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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_TASK_TASK_OBSERVER_H_
#define BASE_TASK_TASK_OBSERVER_H_
#include "base/base_export.h"
#include "base/pending_task.h"
namespace base {
// A TaskObserver is an object that receives notifications about tasks being
// processed on the thread it's associated with.
//
// NOTE: A TaskObserver implementation should be extremely fast!
class BASE_EXPORT TaskObserver {
public:
// This method is called before processing a task.
// |was_blocked_or_low_priority| indicates if the task was at some point in a
// queue that was blocked or less important than "normal".
virtual void WillProcessTask(const PendingTask& pending_task,
bool was_blocked_or_low_priority) = 0;
// This method is called after processing a task.
virtual void DidProcessTask(const PendingTask& pending_task) = 0;
protected:
virtual ~TaskObserver() = default;
};
} // namespace base
#endif // BASE_TASK_TASK_OBSERVER_H_
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