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| 1 // Copyright 2013 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_HISTOGRAM_DELTA_SERIALIZATION_H_ |
| 6 #define BASE_METRICS_HISTOGRAM_DELTA_SERIALIZATION_H_ |
| 7 |
| 8 #include <string> |
| 9 #include <vector> |
| 10 |
| 11 #include "base/base_export.h" |
| 12 #include "base/basictypes.h" |
| 13 #include "base/memory/scoped_ptr.h" |
| 14 #include "base/metrics/histogram_flattener.h" |
| 15 #include "base/metrics/histogram_snapshot_manager.h" |
| 16 |
| 17 namespace base { |
| 18 |
| 19 class HistogramBase; |
| 20 |
| 21 // Serializes and restores histograms deltas. |
| 22 class BASE_EXPORT HistogramDeltaSerialization : public HistogramFlattener { |
| 23 public: |
| 24 // |caller_name| is string used in histograms for counting inconsistencies. |
| 25 explicit HistogramDeltaSerialization(const std::string& caller_name); |
| 26 virtual ~HistogramDeltaSerialization(); |
| 27 |
| 28 // Computes deltas in histogram bucket counts relative to the previous call to |
| 29 // this method. Stores the deltas in serialized form into |serialized_deltas|. |
| 30 // If |serialized_deltas| is NULL, no data is serialized, though the next call |
| 31 // will compute the deltas relative to this one. |
| 32 void PrepareAndSerializeDeltas(std::vector<std::string>* serialized_deltas); |
| 33 |
| 34 // Deserialize deltas and add samples to corresponding histograms, creating |
| 35 // them if necessary. Silently ignores errors in |serialized_deltas|. |
| 36 static void DeserializeAndAddSamples( |
| 37 const std::vector<std::string>& serialized_deltas); |
| 38 |
| 39 private: |
| 40 // HistogramFlattener implementation. |
| 41 virtual void RecordDelta(const HistogramBase& histogram, |
| 42 const HistogramSamples& snapshot) OVERRIDE; |
| 43 virtual void InconsistencyDetected( |
| 44 HistogramBase::Inconsistency problem) OVERRIDE; |
| 45 virtual void UniqueInconsistencyDetected( |
| 46 HistogramBase::Inconsistency problem) OVERRIDE; |
| 47 virtual void InconsistencyDetectedInLoggedCount(int amount) OVERRIDE; |
| 48 |
| 49 // Calculates deltas in histogram counters. |
| 50 HistogramSnapshotManager histogram_snapshot_manager_; |
| 51 |
| 52 // Output buffer for serialized deltas. |
| 53 std::vector<std::string>* serialized_deltas_; |
| 54 |
| 55 // Histograms to count inconsistencies in snapshots. |
| 56 HistogramBase* inconsistencies_histogram_; |
| 57 HistogramBase* inconsistencies_unique_histogram_; |
| 58 HistogramBase* inconsistent_snapshot_histogram_; |
| 59 |
| 60 DISALLOW_COPY_AND_ASSIGN(HistogramDeltaSerialization); |
| 61 }; |
| 62 |
| 63 } // namespace base |
| 64 |
| 65 #endif // BASE_METRICS_HISTOGRAM_DELTA_SERIALIZATION_H_ |
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