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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// SampleMap implements HistogramSamples interface. It is used by the
// SparseHistogram class to store samples.
#ifndef BASE_METRICS_SAMPLE_MAP_H_
#define BASE_METRICS_SAMPLE_MAP_H_
#include <stdint.h>
#include <map>
#include <memory>
#include "base/base_export.h"
#include "base/metrics/histogram_base.h"
#include "base/metrics/histogram_samples.h"
namespace base {
// The logic here is similar to that of PersistentSampleMap but with different
// data structures. Changes here likely need to be duplicated there.
class BASE_EXPORT SampleMap : public HistogramSamples {
public:
using SampleToCountMap =
std::map<HistogramBase::Sample32, HistogramBase::Count32>;
explicit SampleMap(uint64_t id = 0);
SampleMap(const SampleMap&) = delete;
SampleMap& operator=(const SampleMap&) = delete;
~SampleMap() override;
// HistogramSamples:
void Accumulate(HistogramBase::Sample32 value,
HistogramBase::Count32 count) override;
HistogramBase::Count32 GetCount(HistogramBase::Sample32 value) const override;
HistogramBase::Count32 TotalCount() const override;
std::unique_ptr<SampleCountIterator> Iterator() const override;
std::unique_ptr<SampleCountIterator> ExtractingIterator() override;
bool IsDefinitelyEmpty() const override;
protected:
// Performs arithmetic. |op| is ADD or SUBTRACT.
bool AddSubtractImpl(SampleCountIterator* iter, Operator op) override;
private:
SampleToCountMap sample_counts_;
};
} // namespace base
#endif // BASE_METRICS_SAMPLE_MAP_H_
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