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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 BASE_METRICS_STATS_COUNTERS_H_ | 5 #ifndef BASE_METRICS_STATS_COUNTERS_H_ |
6 #define BASE_METRICS_STATS_COUNTERS_H_ | 6 #define BASE_METRICS_STATS_COUNTERS_H_ |
7 | 7 |
8 #include <string> | 8 #include <string> |
9 | 9 |
10 #include "base/base_export.h" | 10 #include "base/base_export.h" |
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126 }; | 126 }; |
127 | 127 |
128 | 128 |
129 // A StatsCounterTimer is a StatsCounter which keeps a timer during | 129 // A StatsCounterTimer is a StatsCounter which keeps a timer during |
130 // the scope of the StatsCounterTimer. On destruction, it will record | 130 // the scope of the StatsCounterTimer. On destruction, it will record |
131 // its time measurement. | 131 // its time measurement. |
132 class BASE_EXPORT StatsCounterTimer : protected StatsCounter { | 132 class BASE_EXPORT StatsCounterTimer : protected StatsCounter { |
133 public: | 133 public: |
134 // Constructs and starts the timer. | 134 // Constructs and starts the timer. |
135 explicit StatsCounterTimer(const std::string& name); | 135 explicit StatsCounterTimer(const std::string& name); |
136 virtual ~StatsCounterTimer(); | 136 ~StatsCounterTimer() override; |
137 | 137 |
138 // Start the timer. | 138 // Start the timer. |
139 void Start(); | 139 void Start(); |
140 | 140 |
141 // Stop the timer and record the results. | 141 // Stop the timer and record the results. |
142 void Stop(); | 142 void Stop(); |
143 | 143 |
144 // Returns true if the timer is running. | 144 // Returns true if the timer is running. |
145 bool Running(); | 145 bool Running(); |
146 | 146 |
147 // Accept a TimeDelta to increment. | 147 // Accept a TimeDelta to increment. |
148 virtual void AddTime(TimeDelta time); | 148 virtual void AddTime(TimeDelta time); |
149 | 149 |
150 protected: | 150 protected: |
151 // Compute the delta between start and stop, in milliseconds. | 151 // Compute the delta between start and stop, in milliseconds. |
152 void Record(); | 152 void Record(); |
153 | 153 |
154 TimeTicks start_time_; | 154 TimeTicks start_time_; |
155 TimeTicks stop_time_; | 155 TimeTicks stop_time_; |
156 }; | 156 }; |
157 | 157 |
158 // A StatsRate is a timer that keeps a count of the number of intervals added so | 158 // A StatsRate is a timer that keeps a count of the number of intervals added so |
159 // that several statistics can be produced: | 159 // that several statistics can be produced: |
160 // min, max, avg, count, total | 160 // min, max, avg, count, total |
161 class BASE_EXPORT StatsRate : public StatsCounterTimer { | 161 class BASE_EXPORT StatsRate : public StatsCounterTimer { |
162 public: | 162 public: |
163 // Constructs and starts the timer. | 163 // Constructs and starts the timer. |
164 explicit StatsRate(const std::string& name); | 164 explicit StatsRate(const std::string& name); |
165 virtual ~StatsRate(); | 165 ~StatsRate() override; |
166 | 166 |
167 virtual void Add(int value) override; | 167 void Add(int value) override; |
168 | 168 |
169 private: | 169 private: |
170 StatsCounter counter_; | 170 StatsCounter counter_; |
171 StatsCounter largest_add_; | 171 StatsCounter largest_add_; |
172 }; | 172 }; |
173 | 173 |
174 | 174 |
175 // Helper class for scoping a timer or rate. | 175 // Helper class for scoping a timer or rate. |
176 template<class T> class StatsScope { | 176 template<class T> class StatsScope { |
177 public: | 177 public: |
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188 timer_.Stop(); | 188 timer_.Stop(); |
189 } | 189 } |
190 | 190 |
191 private: | 191 private: |
192 T& timer_; | 192 T& timer_; |
193 }; | 193 }; |
194 | 194 |
195 } // namespace base | 195 } // namespace base |
196 | 196 |
197 #endif // BASE_METRICS_STATS_COUNTERS_H_ | 197 #endif // BASE_METRICS_STATS_COUNTERS_H_ |
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