85 lines
2.6 KiB
C
85 lines
2.6 KiB
C
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// SampleVector implements HistogramSamples interface. It is used by all
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// Histogram based classes to store samples.
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#ifndef BASE_METRICS_SAMPLE_VECTOR_H_
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#define BASE_METRICS_SAMPLE_VECTOR_H_
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#include <vector>
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#include "base/compiler_specific.h"
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#include "base/gtest_prod_util.h"
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#include "base/memory/scoped_ptr.h"
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#include "base/metrics/histogram_base.h"
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#include "base/metrics/histogram_samples.h"
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namespace base {
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class BucketRanges;
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class BASE_EXPORT_PRIVATE SampleVector : public HistogramSamples {
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public:
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explicit SampleVector(const BucketRanges* bucket_ranges);
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virtual ~SampleVector();
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// HistogramSamples implementation:
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virtual void Accumulate(HistogramBase::Sample value,
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HistogramBase::Count count) OVERRIDE;
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virtual HistogramBase::Count GetCount(
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HistogramBase::Sample value) const OVERRIDE;
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virtual HistogramBase::Count TotalCount() const OVERRIDE;
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virtual scoped_ptr<SampleCountIterator> Iterator() const OVERRIDE;
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// Get count of a specific bucket.
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HistogramBase::Count GetCountAtIndex(size_t bucket_index) const;
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protected:
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virtual bool AddSubtractImpl(
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SampleCountIterator* iter,
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HistogramSamples::Operator op) OVERRIDE; // |op| is ADD or SUBTRACT.
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virtual size_t GetBucketIndex(HistogramBase::Sample value) const;
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private:
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FRIEND_TEST_ALL_PREFIXES(HistogramTest, CorruptSampleCounts);
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std::vector<HistogramBase::Count> counts_;
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// Shares the same BucketRanges with Histogram object.
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const BucketRanges* const bucket_ranges_;
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DISALLOW_COPY_AND_ASSIGN(SampleVector);
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};
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class BASE_EXPORT_PRIVATE SampleVectorIterator : public SampleCountIterator {
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public:
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SampleVectorIterator(const std::vector<HistogramBase::Count>* counts,
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const BucketRanges* bucket_ranges);
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virtual ~SampleVectorIterator();
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// SampleCountIterator implementation:
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virtual bool Done() const OVERRIDE;
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virtual void Next() OVERRIDE;
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virtual void Get(HistogramBase::Sample* min,
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HistogramBase::Sample* max,
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HistogramBase::Count* count) const OVERRIDE;
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// SampleVector uses predefined buckets, so iterator can return bucket index.
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virtual bool GetBucketIndex(size_t* index) const OVERRIDE;
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private:
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void SkipEmptyBuckets();
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const std::vector<HistogramBase::Count>* counts_;
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const BucketRanges* bucket_ranges_;
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size_t index_;
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};
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} // namespace base
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#endif // BASE_METRICS_SAMPLE_VECTOR_H_
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