components/cronet/histogram_manager.h

   1 // Copyright 2014 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 COMPONENTS_CRONET_HISTOGRAM_MANAGER_H_
   6 #define COMPONENTS_CRONET_HISTOGRAM_MANAGER_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "base/basictypes.h"
  12 #include "base/lazy_instance.h"
  13 #include "base/macros.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/metrics/histogram_flattener.h"
  16 #include "base/metrics/histogram_snapshot_manager.h"
  17 #include "components/metrics/proto/chrome_user_metrics_extension.pb.h"
  18
  19 namespace cronet {
  20
  21 // A HistogramManager instance is created by the app. It is the central
  22 // controller for the acquisition of log data, and recording deltas for
  23 // transmission to an external server.
  24 class HistogramManager : public base::HistogramFlattener {
  25  public:
  26   HistogramManager();
  27   ~HistogramManager() override;
  28
  29   // Snapshot all histograms to record the delta into |uma_proto_| and then
  30   // returns the serialized protobuf representation of the record in |data|.
  31   // Returns true if it was successfully serialized.
  32   bool GetDeltas(std::vector<uint8>* data);
  33
  34   // TODO(mef): Hang Histogram Manager off java object instead of singleton.
  35   static HistogramManager* GetInstance();
  36
  37  private:
  38   friend struct base::DefaultLazyInstanceTraits<HistogramManager>;
  39
  40   // base::HistogramFlattener:
  41   void RecordDelta(const base::HistogramBase& histogram,
  42                    const base::HistogramSamples& snapshot) override;
  43   void InconsistencyDetected(
  44       base::HistogramBase::Inconsistency problem) override;
  45   void UniqueInconsistencyDetected(
  46       base::HistogramBase::Inconsistency problem) override;
  47   void InconsistencyDetectedInLoggedCount(int amount) override;
  48
  49   base::HistogramSnapshotManager histogram_snapshot_manager_;
  50
  51   // Stores the protocol buffer representation for this log.
  52   metrics::ChromeUserMetricsExtension uma_proto_;
  53
  54   DISALLOW_COPY_AND_ASSIGN(HistogramManager);
  55 };
  56
  57 }  // namespace cronet
  58
  59 #endif  // COMPONENTS_CRONET_HISTOGRAM_MANAGER_H_