
std::max(impl_.NextRunTime() - impl_.CurrentTime(), TimeDelta::Zero());
if (delay.IsFinite()) {
alarm_->ScheduleAlarmAt(alarm_->GetClock()->CurrentTime() + delay);
}
}
} // namespace webrtc
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