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1 // Copyright (c) 2010 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/metrics/stats_table.h" | 12 #include "base/metrics/stats_table.h" |
12 #include "base/time.h" | 13 #include "base/time.h" |
13 | 14 |
14 namespace base { | 15 namespace base { |
15 | 16 |
16 // StatsCounters are dynamically created values which can be tracked in | 17 // StatsCounters are dynamically created values which can be tracked in |
17 // the StatsTable. They are designed to be lightweight to create and | 18 // the StatsTable. They are designed to be lightweight to create and |
18 // easy to use. | 19 // easy to use. |
19 // | 20 // |
20 // 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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67 #else // NDEBUG | 68 #else // NDEBUG |
68 | 69 |
69 #define DSTATS_COUNTER(name, delta) do {} while (0) | 70 #define DSTATS_COUNTER(name, delta) do {} while (0) |
70 #define DSIMPLE_STATS_COUNTER(name) do {} while (0) | 71 #define DSIMPLE_STATS_COUNTER(name) do {} while (0) |
71 #define DRATE_COUNTER(name, duration) do {} while (0) | 72 #define DRATE_COUNTER(name, duration) do {} while (0) |
72 | 73 |
73 #endif // NDEBUG | 74 #endif // NDEBUG |
74 | 75 |
75 //------------------------------------------------------------------------------ | 76 //------------------------------------------------------------------------------ |
76 // StatsCounter represents a counter in the StatsTable class. | 77 // StatsCounter represents a counter in the StatsTable class. |
77 class StatsCounter { | 78 class BASE_API StatsCounter { |
78 public: | 79 public: |
79 // Create a StatsCounter object. | 80 // Create a StatsCounter object. |
80 explicit StatsCounter(const std::string& name); | 81 explicit StatsCounter(const std::string& name); |
81 virtual ~StatsCounter(); | 82 virtual ~StatsCounter(); |
82 | 83 |
83 // Sets the counter to a specific value. | 84 // Sets the counter to a specific value. |
84 void Set(int value); | 85 void Set(int value); |
85 | 86 |
86 // Increments the counter. | 87 // Increments the counter. |
87 void Increment() { | 88 void Increment() { |
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121 // 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) |
122 // 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 |
123 // valid across all threads and processes. | 124 // valid across all threads and processes. |
124 int32 counter_id_; | 125 int32 counter_id_; |
125 }; | 126 }; |
126 | 127 |
127 | 128 |
128 // A StatsCounterTimer is a StatsCounter which keeps a timer during | 129 // A StatsCounterTimer is a StatsCounter which keeps a timer during |
129 // the scope of the StatsCounterTimer. On destruction, it will record | 130 // the scope of the StatsCounterTimer. On destruction, it will record |
130 // its time measurement. | 131 // its time measurement. |
131 class StatsCounterTimer : protected StatsCounter { | 132 class BASE_API StatsCounterTimer : protected StatsCounter { |
132 public: | 133 public: |
133 // Constructs and starts the timer. | 134 // Constructs and starts the timer. |
134 explicit StatsCounterTimer(const std::string& name); | 135 explicit StatsCounterTimer(const std::string& name); |
135 virtual ~StatsCounterTimer(); | 136 virtual ~StatsCounterTimer(); |
136 | 137 |
137 // Start the timer. | 138 // Start the timer. |
138 void Start(); | 139 void Start(); |
139 | 140 |
140 // Stop the timer and record the results. | 141 // Stop the timer and record the results. |
141 void Stop(); | 142 void Stop(); |
142 | 143 |
143 // Returns true if the timer is running. | 144 // Returns true if the timer is running. |
144 bool Running(); | 145 bool Running(); |
145 | 146 |
146 // Accept a TimeDelta to increment. | 147 // Accept a TimeDelta to increment. |
147 virtual void AddTime(TimeDelta time); | 148 virtual void AddTime(TimeDelta time); |
148 | 149 |
149 protected: | 150 protected: |
150 // Compute the delta between start and stop, in milliseconds. | 151 // Compute the delta between start and stop, in milliseconds. |
151 void Record(); | 152 void Record(); |
152 | 153 |
153 TimeTicks start_time_; | 154 TimeTicks start_time_; |
154 TimeTicks stop_time_; | 155 TimeTicks stop_time_; |
155 }; | 156 }; |
156 | 157 |
157 // 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 |
158 // that several statistics can be produced: | 159 // that several statistics can be produced: |
159 // min, max, avg, count, total | 160 // min, max, avg, count, total |
160 class StatsRate : public StatsCounterTimer { | 161 class BASE_API StatsRate : public StatsCounterTimer { |
161 public: | 162 public: |
162 // Constructs and starts the timer. | 163 // Constructs and starts the timer. |
163 explicit StatsRate(const std::string& name); | 164 explicit StatsRate(const std::string& name); |
164 virtual ~StatsRate(); | 165 virtual ~StatsRate(); |
165 | 166 |
166 virtual void Add(int value); | 167 virtual void Add(int value); |
167 | 168 |
168 private: | 169 private: |
169 StatsCounter counter_; | 170 StatsCounter counter_; |
170 StatsCounter largest_add_; | 171 StatsCounter largest_add_; |
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187 timer_.Stop(); | 188 timer_.Stop(); |
188 } | 189 } |
189 | 190 |
190 private: | 191 private: |
191 T& timer_; | 192 T& timer_; |
192 }; | 193 }; |
193 | 194 |
194 } // namespace base | 195 } // namespace base |
195 | 196 |
196 #endif // BASE_METRICS_STATS_COUNTERS_H_ | 197 #endif // BASE_METRICS_STATS_COUNTERS_H_ |
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