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109 lines
3.7 KiB
C++
109 lines
3.7 KiB
C++
// 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 <stddef.h>
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#include <stdint.h>
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#include <map>
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#include <memory>
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#include <string>
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#include "base/base_export.h"
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#include "base/macros.h"
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#include "base/metrics/histogram_base.h"
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#include "base/metrics/histogram_samples.h"
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#include "base/synchronization/lock.h"
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namespace base {
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class HistogramSamples;
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class PersistentHistogramAllocator;
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class Pickle;
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class PickleIterator;
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class BASE_EXPORT 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_t flags);
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// Create a histogram using data in persistent storage. The allocator must
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// live longer than the created sparse histogram.
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static std::unique_ptr<HistogramBase> PersistentCreate(
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PersistentHistogramAllocator* allocator,
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const char* name,
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HistogramSamples::Metadata* meta,
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HistogramSamples::Metadata* logged_meta);
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~SparseHistogram() override;
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// HistogramBase implementation:
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uint64_t name_hash() const override;
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HistogramType GetHistogramType() const override;
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bool HasConstructionArguments(Sample expected_minimum,
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Sample expected_maximum,
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uint32_t expected_bucket_count) const override;
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void Add(Sample value) override;
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void AddCount(Sample value, int count) override;
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void AddSamples(const HistogramSamples& samples) override;
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bool AddSamplesFromPickle(base::PickleIterator* iter) override;
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std::unique_ptr<HistogramSamples> SnapshotSamples() const override;
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std::unique_ptr<HistogramSamples> SnapshotDelta() override;
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std::unique_ptr<HistogramSamples> SnapshotFinalDelta() const override;
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void WriteHTMLGraph(std::string* output) const override;
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void WriteAscii(std::string* output) const override;
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protected:
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// HistogramBase implementation:
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void SerializeInfoImpl(base::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 char* name);
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SparseHistogram(PersistentHistogramAllocator* allocator,
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const char* name,
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HistogramSamples::Metadata* meta,
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HistogramSamples::Metadata* logged_meta);
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friend BASE_EXPORT HistogramBase* DeserializeHistogramInfo(
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base::PickleIterator* iter);
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static HistogramBase* DeserializeInfoImpl(base::PickleIterator* iter);
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void GetParameters(DictionaryValue* params) const override;
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void GetCountAndBucketData(Count* count,
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int64_t* 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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// Flag to indicate if PrepareFinalDelta has been previously called.
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mutable bool final_delta_created_ = false;
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std::unique_ptr<HistogramSamples> unlogged_samples_;
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std::unique_ptr<HistogramSamples> logged_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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