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Issue 120753002: Add a StatisticsDeltaReader class and use cases (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Address isherman's feedback (and bump copyright year). Created 6 years, 11 months ago
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1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "base/test/statistics_delta_reader.h"
6
7 #include "base/metrics/histogram.h"
8 #include "base/metrics/statistics_recorder.h"
9 #include "base/stl_util.h"
10
11 namespace base {
12
13 StatisticsDeltaReader::StatisticsDeltaReader() {
14 // Record any histogram data that exists when the object is created so it can
15 // be subtracted later.
16 StatisticsRecorder::Histograms histograms;
17 StatisticsRecorder::GetSnapshot(std::string(), &histograms);
18 for (size_t i = 0; i < histograms.size(); ++i) {
19 original_samples_[histograms[i]->histogram_name()] =
20 histograms[i]->SnapshotSamples().release();
21 }
22 }
23
24 StatisticsDeltaReader::~StatisticsDeltaReader() {
25 STLDeleteValues(&original_samples_);
26 }
27
28 scoped_ptr<HistogramSamples>
29 StatisticsDeltaReader::GetHistogramSamplesSinceCreation(
30 const std::string& histogram_name) {
31 HistogramBase* histogram = StatisticsRecorder::FindHistogram(histogram_name);
32 if (!histogram)
33 return scoped_ptr<HistogramSamples>();
34 scoped_ptr<HistogramSamples> named_samples(histogram->SnapshotSamples());
35 HistogramSamples* named_original_samples = original_samples_[histogram_name];
36 if (named_original_samples)
37 named_samples->Subtract(*named_original_samples);
38 return named_samples.Pass();
39 }
40
41 } // namespace base
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