| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // 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/compiler_specific.h" |
| #include "base/macros.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: |
| SampleMap(); |
| explicit SampleMap(uint64_t id); |
| ~SampleMap() override; |
| |
| // HistogramSamples: |
| void Accumulate(HistogramBase::Sample value, |
| HistogramBase::Count count) override; |
| HistogramBase::Count GetCount(HistogramBase::Sample value) const override; |
| HistogramBase::Count TotalCount() const override; |
| std::unique_ptr<SampleCountIterator> Iterator() const override; |
| |
| protected: |
| // Performs arithemetic. |op| is ADD or SUBTRACT. |
| bool AddSubtractImpl(SampleCountIterator* iter, Operator op) override; |
| |
| private: |
| std::map<HistogramBase::Sample, HistogramBase::Count> sample_counts_; |
| |
| DISALLOW_COPY_AND_ASSIGN(SampleMap); |
| }; |
| |
| } // namespace base |
| |
| #endif // BASE_METRICS_SAMPLE_MAP_H_ |