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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/logging.h" | |
| 15 #include "base/memory/scoped_ptr.h" | |
| 16 #include "base/metrics/histogram_base.h" | |
| 17 #include "base/metrics/sample_map.h" | |
| 18 #include "base/synchronization/lock.h" | |
| 19 | |
| 20 namespace base { | |
| 21 | |
| 22 #define UMA_HISTOGRAM_SPARSE_SLOWLY(name, sample) \ | |
| 23 do { \ | |
| 24 base::HistogramBase* histogram = base::SparseHistogram::FactoryGet( \ | |
| 25 name, base::HistogramBase::kUmaTargetedHistogramFlag); \ | |
| 26 histogram->Add(sample); \ | |
| 27 } while (0) | |
| 28 | |
| 29 class HistogramSamples; | |
| 30 | |
| 31 class BASE_EXPORT_PRIVATE SparseHistogram : public HistogramBase { | |
| 32 public: | |
| 33 // If there's one with same name, return the existing one. If not, create a | |
| 34 // new one. | |
| 35 static HistogramBase* FactoryGet(const std::string& name, int32 flags); | |
| 36 | |
| 37 ~SparseHistogram() override; | |
| 38 | |
| 39 // HistogramBase implementation: | |
| 40 HistogramType GetHistogramType() const override; | |
| 41 bool HasConstructionArguments(Sample expected_minimum, | |
| 42 Sample expected_maximum, | |
| 43 size_t expected_bucket_count) const override; | |
| 44 void Add(Sample value) override; | |
| 45 void AddSamples(const HistogramSamples& samples) override; | |
| 46 bool AddSamplesFromPickle(base::PickleIterator* iter) override; | |
| 47 scoped_ptr<HistogramSamples> SnapshotSamples() const override; | |
| 48 void WriteHTMLGraph(std::string* output) const override; | |
| 49 void WriteAscii(std::string* output) const override; | |
| 50 | |
| 51 protected: | |
| 52 // HistogramBase implementation: | |
| 53 bool SerializeInfoImpl(base::Pickle* pickle) const override; | |
| 54 | |
| 55 private: | |
| 56 // Clients should always use FactoryGet to create SparseHistogram. | |
| 57 explicit SparseHistogram(const std::string& name); | |
| 58 | |
| 59 friend BASE_EXPORT_PRIVATE HistogramBase* DeserializeHistogramInfo( | |
| 60 base::PickleIterator* iter); | |
| 61 static HistogramBase* DeserializeInfoImpl(base::PickleIterator* iter); | |
| 62 | |
| 63 void GetParameters(DictionaryValue* params) const override; | |
| 64 void GetCountAndBucketData(Count* count, | |
| 65 int64* sum, | |
| 66 ListValue* buckets) const override; | |
| 67 | |
| 68 // Helpers for emitting Ascii graphic. Each method appends data to output. | |
| 69 void WriteAsciiImpl(bool graph_it, | |
| 70 const std::string& newline, | |
| 71 std::string* output) const; | |
| 72 | |
| 73 // Write a common header message describing this histogram. | |
| 74 void WriteAsciiHeader(const Count total_count, | |
| 75 std::string* output) const; | |
| 76 | |
| 77 // For constuctor calling. | |
| 78 friend class SparseHistogramTest; | |
| 79 | |
| 80 // Protects access to |samples_|. | |
| 81 mutable base::Lock lock_; | |
| 82 | |
| 83 SampleMap samples_; | |
| 84 | |
| 85 DISALLOW_COPY_AND_ASSIGN(SparseHistogram); | |
| 86 }; | |
| 87 | |
| 88 } // namespace base | |
| 89 | |
| 90 #endif // BASE_METRICS_SPARSE_HISTOGRAM_H_ | |
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