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 virtual ~SampleVector(); 27 28 // HistogramSamples implementation: 29 virtual void Accumulate(HistogramBase::Sample value, 30 HistogramBase::Count count) OVERRIDE; 31 virtual HistogramBase::Count GetCount( 32 HistogramBase::Sample value) const OVERRIDE; 33 virtual HistogramBase::Count TotalCount() const OVERRIDE; 34 virtual scoped_ptr<SampleCountIterator> Iterator() const OVERRIDE; 35 36 // Get count of a specific bucket. 37 HistogramBase::Count GetCountAtIndex(size_t bucket_index) const; 38 39 protected: 40 virtual bool AddSubtractImpl( 41 SampleCountIterator* iter, 42 HistogramSamples::Operator op) OVERRIDE; // |op| is ADD or SUBTRACT. 43 44 virtual size_t GetBucketIndex(HistogramBase::Sample value) const; 45 46 private: 47 FRIEND_TEST_ALL_PREFIXES(HistogramTest, CorruptSampleCounts); 48 49 std::vector<HistogramBase::AtomicCount> counts_; 50 51 // Shares the same BucketRanges with Histogram object. 52 const BucketRanges* const bucket_ranges_; 53 54 DISALLOW_COPY_AND_ASSIGN(SampleVector); 55 }; 56 57 class BASE_EXPORT_PRIVATE SampleVectorIterator : public SampleCountIterator { 58 public: 59 SampleVectorIterator(const std::vector<HistogramBase::AtomicCount>* counts, 60 const BucketRanges* bucket_ranges); 61 virtual ~SampleVectorIterator(); 62 63 // SampleCountIterator implementation: 64 virtual bool Done() const OVERRIDE; 65 virtual void Next() OVERRIDE; 66 virtual void Get(HistogramBase::Sample* min, 67 HistogramBase::Sample* max, 68 HistogramBase::Count* count) const OVERRIDE; 69 70 // SampleVector uses predefined buckets, so iterator can return bucket index. 71 virtual bool GetBucketIndex(size_t* index) const OVERRIDE; 72 73 private: 74 void SkipEmptyBuckets(); 75 76 const std::vector<HistogramBase::AtomicCount>* counts_; 77 const BucketRanges* bucket_ranges_; 78 79 size_t index_; 80 }; 81 82 } // namespace base 83 84 #endif // BASE_METRICS_SAMPLE_VECTOR_H_ 85
