118 lines
3.8 KiB
C
118 lines
3.8 KiB
C
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_METRICS_SPARSE_HISTOGRAM_H_
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#define BASE_METRICS_SPARSE_HISTOGRAM_H_
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#include <map>
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#include <string>
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#include "base/base_export.h"
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#include "base/basictypes.h"
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#include "base/compiler_specific.h"
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#include "base/logging.h"
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#include "base/memory/scoped_ptr.h"
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#include "base/metrics/histogram_base.h"
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#include "base/metrics/sample_map.h"
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#include "base/synchronization/lock.h"
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namespace base {
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// The common code for different SparseHistogram macros.
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#define HISTOGRAM_SPARSE_COMMON(name, sample, flag) \
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do { \
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base::HistogramBase* histogram( \
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base::SparseHistogram::FactoryGet(name, flag)); \
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DCHECK_EQ(histogram->histogram_name(), name); \
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histogram->Add(sample); \
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} while (0)
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#define HISTOGRAM_SPARSE_SLOWLY(name, sample) \
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HISTOGRAM_SPARSE_COMMON(name, sample, base::HistogramBase::kNoFlags)
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#define UMA_HISTOGRAM_SPARSE_SLOWLY(name, sample) \
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HISTOGRAM_SPARSE_COMMON(name, sample, \
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base::HistogramBase::kUmaTargetedHistogramFlag)
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//------------------------------------------------------------------------------
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// Define debug only version of macros.
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#ifndef NDEBUG
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#define DHISTOGRAM_SPARSE_SLOWLY(name, sample) \
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HISTOGRAM_SPARSE_SLOWLY(name, sample)
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#else // NDEBUG
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#define DHISTOGRAM_SPARSE_SLOWLY(name, sample) \
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while (0) { \
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static_cast<void>(name); \
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static_cast<void>(sample); \
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}
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#endif // NDEBUG
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class HistogramSamples;
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class BASE_EXPORT_PRIVATE SparseHistogram : public HistogramBase {
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public:
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// If there's one with same name, return the existing one. If not, create a
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// new one.
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static HistogramBase* FactoryGet(const std::string& name, int32 flags);
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virtual ~SparseHistogram();
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// HistogramBase implementation:
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virtual HistogramType GetHistogramType() const OVERRIDE;
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virtual bool HasConstructionArguments(
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Sample expected_minimum,
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Sample expected_maximum,
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size_t expected_bucket_count) const OVERRIDE;
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virtual void Add(Sample value) OVERRIDE;
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virtual void AddSamples(const HistogramSamples& samples) OVERRIDE;
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virtual bool AddSamplesFromPickle(PickleIterator* iter) OVERRIDE;
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virtual scoped_ptr<HistogramSamples> SnapshotSamples() const OVERRIDE;
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virtual void WriteHTMLGraph(std::string* output) const OVERRIDE;
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virtual void WriteAscii(std::string* output) const OVERRIDE;
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protected:
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// HistogramBase implementation:
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virtual bool SerializeInfoImpl(Pickle* pickle) const OVERRIDE;
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private:
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// Clients should always use FactoryGet to create SparseHistogram.
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explicit SparseHistogram(const std::string& name);
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friend BASE_EXPORT_PRIVATE HistogramBase* DeserializeHistogramInfo(
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PickleIterator* iter);
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static HistogramBase* DeserializeInfoImpl(PickleIterator* iter);
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virtual void GetParameters(DictionaryValue* params) const OVERRIDE;
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virtual void GetCountAndBucketData(Count* count,
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int64* sum,
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ListValue* buckets) const OVERRIDE;
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// Helpers for emitting Ascii graphic. Each method appends data to output.
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void WriteAsciiImpl(bool graph_it,
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const std::string& newline,
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std::string* output) const;
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// Write a common header message describing this histogram.
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void WriteAsciiHeader(const Count total_count,
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std::string* output) const;
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// For constuctor calling.
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friend class SparseHistogramTest;
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// Protects access to |samples_|.
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mutable base::Lock lock_;
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SampleMap samples_;
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DISALLOW_COPY_AND_ASSIGN(SparseHistogram);
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};
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} // namespace base
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#endif // BASE_METRICS_SPARSE_HISTOGRAM_H_
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