base/metrics/sparse_histogram.cc

   1 // Copyright (c) 2012 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 "base/metrics/sparse_histogram.h"
   6
   7 #include "base/metrics/statistics_recorder.h"
   8 #include "base/synchronization/lock.h"
   9
  10 using std::map;
  11 using std::string;
  12
  13 namespace base {
  14
  15 typedef HistogramBase::Count Count;
  16 typedef HistogramBase::Sample Sample;
  17
  18 // static
  19 HistogramBase* SparseHistogram::FactoryGet(const string& name, int32 flags) {
  20   // TODO(kaiwang): Register and get SparseHistogram with StatisticsRecorder.
  21   HistogramBase* histogram = new SparseHistogram(name);
  22   histogram->SetFlags(flags);
  23   return histogram;
  24 }
  25
  26 SparseHistogram::~SparseHistogram() {}
  27
  28 void SparseHistogram::Add(Sample value) {
  29   base::AutoLock auto_lock(lock_);
  30   sample_counts_[value]++;
  31   redundant_count_ += 1;
  32 }
  33
  34 scoped_ptr<SampleMap> SparseHistogram::SnapshotSamples() const {
  35   scoped_ptr<SampleMap> snapshot(new SampleMap());
  36
  37   base::AutoLock auto_lock(lock_);
  38   for(map<Sample, Count>::const_iterator it = sample_counts_.begin();
  39       it != sample_counts_.end();
  40       ++it) {
  41     snapshot->Accumulate(it->first, it->second);
  42   }
  43   snapshot->ResetRedundantCount(redundant_count_);
  44   return snapshot.Pass();
  45 }
  46
  47 void SparseHistogram::WriteHTMLGraph(string* output) const {
  48   // TODO(kaiwang): Implement.
  49 }
  50
  51 void SparseHistogram::WriteAscii(string* output) const {
  52   // TODO(kaiwang): Implement.
  53 }
  54
  55 SparseHistogram::SparseHistogram(const string& name)
  56     : HistogramBase(name),
  57       redundant_count_(0) {}
  58
  59 void SparseHistogram::GetParameters(DictionaryValue* params) const {
  60   // TODO(kaiwang): Implement. (See HistogramBase::WriteJSON.)
  61 }
  62
  63 void SparseHistogram::GetCountAndBucketData(Count* count,
  64                                             ListValue* buckets) const {
  65   // TODO(kaiwang): Implement. (See HistogramBase::WriteJSON.)
  66 }
  67
  68 }  // namespace base