external_time_controller.h

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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.

*/

#ifndef TEST_TIME_CONTROLLER_EXTERNAL_TIME_CONTROLLER_H_

#define TEST_TIME_CONTROLLER_EXTERNAL_TIME_CONTROLLER_H_

#include <functional>

#include <memory>

#include "absl/strings/string_view.h"

#include "api/task_queue/task_queue_base.h"

#include "api/task_queue/task_queue_factory.h"

#include "api/test/time_controller.h"

#include "api/units/time_delta.h"

#include "api/units/timestamp.h"

#include "system_wrappers/include/clock.h"

#include "test/time_controller/simulated_time_controller.h"

namespace webrtc {

// TimeController implementation built on an external controlled alarm.

// This implementation is used to delegate scheduling and execution to an

// external run loop.

class ExternalTimeController : public TimeController, public TaskQueueFactory {

 public:

  explicit ExternalTimeController(ControlledAlarmClock* alarm);

  // Implementation of TimeController.

  Clock* GetClock() override;

  TaskQueueFactory* GetTaskQueueFactory() override;

  void AdvanceTime(TimeDelta duration) override;

  std::unique_ptr<rtc::Thread> CreateThread(

      const std::string& name,

      std::unique_ptr<rtc::SocketServer> socket_server) override;

  rtc::Thread* GetMainThread() override;

  // Implementation of TaskQueueFactory.

  std::unique_ptr<TaskQueueBase, TaskQueueDeleter> CreateTaskQueue(

      absl::string_view name,

      TaskQueueFactory::Priority priority) const override;

 private:

  class TaskQueueWrapper;

  // Executes any tasks scheduled at or before the current time.  May call

  // `ScheduleNext` to schedule the next call to `Run`.

  void Run();

  void UpdateTime();

  void ScheduleNext();

  ControlledAlarmClock* alarm_;

  sim_time_impl::SimulatedTimeControllerImpl impl_;

  rtc::ScopedYieldPolicy yield_policy_;

  // Overrides the global rtc::Clock to ensure that it reports the same times as

  // the time controller.

  rtc::ScopedBaseFakeClock global_clock_;

};

}  // namespace webrtc

#endif  // TEST_TIME_CONTROLLER_EXTERNAL_TIME_CONTROLLER_H_