File: task_time_observer.h

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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef BASE_TASK_SEQUENCE_MANAGER_TASK_TIME_OBSERVER_H_
#define BASE_TASK_SEQUENCE_MANAGER_TASK_TIME_OBSERVER_H_

#include "base/base_export.h"
#include "base/observer_list_types.h"
#include "base/time/time.h"

namespace base {
namespace sequence_manager {

// TaskTimeObserver provides an API for observing completion of tasks.
class BASE_EXPORT TaskTimeObserver : public CheckedObserver {
 public:
  TaskTimeObserver() = default;
  TaskTimeObserver(const TaskTimeObserver&) = delete;
  TaskTimeObserver& operator=(const TaskTimeObserver&) = delete;
  ~TaskTimeObserver() override;

  // To be called when task is about to start.
  virtual void WillProcessTask(TimeTicks start_time) = 0;

  // To be called when task is completed.
  virtual void DidProcessTask(TimeTicks start_time, TimeTicks end_time) = 0;
};

}  // namespace sequence_manager
}  // namespace base

#endif  // BASE_TASK_SEQUENCE_MANAGER_TASK_TIME_OBSERVER_H_