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1 // Copyright 2016 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef COMPONENTS_SCHEDULER_RENDERER_QUEUEING_TIME_ESTIMATOR_H_ | |
6 #define COMPONENTS_SCHEDULER_RENDERER_QUEUEING_TIME_ESTIMATOR_H_ | |
7 | |
8 #include "base/macros.h" | |
9 #include "base/message_loop/message_loop.h" | |
10 #include "base/time/time.h" | |
11 #include "cc/base/rolling_time_delta_history.h" | |
12 #include "components/scheduler/scheduler_export.h" | |
13 | |
14 namespace base { | |
15 class TickClock; | |
16 } | |
17 | |
18 namespace scheduler { | |
19 | |
20 // Records the expected queueing time for a high priority task occurring | |
21 // randomly during each interval of length |window_duration|. | |
22 class SCHEDULER_EXPORT QueueingTimeEstimator | |
23 : public base::MessageLoop::TaskObserver { | |
24 public: | |
25 class QueueingTimeEstimatorClient { | |
Sami
2016/04/20 09:51:27
naming nit: This could just be called |Client| sin
tdresser
2016/04/20 15:13:33
Done.
| |
26 public: | |
Sami
2016/04/20 09:51:27
Please add a virtual destructor.
tdresser
2016/04/20 15:13:32
Done.
| |
27 virtual void OnQueueingTimeForWindowEstimated( | |
28 base::TimeDelta queueing_time) = 0; | |
29 }; | |
30 | |
31 QueueingTimeEstimator(QueueingTimeEstimatorClient* client, | |
32 base::TickClock* time_source, | |
33 base::TimeDelta window_duration); | |
34 ~QueueingTimeEstimator() override; | |
35 | |
36 // TaskObserver implementation: | |
37 void WillProcessTask(const base::PendingTask& pending_task) override; | |
38 void DidProcessTask(const base::PendingTask& pending_task) override; | |
39 | |
40 private: | |
41 QueueingTimeEstimatorClient* client_; // NOT OWNED. | |
42 base::TickClock* time_source_; // NOT OWNED. | |
43 int outstanding_task_count_; | |
44 | |
45 base::TimeTicks task_start_time_; | |
46 base::TimeDelta current_expected_queueing_time_; | |
47 base::TimeDelta window_duration_; | |
48 base::TimeTicks window_start_time_; | |
49 | |
50 DISALLOW_COPY_AND_ASSIGN(QueueingTimeEstimator); | |
51 }; | |
52 | |
53 } // namespace scheduler | |
54 | |
55 #endif // COMPONENTS_SCHEDULER_RENDERER_QUEUEING_TIME_ESTIMATOR_H_ | |
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