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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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