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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.
#ifndef BASE_METRICS_SPARSE_HISTOGRAM_H_
#define BASE_METRICS_SPARSE_HISTOGRAM_H_
#include <map>
#include <string>
#include "base/base_export.h"
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "base/metrics/histogram_base.h"
#include "base/synchronization/lock.h"
namespace base {
class HistogramSamples;
class BASE_EXPORT_PRIVATE SparseHistogram : public HistogramBase {
public:
// If there's one with same name, return the existing one. If not, create a
// new one.
static HistogramBase* FactoryGet(const std::string& name, int32 flags);
virtual ~SparseHistogram();
// HistogramBase implementation:
virtual void Add(Sample value) OVERRIDE;
virtual void WriteHTMLGraph(std::string* output) const OVERRIDE;
virtual void WriteAscii(std::string* output) const OVERRIDE;
virtual scoped_ptr<HistogramSamples> SnapshotSamples() const OVERRIDE;
private:
// Clients should always use FactoryGet to create SparseHistogram.
SparseHistogram(const std::string& name);
virtual void GetParameters(DictionaryValue* params) const OVERRIDE;
virtual void GetCountAndBucketData(Count* count,
ListValue* buckets) const OVERRIDE;
friend class SparseHistogramTest; // For constuctor calling.
// Protects access to |sample_counts_| and |redundant_count_|.
mutable base::Lock lock_;
std::map<HistogramBase::Sample, HistogramBase::Count> sample_counts_;
HistogramBase::Count redundant_count_;
DISALLOW_COPY_AND_ASSIGN(SparseHistogram);
};
} // namespace base
#endif // BASE_METRICS_SPARSE_HISTOGRAM_H_
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