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| 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 #ifndef BASE_METRICS_SPARSE_HISTOGRAM_H_ |
| 6 #define BASE_METRICS_SPARSE_HISTOGRAM_H_ |
| 7 |
| 8 #include <map> |
| 9 #include <string> |
| 10 |
| 11 #include "base/base_export.h" |
| 12 #include "base/basictypes.h" |
| 13 #include "base/compiler_specific.h" |
| 14 #include "base/metrics/histogram_base.h" |
| 15 #include "base/synchronization/lock.h" |
| 16 |
| 17 namespace base { |
| 18 |
| 19 class BASE_EXPORT_PRIVATE SparseHistogram : public HistogramBase { |
| 20 public: |
| 21 // If there's one with same name, return the existing one. If not, create a |
| 22 // new one. |
| 23 static HistogramBase* FactoryGet(const std::string& name, int32 flags); |
| 24 |
| 25 virtual ~SparseHistogram(); |
| 26 |
| 27 virtual void Add(Sample value) OVERRIDE; |
| 28 |
| 29 virtual void SnapshotSample(std::map<Sample, Count>* sample) const; |
| 30 virtual void WriteHTMLGraph(std::string* output) const OVERRIDE; |
| 31 virtual void WriteAscii(std::string* output) const OVERRIDE; |
| 32 |
| 33 protected: |
| 34 // Clients should always use FactoryGet to create SparseHistogram. |
| 35 SparseHistogram(const std::string& name); |
| 36 |
| 37 private: |
| 38 friend class SparseHistogramTest; // For constuctor calling. |
| 39 |
| 40 std::map<Sample, Count> samples_; |
| 41 |
| 42 // Protects access to above map. |
| 43 mutable base::Lock lock_; |
| 44 |
| 45 DISALLOW_COPY_AND_ASSIGN(SparseHistogram); |
| 46 }; |
| 47 |
| 48 } // namespace base |
| 49 |
| 50 #endif // BASE_METRICS_SPARSE_HISTOGRAM_H_ |
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