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| 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 | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "net/disk_cache/blockfile/stats_histogram.h" | |
| 6 | |
| 7 #include "base/debug/leak_annotations.h" | |
| 8 #include "base/logging.h" | |
| 9 #include "base/metrics/bucket_ranges.h" | |
| 10 #include "base/metrics/histogram_base.h" | |
| 11 #include "base/metrics/sample_vector.h" | |
| 12 #include "base/metrics/statistics_recorder.h" | |
| 13 #include "net/disk_cache/blockfile/stats.h" | |
| 14 | |
| 15 namespace disk_cache { | |
| 16 | |
| 17 using base::BucketRanges; | |
| 18 using base::Histogram; | |
| 19 using base::HistogramSamples; | |
| 20 using base::SampleVector; | |
| 21 using base::StatisticsRecorder; | |
| 22 | |
| 23 StatsHistogram::StatsHistogram(const std::string& name, | |
| 24 Sample minimum, | |
| 25 Sample maximum, | |
| 26 const BucketRanges* ranges, | |
| 27 const Stats* stats) | |
| 28 : Histogram(name, minimum, maximum, ranges), | |
| 29 stats_(stats) {} | |
| 30 | |
| 31 StatsHistogram::~StatsHistogram() {} | |
| 32 | |
| 33 // static | |
| 34 void StatsHistogram::InitializeBucketRanges(const Stats* stats, | |
| 35 BucketRanges* ranges) { | |
| 36 for (size_t i = 0; i < ranges->size(); ++i) { | |
| 37 ranges->set_range(i, stats->GetBucketRange(i)); | |
| 38 } | |
| 39 ranges->ResetChecksum(); | |
| 40 } | |
| 41 | |
| 42 StatsHistogram* StatsHistogram::FactoryGet(const std::string& name, | |
| 43 const Stats* stats) { | |
| 44 Sample minimum = 1; | |
| 45 Sample maximum = disk_cache::Stats::kDataSizesLength - 1; | |
| 46 size_t bucket_count = disk_cache::Stats::kDataSizesLength; | |
| 47 HistogramBase* histogram = StatisticsRecorder::FindHistogram(name); | |
| 48 if (!histogram) { | |
| 49 DCHECK(stats); | |
| 50 | |
| 51 // To avoid racy destruction at shutdown, the following will be leaked. | |
| 52 BucketRanges* ranges = new BucketRanges(bucket_count + 1); | |
| 53 InitializeBucketRanges(stats, ranges); | |
| 54 const BucketRanges* registered_ranges = | |
| 55 StatisticsRecorder::RegisterOrDeleteDuplicateRanges(ranges); | |
| 56 | |
| 57 // To avoid racy destruction at shutdown, the following will be leaked. | |
| 58 StatsHistogram* stats_histogram = | |
| 59 new StatsHistogram(name, minimum, maximum, registered_ranges, stats); | |
| 60 stats_histogram->SetFlags(kUmaTargetedHistogramFlag); | |
| 61 histogram = StatisticsRecorder::RegisterOrDeleteDuplicate(stats_histogram); | |
| 62 } | |
| 63 | |
| 64 DCHECK(base::HISTOGRAM == histogram->GetHistogramType()); | |
| 65 DCHECK(histogram->HasConstructionArguments(minimum, maximum, bucket_count)); | |
| 66 | |
| 67 // We're preparing for an otherwise unsafe upcast by ensuring we have the | |
| 68 // proper class type. | |
| 69 StatsHistogram* return_histogram = static_cast<StatsHistogram*>(histogram); | |
| 70 return return_histogram; | |
| 71 } | |
| 72 | |
| 73 void StatsHistogram::Disable() { | |
| 74 stats_ = NULL; | |
| 75 } | |
| 76 | |
| 77 scoped_ptr<HistogramSamples> StatsHistogram::SnapshotSamples() const { | |
| 78 scoped_ptr<SampleVector> samples(new SampleVector(bucket_ranges())); | |
| 79 if (stats_) | |
| 80 stats_->Snapshot(samples.get()); | |
| 81 | |
| 82 // Only report UMA data once. | |
| 83 StatsHistogram* mutable_me = const_cast<StatsHistogram*>(this); | |
| 84 mutable_me->ClearFlags(kUmaTargetedHistogramFlag); | |
| 85 | |
| 86 return samples.PassAs<HistogramSamples>(); | |
| 87 } | |
| 88 | |
| 89 int StatsHistogram::FindCorruption(const HistogramSamples& samples) const { | |
| 90 // This class won't monitor inconsistencies. | |
| 91 return HistogramBase::NO_INCONSISTENCIES; | |
| 92 } | |
| 93 | |
| 94 } // namespace disk_cache | |
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Chromium Code Reviews
Issue 295913014:
Disk cache: Remove stats_histogram. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src