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// 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.
#include "base/metrics/sparse_histogram.h"
#include "base/metrics/sample_map.h"
#include "base/metrics/statistics_recorder.h"
#include "base/synchronization/lock.h"
using std::map;
using std::string;
namespace base {
typedef HistogramBase::Count Count;
typedef HistogramBase::Sample Sample;
// static
HistogramBase* SparseHistogram::FactoryGet(const string& name, int32 flags) {
// TODO(kaiwang): Register and get SparseHistogram with StatisticsRecorder.
HistogramBase* histogram = new SparseHistogram(name);
histogram->SetFlags(flags);
return histogram;
}
SparseHistogram::~SparseHistogram() {}
HistogramType SparseHistogram::GetHistogramType() const {
return SPARSE_HISTOGRAM;
}
bool SparseHistogram::HasConstructionArguments(Sample minimum,
Sample maximum,
size_t bucket_count) const {
// SparseHistogram never has min/max/bucket_count limit.
return false;
}
void SparseHistogram::Add(Sample value) {
base::AutoLock auto_lock(lock_);
sample_counts_[value]++;
redundant_count_ += 1;
}
scoped_ptr<HistogramSamples> SparseHistogram::SnapshotSamples() const {
scoped_ptr<SampleMap> snapshot(new SampleMap());
base::AutoLock auto_lock(lock_);
for(map<Sample, Count>::const_iterator it = sample_counts_.begin();
it != sample_counts_.end();
++it) {
snapshot->Accumulate(it->first, it->second);
}
snapshot->ResetRedundantCount(redundant_count_);
return snapshot.PassAs<HistogramSamples>();
}
void SparseHistogram::WriteHTMLGraph(string* output) const {
// TODO(kaiwang): Implement.
}
void SparseHistogram::WriteAscii(string* output) const {
// TODO(kaiwang): Implement.
}
SparseHistogram::SparseHistogram(const string& name)
: HistogramBase(name),
redundant_count_(0) {}
void SparseHistogram::GetParameters(DictionaryValue* params) const {
// TODO(kaiwang): Implement. (See HistogramBase::WriteJSON.)
}
void SparseHistogram::GetCountAndBucketData(Count* count,
ListValue* buckets) const {
// TODO(kaiwang): Implement. (See HistogramBase::WriteJSON.)
}
} // namespace base
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