| // 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 CONTENT_BROWSER_SCHEDULER_RESPONSIVENESS_MESSAGE_LOOP_OBSERVER_H_ |
| #define CONTENT_BROWSER_SCHEDULER_RESPONSIVENESS_MESSAGE_LOOP_OBSERVER_H_ |
| |
| #include "base/macros.h" |
| #include "base/task/task_observer.h" |
| #include "content/common/content_export.h" |
| |
| namespace base { |
| struct PendingTask; |
| } // namespace base |
| |
| namespace content { |
| namespace responsiveness { |
| |
| // This object is not thread safe. It must be constructed and destroyed on the |
| // same thread. The callbacks will occur synchronously from WillProcessTask() |
| // and DidProcessTask(). |
| class CONTENT_EXPORT MessageLoopObserver : base::TaskObserver { |
| public: |
| using WillProcessTaskCallback = |
| base::RepeatingCallback<void(const base::PendingTask* task, |
| bool was_blocked_or_low_priority)>; |
| using DidProcessTaskCallback = |
| base::RepeatingCallback<void(const base::PendingTask* task)>; |
| |
| // The constructor will register the object as an observer of the current |
| // MessageLoop. The destructor will unregister the object. |
| MessageLoopObserver(WillProcessTaskCallback will_process_task_callback, |
| DidProcessTaskCallback did_process_task_callback); |
| ~MessageLoopObserver() override; |
| |
| private: |
| void WillProcessTask(const base::PendingTask& pending_task, |
| bool was_blocked_or_low_priority) override; |
| void DidProcessTask(const base::PendingTask& pending_task) override; |
| |
| const WillProcessTaskCallback will_process_task_callback_; |
| const DidProcessTaskCallback did_process_task_callback_; |
| |
| DISALLOW_COPY_AND_ASSIGN(MessageLoopObserver); |
| }; |
| |
| } // namespace responsiveness |
| } // namespace content |
| |
| #endif // CONTENT_BROWSER_SCHEDULER_RESPONSIVENESS_MESSAGE_LOOP_OBSERVER_H_ |