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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 // SampleVector implements HistogramSamples interface. It is used by all | |
| 6 // Histogram based classes to store samples. | |
| 7 | |
| 8 #ifndef BASE_METRICS_SAMPLE_VECTOR_H_ | |
| 9 #define BASE_METRICS_SAMPLE_VECTOR_H_ | |
| 10 | |
| 11 #include <vector> | |
| 12 | |
| 13 #include "base/compiler_specific.h" | |
| 14 #include "base/gtest_prod_util.h" | |
| 15 #include "base/memory/scoped_ptr.h" | |
| 16 #include "base/metrics/histogram_base.h" | |
| 17 #include "base/metrics/histogram_samples.h" | |
| 18 | |
| 19 namespace base { | |
| 20 | |
| 21 class BucketRanges; | |
| 22 | |
| 23 class BASE_EXPORT_PRIVATE SampleVector : public HistogramSamples { | |
| 24 public: | |
| 25 explicit SampleVector(const BucketRanges* bucket_ranges); | |
| 26 ~SampleVector() override; | |
| 27 | |
| 28 // HistogramSamples implementation: | |
| 29 void Accumulate(HistogramBase::Sample value, | |
| 30 HistogramBase::Count count) override; | |
| 31 HistogramBase::Count GetCount(HistogramBase::Sample value) const override; | |
| 32 HistogramBase::Count TotalCount() const override; | |
| 33 scoped_ptr<SampleCountIterator> Iterator() const override; | |
| 34 | |
| 35 // Get count of a specific bucket. | |
| 36 HistogramBase::Count GetCountAtIndex(size_t bucket_index) const; | |
| 37 | |
| 38 protected: | |
| 39 bool AddSubtractImpl( | |
| 40 SampleCountIterator* iter, | |
| 41 HistogramSamples::Operator op) override; // |op| is ADD or SUBTRACT. | |
| 42 | |
| 43 virtual size_t GetBucketIndex(HistogramBase::Sample value) const; | |
| 44 | |
| 45 private: | |
| 46 FRIEND_TEST_ALL_PREFIXES(HistogramTest, CorruptSampleCounts); | |
| 47 | |
| 48 std::vector<HistogramBase::AtomicCount> counts_; | |
| 49 | |
| 50 // Shares the same BucketRanges with Histogram object. | |
| 51 const BucketRanges* const bucket_ranges_; | |
| 52 | |
| 53 DISALLOW_COPY_AND_ASSIGN(SampleVector); | |
| 54 }; | |
| 55 | |
| 56 class BASE_EXPORT_PRIVATE SampleVectorIterator : public SampleCountIterator { | |
| 57 public: | |
| 58 SampleVectorIterator(const std::vector<HistogramBase::AtomicCount>* counts, | |
| 59 const BucketRanges* bucket_ranges); | |
| 60 ~SampleVectorIterator() override; | |
| 61 | |
| 62 // SampleCountIterator implementation: | |
| 63 bool Done() const override; | |
| 64 void Next() override; | |
| 65 void Get(HistogramBase::Sample* min, | |
| 66 HistogramBase::Sample* max, | |
| 67 HistogramBase::Count* count) const override; | |
| 68 | |
| 69 // SampleVector uses predefined buckets, so iterator can return bucket index. | |
| 70 bool GetBucketIndex(size_t* index) const override; | |
| 71 | |
| 72 private: | |
| 73 void SkipEmptyBuckets(); | |
| 74 | |
| 75 const std::vector<HistogramBase::AtomicCount>* counts_; | |
| 76 const BucketRanges* bucket_ranges_; | |
| 77 | |
| 78 size_t index_; | |
| 79 }; | |
| 80 | |
| 81 } // namespace base | |
| 82 | |
| 83 #endif // BASE_METRICS_SAMPLE_VECTOR_H_ | |
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