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base / task / sequence_manager / task_time_observer.h [blame]
// 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_