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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 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 CONTENT_BROWSER_DOWNLOAD_RATE_ESTIMATOR_H_ | 5 #ifndef CONTENT_BROWSER_DOWNLOAD_RATE_ESTIMATOR_H_ |
6 #define CONTENT_BROWSER_DOWNLOAD_RATE_ESTIMATOR_H_ | 6 #define CONTENT_BROWSER_DOWNLOAD_RATE_ESTIMATOR_H_ |
7 | 7 |
| 8 #include <stddef.h> |
| 9 #include <stdint.h> |
| 10 |
8 #include <string> | 11 #include <string> |
9 #include <vector> | 12 #include <vector> |
10 | 13 |
11 #include "base/basictypes.h" | |
12 #include "base/time/time.h" | 14 #include "base/time/time.h" |
13 #include "content/common/content_export.h" | 15 #include "content/common/content_export.h" |
14 | 16 |
15 namespace content { | 17 namespace content { |
16 | 18 |
17 // RateEstimator generates rate estimates based on recent activity. | 19 // RateEstimator generates rate estimates based on recent activity. |
18 // | 20 // |
19 // Internally it uses a fixed-size ring buffer, and develops estimates | 21 // Internally it uses a fixed-size ring buffer, and develops estimates |
20 // based on a small sliding window of activity. | 22 // based on a small sliding window of activity. |
21 class CONTENT_EXPORT RateEstimator { | 23 class CONTENT_EXPORT RateEstimator { |
22 public: | 24 public: |
23 RateEstimator(); | 25 RateEstimator(); |
24 RateEstimator(base::TimeDelta bucket_time, | 26 RateEstimator(base::TimeDelta bucket_time, |
25 size_t num_buckets, | 27 size_t num_buckets, |
26 base::TimeTicks now); | 28 base::TimeTicks now); |
27 ~RateEstimator(); | 29 ~RateEstimator(); |
28 | 30 |
29 // Increment the counter by |count|. The first variant uses the current time, | 31 // Increment the counter by |count|. The first variant uses the current time, |
30 // the second variant provides the time that |count| is observed. | 32 // the second variant provides the time that |count| is observed. |
31 void Increment(uint32 count); | 33 void Increment(uint32_t count); |
32 void Increment(uint32 count, base::TimeTicks now); | 34 void Increment(uint32_t count, base::TimeTicks now); |
33 | 35 |
34 // Get a rate estimate, in terms of counts/second. The first variant uses the | 36 // Get a rate estimate, in terms of counts/second. The first variant uses the |
35 // current time, the second variant provides the time. | 37 // current time, the second variant provides the time. |
36 uint64 GetCountPerSecond() const; | 38 uint64_t GetCountPerSecond() const; |
37 uint64 GetCountPerSecond(base::TimeTicks now) const; | 39 uint64_t GetCountPerSecond(base::TimeTicks now) const; |
38 | 40 |
39 private: | 41 private: |
40 void ClearOldBuckets(base::TimeTicks now); | 42 void ClearOldBuckets(base::TimeTicks now); |
41 void ResetBuckets(base::TimeTicks now); | 43 void ResetBuckets(base::TimeTicks now); |
42 | 44 |
43 std::vector<uint32> history_; | 45 std::vector<uint32_t> history_; |
44 base::TimeDelta bucket_time_; | 46 base::TimeDelta bucket_time_; |
45 size_t oldest_index_; | 47 size_t oldest_index_; |
46 size_t bucket_count_; | 48 size_t bucket_count_; |
47 base::TimeTicks oldest_time_; | 49 base::TimeTicks oldest_time_; |
48 }; | 50 }; |
49 | 51 |
50 } // namespace content | 52 } // namespace content |
51 | 53 |
52 #endif // CONTENT_BROWSER_DOWNLOAD_RATE_ESTIMATOR_H_ | 54 #endif // CONTENT_BROWSER_DOWNLOAD_RATE_ESTIMATOR_H_ |
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