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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 // See header file for details and examples. | 8 // See header file for details and examples. |
9 | 9 |
10 #include "base/metrics/histogram.h" | 10 #include "base/metrics/histogram.h" |
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432 samples_->Accumulate(value, count); | 432 samples_->Accumulate(value, count); |
433 | 433 |
434 FindAndRunCallback(value); | 434 FindAndRunCallback(value); |
435 } | 435 } |
436 | 436 |
437 std::unique_ptr<HistogramSamples> Histogram::SnapshotSamples() const { | 437 std::unique_ptr<HistogramSamples> Histogram::SnapshotSamples() const { |
438 return SnapshotSampleVector(); | 438 return SnapshotSampleVector(); |
439 } | 439 } |
440 | 440 |
441 std::unique_ptr<HistogramSamples> Histogram::SnapshotDelta() { | 441 std::unique_ptr<HistogramSamples> Histogram::SnapshotDelta() { |
| 442 DCHECK(!final_delta_created_); |
| 443 |
442 std::unique_ptr<HistogramSamples> snapshot = SnapshotSampleVector(); | 444 std::unique_ptr<HistogramSamples> snapshot = SnapshotSampleVector(); |
443 if (!logged_samples_) { | 445 if (!logged_samples_) { |
444 // If nothing has been previously logged, save this one as | 446 // If nothing has been previously logged, save this one as |
445 // |logged_samples_| and gather another snapshot to return. | 447 // |logged_samples_| and gather another snapshot to return. |
446 logged_samples_.swap(snapshot); | 448 logged_samples_.swap(snapshot); |
447 return SnapshotSampleVector(); | 449 return SnapshotSampleVector(); |
448 } | 450 } |
449 | 451 |
450 // Subtract what was previously logged and update that information. | 452 // Subtract what was previously logged and update that information. |
451 snapshot->Subtract(*logged_samples_); | 453 snapshot->Subtract(*logged_samples_); |
452 logged_samples_->Add(*snapshot); | 454 logged_samples_->Add(*snapshot); |
453 return snapshot; | 455 return snapshot; |
454 } | 456 } |
455 | 457 |
| 458 std::unique_ptr<HistogramSamples> Histogram::SnapshotFinalDelta() const { |
| 459 DCHECK(!final_delta_created_); |
| 460 final_delta_created_ = true; |
| 461 |
| 462 std::unique_ptr<HistogramSamples> snapshot = SnapshotSampleVector(); |
| 463 |
| 464 // Subtract what was previously logged and then return. |
| 465 if (logged_samples_) |
| 466 snapshot->Subtract(*logged_samples_); |
| 467 return snapshot; |
| 468 } |
| 469 |
456 void Histogram::AddSamples(const HistogramSamples& samples) { | 470 void Histogram::AddSamples(const HistogramSamples& samples) { |
457 samples_->Add(samples); | 471 samples_->Add(samples); |
458 } | 472 } |
459 | 473 |
460 bool Histogram::AddSamplesFromPickle(PickleIterator* iter) { | 474 bool Histogram::AddSamplesFromPickle(PickleIterator* iter) { |
461 return samples_->AddFromPickle(iter); | 475 return samples_->AddFromPickle(iter); |
462 } | 476 } |
463 | 477 |
464 // The following methods provide a graphical histogram display. | 478 // The following methods provide a graphical histogram display. |
465 void Histogram::WriteHTMLGraph(std::string* output) const { | 479 void Histogram::WriteHTMLGraph(std::string* output) const { |
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1165 Sample sample = custom_ranges[i]; | 1179 Sample sample = custom_ranges[i]; |
1166 if (sample < 0 || sample > HistogramBase::kSampleType_MAX - 1) | 1180 if (sample < 0 || sample > HistogramBase::kSampleType_MAX - 1) |
1167 return false; | 1181 return false; |
1168 if (sample != 0) | 1182 if (sample != 0) |
1169 has_valid_range = true; | 1183 has_valid_range = true; |
1170 } | 1184 } |
1171 return has_valid_range; | 1185 return has_valid_range; |
1172 } | 1186 } |
1173 | 1187 |
1174 } // namespace base | 1188 } // namespace base |
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