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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 // Histogram is an object that aggregates statistics, and can summarize them in | 5 // Histogram is an object that aggregates statistics, and can summarize them in |
6 // various forms, including ASCII graphical, HTML, and numerically (as a | 6 // various forms, including ASCII graphical, HTML, and numerically (as a |
7 // vector of numbers corresponding to each of the aggregating buckets). | 7 // vector of numbers corresponding to each of the aggregating buckets). |
8 | 8 |
9 // It supports calls to accumulate either time intervals (which are processed | 9 // It supports calls to accumulate either time intervals (which are processed |
10 // as integral number of milliseconds), or arbitrary integral units. | 10 // as integral number of milliseconds), or arbitrary integral units. |
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197 // HistogramBase implementation: | 197 // HistogramBase implementation: |
198 uint64_t name_hash() const override; | 198 uint64_t name_hash() const override; |
199 HistogramType GetHistogramType() const override; | 199 HistogramType GetHistogramType() const override; |
200 bool HasConstructionArguments(Sample expected_minimum, | 200 bool HasConstructionArguments(Sample expected_minimum, |
201 Sample expected_maximum, | 201 Sample expected_maximum, |
202 uint32_t expected_bucket_count) const override; | 202 uint32_t expected_bucket_count) const override; |
203 void Add(Sample value) override; | 203 void Add(Sample value) override; |
204 void AddCount(Sample value, int count) override; | 204 void AddCount(Sample value, int count) override; |
205 std::unique_ptr<HistogramSamples> SnapshotSamples() const override; | 205 std::unique_ptr<HistogramSamples> SnapshotSamples() const override; |
206 std::unique_ptr<HistogramSamples> SnapshotDelta() override; | 206 std::unique_ptr<HistogramSamples> SnapshotDelta() override; |
| 207 std::unique_ptr<HistogramSamples> SnapshotFinalDelta() const override; |
207 void AddSamples(const HistogramSamples& samples) override; | 208 void AddSamples(const HistogramSamples& samples) override; |
208 bool AddSamplesFromPickle(base::PickleIterator* iter) override; | 209 bool AddSamplesFromPickle(base::PickleIterator* iter) override; |
209 void WriteHTMLGraph(std::string* output) const override; | 210 void WriteHTMLGraph(std::string* output) const override; |
210 void WriteAscii(std::string* output) const override; | 211 void WriteAscii(std::string* output) const override; |
211 | 212 |
212 protected: | 213 protected: |
213 // This class, defined entirely within the .cc file, contains all the | 214 // This class, defined entirely within the .cc file, contains all the |
214 // common logic for building a Histogram and can be overridden by more | 215 // common logic for building a Histogram and can be overridden by more |
215 // specific types to alter details of how the creation is done. It is | 216 // specific types to alter details of how the creation is done. It is |
216 // defined as an embedded class (rather than an anonymous one) so it | 217 // defined as an embedded class (rather than an anonymous one) so it |
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306 Sample declared_min_; // Less than this goes into the first bucket. | 307 Sample declared_min_; // Less than this goes into the first bucket. |
307 Sample declared_max_; // Over this goes into the last bucket. | 308 Sample declared_max_; // Over this goes into the last bucket. |
308 | 309 |
309 // Finally, provide the state that changes with the addition of each new | 310 // Finally, provide the state that changes with the addition of each new |
310 // sample. | 311 // sample. |
311 std::unique_ptr<SampleVector> samples_; | 312 std::unique_ptr<SampleVector> samples_; |
312 | 313 |
313 // Also keep a previous uploaded state for calculating deltas. | 314 // Also keep a previous uploaded state for calculating deltas. |
314 std::unique_ptr<HistogramSamples> logged_samples_; | 315 std::unique_ptr<HistogramSamples> logged_samples_; |
315 | 316 |
| 317 // Flag to indicate if PrepareFinalDelta has been previously called. It is |
| 318 // used to DCHECK that a final delta is not created multiple times. |
| 319 mutable bool final_delta_created_ = false; |
| 320 |
316 DISALLOW_COPY_AND_ASSIGN(Histogram); | 321 DISALLOW_COPY_AND_ASSIGN(Histogram); |
317 }; | 322 }; |
318 | 323 |
319 //------------------------------------------------------------------------------ | 324 //------------------------------------------------------------------------------ |
320 | 325 |
321 // LinearHistogram is a more traditional histogram, with evenly spaced | 326 // LinearHistogram is a more traditional histogram, with evenly spaced |
322 // buckets. | 327 // buckets. |
323 class BASE_EXPORT LinearHistogram : public Histogram { | 328 class BASE_EXPORT LinearHistogram : public Histogram { |
324 public: | 329 public: |
325 ~LinearHistogram() override; | 330 ~LinearHistogram() override; |
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538 static HistogramBase* DeserializeInfoImpl(base::PickleIterator* iter); | 543 static HistogramBase* DeserializeInfoImpl(base::PickleIterator* iter); |
539 | 544 |
540 static bool ValidateCustomRanges(const std::vector<Sample>& custom_ranges); | 545 static bool ValidateCustomRanges(const std::vector<Sample>& custom_ranges); |
541 | 546 |
542 DISALLOW_COPY_AND_ASSIGN(CustomHistogram); | 547 DISALLOW_COPY_AND_ASSIGN(CustomHistogram); |
543 }; | 548 }; |
544 | 549 |
545 } // namespace base | 550 } // namespace base |
546 | 551 |
547 #endif // BASE_METRICS_HISTOGRAM_H_ | 552 #endif // BASE_METRICS_HISTOGRAM_H_ |
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