Index: base/metrics/histogram_delta_serialization.h |
diff --git a/base/metrics/histogram_delta_serialization.h b/base/metrics/histogram_delta_serialization.h |
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+++ b/base/metrics/histogram_delta_serialization.h |
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+// Copyright 2013 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. |
+ |
+#ifndef BASE_METRICS_HISTOGRAM_DELTA_SERIALIZATION_H_ |
+#define BASE_METRICS_HISTOGRAM_DELTA_SERIALIZATION_H_ |
+ |
+#include <string> |
+#include <vector> |
+ |
+#include "base/base_export.h" |
+#include "base/basictypes.h" |
+#include "base/memory/scoped_ptr.h" |
+#include "base/metrics/histogram_flattener.h" |
+#include "base/metrics/histogram_snapshot_manager.h" |
+ |
+namespace base { |
+ |
+class HistogramBase; |
+ |
+// Serializes and restores histograms deltas. |
+class BASE_EXPORT HistogramDeltaSerialization : public HistogramFlattener { |
+ public: |
+ // |caller_name| is string used in histograms for counting inconsistencies. |
+ explicit HistogramDeltaSerialization(const std::string& caller_name); |
+ virtual ~HistogramDeltaSerialization(); |
+ |
+ // Computes deltas in histogram bucket counts relative to the previous call to |
+ // this method. Stores the deltas in serialized form into |serialized_deltas|. |
+ // If |serialized_deltas| is NULL, no data is serialized, though the next call |
+ // will compute the deltas relative to this one. |
+ void PrepareAndSerializeDeltas(std::vector<std::string>* serialized_deltas); |
+ |
+ // Deserialize deltas and add samples to corresponding histograms, creating |
+ // them if necessary. Silently ignores errors in |serialized_deltas|. |
+ static void DeserializeAndAddSamples( |
+ const std::vector<std::string>& serialized_deltas); |
+ |
+ private: |
+ // HistogramFlattener implementation. |
+ virtual void RecordDelta(const HistogramBase& histogram, |
+ const HistogramSamples& snapshot) OVERRIDE; |
+ virtual void InconsistencyDetected( |
+ HistogramBase::Inconsistency problem) OVERRIDE; |
+ virtual void UniqueInconsistencyDetected( |
+ HistogramBase::Inconsistency problem) OVERRIDE; |
+ virtual void InconsistencyDetectedInLoggedCount(int amount) OVERRIDE; |
+ |
+ // Calculates deltas in histogram counters. |
+ HistogramSnapshotManager histogram_snapshot_manager_; |
+ |
+ // Output buffer for serialized deltas. |
+ std::vector<std::string>* serialized_deltas_; |
+ |
+ // Histograms to count inconsistencies in snapshots. |
+ HistogramBase* inconsistencies_histogram_; |
+ HistogramBase* inconsistencies_unique_histogram_; |
+ HistogramBase* inconsistent_snapshot_histogram_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(HistogramDeltaSerialization); |
+}; |
+ |
+} // namespace base |
+ |
+#endif // BASE_METRICS_HISTOGRAM_DELTA_SERIALIZATION_H_ |