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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 #pragma once | 7 #pragma once |
| 8 | 8 |
| 9 #include <string> | 9 #include <string> |
| 10 | 10 |
| 11 #include "base/base_api.h" | 11 #include "base/base_export.h" |
| 12 #include "base/metrics/stats_table.h" | 12 #include "base/metrics/stats_table.h" |
| 13 #include "base/time.h" | 13 #include "base/time.h" |
| 14 | 14 |
| 15 namespace base { | 15 namespace base { |
| 16 | 16 |
| 17 // StatsCounters are dynamically created values which can be tracked in | 17 // StatsCounters are dynamically created values which can be tracked in |
| 18 // the StatsTable. They are designed to be lightweight to create and | 18 // the StatsTable. They are designed to be lightweight to create and |
| 19 // easy to use. | 19 // easy to use. |
| 20 // | 20 // |
| 21 // Since StatsCounters can be created dynamically by name, there is | 21 // Since StatsCounters can be created dynamically by name, there is |
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| 68 #else // NDEBUG | 68 #else // NDEBUG |
| 69 | 69 |
| 70 #define DSTATS_COUNTER(name, delta) do {} while (0) | 70 #define DSTATS_COUNTER(name, delta) do {} while (0) |
| 71 #define DSIMPLE_STATS_COUNTER(name) do {} while (0) | 71 #define DSIMPLE_STATS_COUNTER(name) do {} while (0) |
| 72 #define DRATE_COUNTER(name, duration) do {} while (0) | 72 #define DRATE_COUNTER(name, duration) do {} while (0) |
| 73 | 73 |
| 74 #endif // NDEBUG | 74 #endif // NDEBUG |
| 75 | 75 |
| 76 //------------------------------------------------------------------------------ | 76 //------------------------------------------------------------------------------ |
| 77 // StatsCounter represents a counter in the StatsTable class. | 77 // StatsCounter represents a counter in the StatsTable class. |
| 78 class BASE_API StatsCounter { | 78 class BASE_EXPORT StatsCounter { |
| 79 public: | 79 public: |
| 80 // Create a StatsCounter object. | 80 // Create a StatsCounter object. |
| 81 explicit StatsCounter(const std::string& name); | 81 explicit StatsCounter(const std::string& name); |
| 82 virtual ~StatsCounter(); | 82 virtual ~StatsCounter(); |
| 83 | 83 |
| 84 // Sets the counter to a specific value. | 84 // Sets the counter to a specific value. |
| 85 void Set(int value); | 85 void Set(int value); |
| 86 | 86 |
| 87 // Increments the counter. | 87 // Increments the counter. |
| 88 void Increment() { | 88 void Increment() { |
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| 122 // The counter id in the table. We initialize to -1 (an invalid value) | 122 // The counter id in the table. We initialize to -1 (an invalid value) |
| 123 // and then cache it once it has been looked up. The counter_id is | 123 // and then cache it once it has been looked up. The counter_id is |
| 124 // valid across all threads and processes. | 124 // valid across all threads and processes. |
| 125 int32 counter_id_; | 125 int32 counter_id_; |
| 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_API 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 virtual ~StatsCounterTimer(); |
| 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_API 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 virtual ~StatsRate(); |
| 166 | 166 |
| 167 virtual void Add(int value); | 167 virtual void Add(int value); |
| 168 | 168 |
| 169 private: | 169 private: |
| 170 StatsCounter counter_; | 170 StatsCounter counter_; |
| 171 StatsCounter largest_add_; | 171 StatsCounter largest_add_; |
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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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