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Side by Side Diff: base/metrics/histogram.h

Issue 1880803003: Display histograms from subprocesses in chrome://histograms (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: rebased Created 4 years, 8 months ago
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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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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 void AddSamples(const HistogramSamples& samples) override; 207 void AddSamples(const HistogramSamples& samples) override;
208 bool AddSamplesFromPickle(base::PickleIterator* iter) override; 208 bool AddSamplesFromPickle(base::PickleIterator* iter) override;
209 void WriteHTMLGraph(std::string* output) const override; 209 void WriteHTMLGraph(const HistogramSamples* snapshot,
210 void WriteAscii(std::string* output) const override; 210 std::string* output) const override;
211 void WriteAscii(const HistogramSamples* snapshot,
212 std::string* output) const override;
211 213
212 protected: 214 protected:
213 // This class, defined entirely within the .cc file, contains all the 215 // This class, defined entirely within the .cc file, contains all the
214 // common logic for building a Histogram and can be overridden by more 216 // 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 217 // 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 218 // defined as an embedded class (rather than an anonymous one) so it
217 // can access the protected constructors. 219 // can access the protected constructors.
218 class Factory; 220 class Factory;
219 221
220 // |ranges| should contain the underflow and overflow buckets. See top 222 // |ranges| should contain the underflow and overflow buckets. See top
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268 static HistogramBase* DeserializeInfoImpl(base::PickleIterator* iter); 270 static HistogramBase* DeserializeInfoImpl(base::PickleIterator* iter);
269 271
270 // Implementation of SnapshotSamples function. 272 // Implementation of SnapshotSamples function.
271 std::unique_ptr<SampleVector> SnapshotSampleVector() const; 273 std::unique_ptr<SampleVector> SnapshotSampleVector() const;
272 274
273 //---------------------------------------------------------------------------- 275 //----------------------------------------------------------------------------
274 // Helpers for emitting Ascii graphic. Each method appends data to output. 276 // Helpers for emitting Ascii graphic. Each method appends data to output.
275 277
276 void WriteAsciiImpl(bool graph_it, 278 void WriteAsciiImpl(bool graph_it,
277 const std::string& newline, 279 const std::string& newline,
280 const SampleVector* snapshot,
278 std::string* output) const; 281 std::string* output) const;
279 282
280 // Find out how large (graphically) the largest bucket will appear to be. 283 // Find out how large (graphically) the largest bucket will appear to be.
281 double GetPeakBucketSize(const SampleVector& samples) const; 284 double GetPeakBucketSize(const SampleVector& samples) const;
282 285
283 // Write a common header message describing this histogram. 286 // Write a common header message describing this histogram.
284 void WriteAsciiHeader(const SampleVector& samples, 287 void WriteAsciiHeader(const SampleVector& samples,
285 Count sample_count, 288 Count sample_count,
286 std::string* output) const; 289 std::string* output) const;
287 290
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538 static HistogramBase* DeserializeInfoImpl(base::PickleIterator* iter); 541 static HistogramBase* DeserializeInfoImpl(base::PickleIterator* iter);
539 542
540 static bool ValidateCustomRanges(const std::vector<Sample>& custom_ranges); 543 static bool ValidateCustomRanges(const std::vector<Sample>& custom_ranges);
541 544
542 DISALLOW_COPY_AND_ASSIGN(CustomHistogram); 545 DISALLOW_COPY_AND_ASSIGN(CustomHistogram);
543 }; 546 };
544 547
545 } // namespace base 548 } // namespace base
546 549
547 #endif // BASE_METRICS_HISTOGRAM_H_ 550 #endif // BASE_METRICS_HISTOGRAM_H_
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