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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef REMOTING_BASE_RATE_COUNTER_H_ | 5 #ifndef REMOTING_BASE_RATE_COUNTER_H_ |
6 #define REMOTING_BASE_RATE_COUNTER_H_ | 6 #define REMOTING_BASE_RATE_COUNTER_H_ |
7 | 7 |
| 8 #include <stdint.h> |
| 9 |
8 #include <queue> | 10 #include <queue> |
9 #include <utility> | 11 #include <utility> |
10 | 12 |
11 #include "base/basictypes.h" | 13 #include "base/macros.h" |
12 #include "base/threading/non_thread_safe.h" | 14 #include "base/threading/non_thread_safe.h" |
13 #include "base/time/time.h" | 15 #include "base/time/time.h" |
14 | 16 |
15 namespace remoting { | 17 namespace remoting { |
16 | 18 |
17 // Measures average rate per second of a sequence of point rate samples | 19 // Measures average rate per second of a sequence of point rate samples |
18 // over a specified time window. This can be used to measure bandwidth, frame | 20 // over a specified time window. This can be used to measure bandwidth, frame |
19 // rates, etc. | 21 // rates, etc. |
20 class RateCounter : public base::NonThreadSafe { | 22 class RateCounter : public base::NonThreadSafe { |
21 public: | 23 public: |
22 // Constructs a rate counter over the specified |time_window|. | 24 // Constructs a rate counter over the specified |time_window|. |
23 explicit RateCounter(base::TimeDelta time_window); | 25 explicit RateCounter(base::TimeDelta time_window); |
24 virtual ~RateCounter(); | 26 virtual ~RateCounter(); |
25 | 27 |
26 // Records a point event count to include in the rate. | 28 // Records a point event count to include in the rate. |
27 void Record(int64 value); | 29 void Record(int64_t value); |
28 | 30 |
29 // Returns the rate-per-second of values recorded over the time window. | 31 // Returns the rate-per-second of values recorded over the time window. |
30 // Note that rates reported before |time_window| has elapsed are not accurate. | 32 // Note that rates reported before |time_window| has elapsed are not accurate. |
31 double Rate(); | 33 double Rate(); |
32 | 34 |
33 // Overrides the current time for testing. | 35 // Overrides the current time for testing. |
34 void SetCurrentTimeForTest(base::Time current_time); | 36 void SetCurrentTimeForTest(base::Time current_time); |
35 | 37 |
36 private: | 38 private: |
37 // Type used to store data points with timestamps. | 39 // Type used to store data points with timestamps. |
38 typedef std::pair<base::Time, int64> DataPoint; | 40 typedef std::pair<base::Time, int64_t> DataPoint; |
39 | 41 |
40 // Removes data points more than |time_window| older than |current_time|. | 42 // Removes data points more than |time_window| older than |current_time|. |
41 void EvictOldDataPoints(base::Time current_time); | 43 void EvictOldDataPoints(base::Time current_time); |
42 | 44 |
43 // Returns the current time specified for test, if set, or base::Time::Now(). | 45 // Returns the current time specified for test, if set, or base::Time::Now(). |
44 base::Time CurrentTime() const; | 46 base::Time CurrentTime() const; |
45 | 47 |
46 // Time window over which to calculate the rate. | 48 // Time window over which to calculate the rate. |
47 const base::TimeDelta time_window_; | 49 const base::TimeDelta time_window_; |
48 | 50 |
49 // Queue containing data points in the order in which they were recorded. | 51 // Queue containing data points in the order in which they were recorded. |
50 std::queue<DataPoint> data_points_; | 52 std::queue<DataPoint> data_points_; |
51 | 53 |
52 // Sum of values in |data_points_|. | 54 // Sum of values in |data_points_|. |
53 int64 sum_; | 55 int64_t sum_; |
54 | 56 |
55 // If set, used to calculate the running average, in place of Now(). | 57 // If set, used to calculate the running average, in place of Now(). |
56 base::Time current_time_for_test_; | 58 base::Time current_time_for_test_; |
57 | 59 |
58 DISALLOW_COPY_AND_ASSIGN(RateCounter); | 60 DISALLOW_COPY_AND_ASSIGN(RateCounter); |
59 }; | 61 }; |
60 | 62 |
61 } // namespace remoting | 63 } // namespace remoting |
62 | 64 |
63 #endif // REMOTING_BASE_RATE_COUNTER_H_ | 65 #endif // REMOTING_BASE_RATE_COUNTER_H_ |
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