net/disk_cache/blockfile/stats_histogram.cc - Issue 295913014: Disk cache: Remove stats_histogram.

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Issue 295913014: Disk cache: Remove stats_histogram. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src

Patch Set: Fix typo Created 6 years, 7 months ago

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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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