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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef BASE_METRICS_SPARSE_HISTOGRAM_H_ | 5 #ifndef BASE_METRICS_SPARSE_HISTOGRAM_H_ |
6 #define BASE_METRICS_SPARSE_HISTOGRAM_H_ | 6 #define BASE_METRICS_SPARSE_HISTOGRAM_H_ |
7 | 7 |
8 #include <stddef.h> | 8 #include <stddef.h> |
9 #include <stdint.h> | 9 #include <stdint.h> |
10 | 10 |
11 #include <map> | 11 #include <map> |
| 12 #include <memory> |
12 #include <string> | 13 #include <string> |
13 | 14 |
14 #include "base/base_export.h" | 15 #include "base/base_export.h" |
15 #include "base/compiler_specific.h" | 16 #include "base/compiler_specific.h" |
16 #include "base/logging.h" | 17 #include "base/logging.h" |
17 #include "base/macros.h" | 18 #include "base/macros.h" |
18 #include "base/memory/scoped_ptr.h" | |
19 #include "base/metrics/histogram_base.h" | 19 #include "base/metrics/histogram_base.h" |
20 #include "base/metrics/sample_map.h" | 20 #include "base/metrics/sample_map.h" |
21 #include "base/synchronization/lock.h" | 21 #include "base/synchronization/lock.h" |
22 | 22 |
23 namespace base { | 23 namespace base { |
24 | 24 |
25 // Sparse histograms are well suited for recording counts of exact sample values | 25 // Sparse histograms are well suited for recording counts of exact sample values |
26 // that are sparsely distributed over a large range. | 26 // that are sparsely distributed over a large range. |
27 // | 27 // |
28 // The implementation uses a lock and a map, whereas other histogram types use a | 28 // The implementation uses a lock and a map, whereas other histogram types use a |
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53 class HistogramSamples; | 53 class HistogramSamples; |
54 class PersistentMemoryAllocator; | 54 class PersistentMemoryAllocator; |
55 | 55 |
56 class BASE_EXPORT SparseHistogram : public HistogramBase { | 56 class BASE_EXPORT SparseHistogram : public HistogramBase { |
57 public: | 57 public: |
58 // If there's one with same name, return the existing one. If not, create a | 58 // If there's one with same name, return the existing one. If not, create a |
59 // new one. | 59 // new one. |
60 static HistogramBase* FactoryGet(const std::string& name, int32_t flags); | 60 static HistogramBase* FactoryGet(const std::string& name, int32_t flags); |
61 | 61 |
62 // Create a histogram using data in persistent storage. | 62 // Create a histogram using data in persistent storage. |
63 static scoped_ptr<HistogramBase> PersistentCreate( | 63 static std::unique_ptr<HistogramBase> PersistentCreate( |
64 PersistentMemoryAllocator* allocator, | 64 PersistentMemoryAllocator* allocator, |
65 const std::string& name, | 65 const std::string& name, |
66 HistogramSamples::Metadata* meta, | 66 HistogramSamples::Metadata* meta, |
67 HistogramSamples::Metadata* logged_meta); | 67 HistogramSamples::Metadata* logged_meta); |
68 | 68 |
69 ~SparseHistogram() override; | 69 ~SparseHistogram() override; |
70 | 70 |
71 // HistogramBase implementation: | 71 // HistogramBase implementation: |
72 uint64_t name_hash() const override; | 72 uint64_t name_hash() const override; |
73 HistogramType GetHistogramType() const override; | 73 HistogramType GetHistogramType() const override; |
74 bool HasConstructionArguments(Sample expected_minimum, | 74 bool HasConstructionArguments(Sample expected_minimum, |
75 Sample expected_maximum, | 75 Sample expected_maximum, |
76 uint32_t expected_bucket_count) const override; | 76 uint32_t expected_bucket_count) const override; |
77 void Add(Sample value) override; | 77 void Add(Sample value) override; |
78 void AddCount(Sample value, int count) override; | 78 void AddCount(Sample value, int count) override; |
79 void AddSamples(const HistogramSamples& samples) override; | 79 void AddSamples(const HistogramSamples& samples) override; |
80 bool AddSamplesFromPickle(base::PickleIterator* iter) override; | 80 bool AddSamplesFromPickle(base::PickleIterator* iter) override; |
81 scoped_ptr<HistogramSamples> SnapshotSamples() const override; | 81 std::unique_ptr<HistogramSamples> SnapshotSamples() const override; |
82 scoped_ptr<HistogramSamples> SnapshotDelta() override; | 82 std::unique_ptr<HistogramSamples> SnapshotDelta() override; |
83 void WriteHTMLGraph(std::string* output) const override; | 83 void WriteHTMLGraph(std::string* output) const override; |
84 void WriteAscii(std::string* output) const override; | 84 void WriteAscii(std::string* output) const override; |
85 | 85 |
86 protected: | 86 protected: |
87 // HistogramBase implementation: | 87 // HistogramBase implementation: |
88 bool SerializeInfoImpl(base::Pickle* pickle) const override; | 88 bool SerializeInfoImpl(base::Pickle* pickle) const override; |
89 | 89 |
90 private: | 90 private: |
91 // Clients should always use FactoryGet to create SparseHistogram. | 91 // Clients should always use FactoryGet to create SparseHistogram. |
92 explicit SparseHistogram(const std::string& name); | 92 explicit SparseHistogram(const std::string& name); |
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113 // Write a common header message describing this histogram. | 113 // Write a common header message describing this histogram. |
114 void WriteAsciiHeader(const Count total_count, | 114 void WriteAsciiHeader(const Count total_count, |
115 std::string* output) const; | 115 std::string* output) const; |
116 | 116 |
117 // For constuctor calling. | 117 // For constuctor calling. |
118 friend class SparseHistogramTest; | 118 friend class SparseHistogramTest; |
119 | 119 |
120 // Protects access to |samples_|. | 120 // Protects access to |samples_|. |
121 mutable base::Lock lock_; | 121 mutable base::Lock lock_; |
122 | 122 |
123 scoped_ptr<HistogramSamples> samples_; | 123 std::unique_ptr<HistogramSamples> samples_; |
124 scoped_ptr<HistogramSamples> logged_samples_; | 124 std::unique_ptr<HistogramSamples> logged_samples_; |
125 | 125 |
126 DISALLOW_COPY_AND_ASSIGN(SparseHistogram); | 126 DISALLOW_COPY_AND_ASSIGN(SparseHistogram); |
127 }; | 127 }; |
128 | 128 |
129 } // namespace base | 129 } // namespace base |
130 | 130 |
131 #endif // BASE_METRICS_SPARSE_HISTOGRAM_H_ | 131 #endif // BASE_METRICS_SPARSE_HISTOGRAM_H_ |
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