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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 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 // StatisticsRecorder holds all Histograms and BucketRanges that are used by | 5 // StatisticsRecorder holds all Histograms and BucketRanges that are used by |
6 // Histograms in the system. It provides a general place for | 6 // Histograms in the system. It provides a general place for |
7 // Histograms/BucketRanges to register, and supports a global API for accessing | 7 // Histograms/BucketRanges to register, and supports a global API for accessing |
8 // (i.e., dumping, or graphing) the data. | 8 // (i.e., dumping, or graphing) the data. |
9 | 9 |
10 #ifndef BASE_METRICS_STATISTICS_RECORDER_H_ | 10 #ifndef BASE_METRICS_STATISTICS_RECORDER_H_ |
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165 static OnSampleCallback FindCallback(const std::string& histogram_name); | 165 static OnSampleCallback FindCallback(const std::string& histogram_name); |
166 | 166 |
167 // Returns the number of known histograms. | 167 // Returns the number of known histograms. |
168 static size_t GetHistogramCount(); | 168 static size_t GetHistogramCount(); |
169 | 169 |
170 // Removes a histogram from the internal set of known ones. This can be | 170 // Removes a histogram from the internal set of known ones. This can be |
171 // necessary during testing persistent histograms where the underlying | 171 // necessary during testing persistent histograms where the underlying |
172 // memory is being released. | 172 // memory is being released. |
173 static void ForgetHistogramForTesting(base::StringPiece name); | 173 static void ForgetHistogramForTesting(base::StringPiece name); |
174 | 174 |
175 // Reset any global instance of the statistics-recorder that was created | 175 // Creates a local StatisticsRecorder object for testing purposes. All new |
| 176 // histograms will be registered in it until it is destructed or pushed |
| 177 // aside for the lifetime of yet another SR object. The destruction of the |
| 178 // returned object will re-activate the previous one. Always release SR |
| 179 // objects in the opposite order to which they're created. |
| 180 static std::unique_ptr<StatisticsRecorder> CreateTemporaryForTesting() |
| 181 WARN_UNUSED_RESULT; |
| 182 |
| 183 // Resets any global instance of the statistics-recorder that was created |
176 // by a call to Initialize(). | 184 // by a call to Initialize(). |
177 static void UninitializeForTesting(); | 185 static void UninitializeForTesting(); |
178 | 186 |
179 private: | 187 private: |
180 // We keep a map of callbacks to histograms, so that as histograms are | 188 // We keep a map of callbacks to histograms, so that as histograms are |
181 // created, we can set the callback properly. | 189 // created, we can set the callback properly. |
182 typedef std::map<std::string, OnSampleCallback> CallbackMap; | 190 typedef std::map<std::string, OnSampleCallback> CallbackMap; |
183 | 191 |
184 // We keep all |bucket_ranges_| in a map, from checksum to a list of | 192 // We keep all |bucket_ranges_| in a map, from checksum to a list of |
185 // |bucket_ranges_|. Checksum is calculated from the |ranges_| in | 193 // |bucket_ranges_|. Checksum is calculated from the |ranges_| in |
186 // |bucket_ranges_|. | 194 // |bucket_ranges_|. |
187 typedef std::map<uint32_t, std::list<const BucketRanges*>*> RangesMap; | 195 typedef std::map<uint32_t, std::list<const BucketRanges*>*> RangesMap; |
188 | 196 |
189 friend struct DefaultLazyInstanceTraits<StatisticsRecorder>; | 197 friend struct DefaultLazyInstanceTraits<StatisticsRecorder>; |
190 friend class ::SubprocessMetricsProviderTest; | |
191 friend class HistogramBaseTest; | |
192 friend class HistogramSnapshotManagerTest; | |
193 friend class HistogramTest; | |
194 friend class JsonPrefStoreTest; | |
195 friend class PersistentHistogramAllocatorTest; | |
196 friend class SharedHistogramTest; | |
197 friend class SparseHistogramTest; | |
198 friend class StatisticsRecorderTest; | |
199 FRIEND_TEST_ALL_PREFIXES(HistogramDeltaSerializationTest, | |
200 DeserializeHistogramAndAddSamples); | |
201 | 198 |
202 // Imports histograms from global persistent memory. The global lock must | 199 // Imports histograms from global persistent memory. The global lock must |
203 // not be held during this call. | 200 // not be held during this call. |
204 static void ImportGlobalPersistentHistograms(); | 201 static void ImportGlobalPersistentHistograms(); |
205 | 202 |
206 // The constructor just initializes static members. Usually client code should | 203 // The constructor just initializes static members. Usually client code should |
207 // use Initialize to do this. But in test code, you can friend this class and | 204 // use Initialize to do this. But in test code, you can friend this class and |
208 // call the constructor to get a clean StatisticsRecorder. | 205 // call the constructor to get a clean StatisticsRecorder. |
209 StatisticsRecorder(); | 206 StatisticsRecorder(); |
210 | 207 |
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224 | 221 |
225 // Lock protects access to above maps. | 222 // Lock protects access to above maps. |
226 static base::Lock* lock_; | 223 static base::Lock* lock_; |
227 | 224 |
228 DISALLOW_COPY_AND_ASSIGN(StatisticsRecorder); | 225 DISALLOW_COPY_AND_ASSIGN(StatisticsRecorder); |
229 }; | 226 }; |
230 | 227 |
231 } // namespace base | 228 } // namespace base |
232 | 229 |
233 #endif // BASE_METRICS_STATISTICS_RECORDER_H_ | 230 #endif // BASE_METRICS_STATISTICS_RECORDER_H_ |
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