SampleSet -> HistogramSamples (will be reused by SparseHistogram)

base/metrics/histogram_snapshot_manager.h

 // Copyright (c) 2012 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_SNAPSHOT_MANAGER_H_
 #define BASE_METRICS_HISTOGRAM_SNAPSHOT_MANAGER_H_
 
 #include <map>
 #include <string>
 
 #include "base/basictypes.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram.h"
-#include "base/metrics/histogram_flattener.h"
 
 namespace base {
 
+class HistogramSamples;
+class HistogramFlattener;
+
 // HistogramSnapshotManager handles the logistics of gathering up available
 // histograms for recording either to disk or for transmission (such as from
 // renderer to browser, or from browser to UMA upload). Since histograms can sit
 // in memory for an extended period of time, and are vulnerable to memory
 // corruption, this class also validates as much rendundancy as it can before
 // calling for the marginal change (a.k.a., delta) in a histogram to be
 // recorded.
 class BASE_EXPORT HistogramSnapshotManager {
  public:
   explicit HistogramSnapshotManager(HistogramFlattener* histogram_flattener);
   virtual ~HistogramSnapshotManager();
 
   // Snapshot all histograms, and ask |histogram_flattener_| to record the
   // delta. The arguments allow selecting only a subset of histograms for
   // recording, or to set a flag in each recorded histogram.
-  void PrepareDeltas(base::Histogram::Flags flags_to_set, bool record_only_uma);
+  void PrepareDeltas(Histogram::Flags flags_to_set, bool record_only_uma);
 
  private:
-  // Maintain a map of histogram names to the sample stats we've recorded.
-  typedef std::map<std::string, base::Histogram::SampleSet> LoggedSampleMap;
-  // List of histograms names, and their encontered corruptions.
-  typedef std::map<std::string, int> ProblemMap;
+  // Snapshot this histogram, and record the delta.
+  void PrepareDelta(const Histogram& histogram);
 
-  // Snapshot this histogram, and record the delta.
-  void PrepareDelta(const base::Histogram& histogram);
+  // Try to detect and fix count inconsistency of logged samples.
+  void InspectLoggedSamplesInconsistency(
+      const HistogramSamples& new_snapshot,
+      HistogramSamples* logged_samples);
 
   // For histograms, track what we've already recorded (as a sample for
   // each histogram) so that we can record only the delta with the next log.
-  LoggedSampleMap logged_samples_;
+  std::map<std::string, HistogramSamples*> logged_samples_;
 
-  // List of histograms found corrupt to be corrupt, and their problems.
-  scoped_ptr<ProblemMap> inconsistencies_;
+  // List of histograms found to be corrupt, and their problems.
+  std::map<std::string, int> inconsistencies_;
 
   // |histogram_flattener_| handles the logistics of recording the histogram
   // deltas.
   HistogramFlattener* histogram_flattener_;  // Weak.
 
   DISALLOW_COPY_AND_ASSIGN(HistogramSnapshotManager);
 };
 
 }  // namespace base
 
 #endif  // BASE_METRICS_HISTOGRAM_SNAPSHOT_MANAGER_H_