105 lines
3.3 KiB
C++
105 lines
3.3 KiB
C++
// 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 <stddef.h>
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#include <stdint.h>
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#include <memory>
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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/macros.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 SampleVector : public HistogramSamples {
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public:
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explicit SampleVector(const BucketRanges* bucket_ranges);
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SampleVector(uint64_t id, const BucketRanges* bucket_ranges);
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SampleVector(uint64_t id,
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HistogramBase::AtomicCount* counts,
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size_t counts_size,
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Metadata* meta,
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const BucketRanges* bucket_ranges);
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~SampleVector() override;
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// HistogramSamples implementation:
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void Accumulate(HistogramBase::Sample value,
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HistogramBase::Count count) override;
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HistogramBase::Count GetCount(HistogramBase::Sample value) const override;
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HistogramBase::Count TotalCount() const override;
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std::unique_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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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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FRIEND_TEST_ALL_PREFIXES(SharedHistogramTest, CorruptSampleCounts);
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// In the case where this class manages the memory, here it is.
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std::vector<HistogramBase::AtomicCount> local_counts_;
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// These are raw pointers rather than objects for flexibility. The actual
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// memory is either managed by local_counts_ above or by an external object
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// and passed in directly.
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HistogramBase::AtomicCount* counts_;
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size_t counts_size_;
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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 SampleVectorIterator : public SampleCountIterator {
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public:
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SampleVectorIterator(const std::vector<HistogramBase::AtomicCount>* counts,
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const BucketRanges* bucket_ranges);
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SampleVectorIterator(const HistogramBase::AtomicCount* counts,
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size_t counts_size,
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const BucketRanges* bucket_ranges);
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~SampleVectorIterator() override;
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// SampleCountIterator implementation:
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bool Done() const override;
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void Next() override;
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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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bool GetBucketIndex(size_t* index) const override;
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private:
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void SkipEmptyBuckets();
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const HistogramBase::AtomicCount* counts_;
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size_t counts_size_;
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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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