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Side by Side Diff: base/metrics/histogram_base.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 #ifndef BASE_METRICS_HISTOGRAM_BASE_H_ 5 #ifndef BASE_METRICS_HISTOGRAM_BASE_H_
6 #define BASE_METRICS_HISTOGRAM_BASE_H_ 6 #define BASE_METRICS_HISTOGRAM_BASE_H_
7 7
8 #include <limits.h> 8 #include <limits.h>
9 #include <stddef.h> 9 #include <stddef.h>
10 #include <stdint.h> 10 #include <stdint.h>
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195 195
196 // Snapshot the current complete set of sample data. 196 // Snapshot the current complete set of sample data.
197 // Override with atomic/locked snapshot if needed. 197 // Override with atomic/locked snapshot if needed.
198 virtual std::unique_ptr<HistogramSamples> SnapshotSamples() const = 0; 198 virtual std::unique_ptr<HistogramSamples> SnapshotSamples() const = 0;
199 199
200 // Calculate the change (delta) in histogram counts since the previous call 200 // Calculate the change (delta) in histogram counts since the previous call
201 // to this method. Each successive call will return only those counts 201 // to this method. Each successive call will return only those counts
202 // changed since the last call. 202 // changed since the last call.
203 virtual std::unique_ptr<HistogramSamples> SnapshotDelta() = 0; 203 virtual std::unique_ptr<HistogramSamples> SnapshotDelta() = 0;
204 204
205 // The following methods provide graphical histogram displays. 205 // The following methods provide graphical histogram displays. The snapshot
206 virtual void WriteHTMLGraph(std::string* output) const = 0; 206 // must be for this histogram or the results are undefined. If the passed
207 virtual void WriteAscii(std::string* output) const = 0; 207 // |snapshot| is null, one will be taken of the internal data.
208 virtual void WriteHTMLGraph(const HistogramSamples* snapshot,
209 std::string* output) const = 0;
210 virtual void WriteAscii(const HistogramSamples* snapshot,
211 std::string* output) const = 0;
208 212
209 // Produce a JSON representation of the histogram. This is implemented with 213 // Produce a JSON representation of the histogram. This is implemented with
210 // the help of GetParameters and GetCountAndBucketData; overwrite them to 214 // the help of GetParameters and GetCountAndBucketData; overwrite them to
211 // customize the output. 215 // customize the output.
212 void WriteJSON(std::string* output) const; 216 void WriteJSON(std::string* output) const;
213 217
214 // This enables a histogram that reports the what types of histograms are 218 // This enables a histogram that reports the what types of histograms are
215 // created and their flags. It must be called while still single-threaded. 219 // created and their flags. It must be called while still single-threaded.
216 // 220 //
217 // IMPORTANT: Callers must update tools/metrics/histograms/histograms.xml 221 // IMPORTANT: Callers must update tools/metrics/histograms/histograms.xml
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265 269
266 const std::string histogram_name_; 270 const std::string histogram_name_;
267 AtomicCount flags_; 271 AtomicCount flags_;
268 272
269 DISALLOW_COPY_AND_ASSIGN(HistogramBase); 273 DISALLOW_COPY_AND_ASSIGN(HistogramBase);
270 }; 274 };
271 275
272 } // namespace base 276 } // namespace base
273 277
274 #endif // BASE_METRICS_HISTOGRAM_BASE_H_ 278 #endif // BASE_METRICS_HISTOGRAM_BASE_H_
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