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