components/cronet/histogram_manager.cc

   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 #include "components/cronet/histogram_manager.h"
   6
   7 #include <string>
   8 #include <vector>
   9
  10 #include "base/lazy_instance.h"
  11 #include "base/metrics/histogram.h"
  12 #include "base/metrics/histogram_samples.h"
  13 #include "components/metrics/histogram_encoder.h"
  14
  15 namespace cronet {
  16
  17 // TODO(rtenneti): move g_histogram_manager into java code.
  18 static base::LazyInstance<HistogramManager>::Leaky
  19     g_histogram_manager = LAZY_INSTANCE_INITIALIZER;
  20
  21 HistogramManager::HistogramManager() : histogram_snapshot_manager_(this) {
  22 }
  23
  24 HistogramManager::~HistogramManager() {
  25 }
  26
  27 // static
  28 HistogramManager* HistogramManager::GetInstance() {
  29   return g_histogram_manager.Pointer();
  30 }
  31
  32 void HistogramManager::RecordDelta(const base::HistogramBase& histogram,
  33                                    const base::HistogramSamples& snapshot) {
  34   EncodeHistogramDelta(histogram.histogram_name(), snapshot, &uma_proto_);
  35 }
  36
  37 void HistogramManager::InconsistencyDetected(
  38     base::HistogramBase::Inconsistency problem) {
  39   UMA_HISTOGRAM_ENUMERATION("Histogram.InconsistenciesBrowser.Cronet",
  40                             problem, base::HistogramBase::NEVER_EXCEEDED_VALUE);
  41 }
  42
  43 void HistogramManager::UniqueInconsistencyDetected(
  44     base::HistogramBase::Inconsistency problem) {
  45   UMA_HISTOGRAM_ENUMERATION("Histogram.InconsistenciesBrowserUnique.Cronet",
  46                             problem, base::HistogramBase::NEVER_EXCEEDED_VALUE);
  47 }
  48
  49 void HistogramManager::InconsistencyDetectedInLoggedCount(int amount) {
  50   UMA_HISTOGRAM_COUNTS("Histogram.InconsistentSnapshotBrowser.Cronet",
  51                        std::abs(amount));
  52 }
  53
  54 bool HistogramManager::GetDeltas(std::vector<uint8>* data) {
  55   // Clear the protobuf between calls.
  56   uma_proto_.Clear();
  57   histogram_snapshot_manager_.PrepareDeltas(
  58       base::Histogram::kNoFlags, base::Histogram::kUmaTargetedHistogramFlag);
  59   int32_t data_size = uma_proto_.ByteSize();
  60   data->resize(data_size);
  61   if (uma_proto_.SerializeToArray(&(*data)[0], data_size))
  62     return true;
  63   data->clear();
  64   return false;
  65 }
  66
  67 }  // namespace cronet