110 lines
3.8 KiB
C++
110 lines
3.8 KiB
C++
// 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 <stddef.h>
|
|
#include <stdint.h>
|
|
|
|
#include <map>
|
|
#include <memory>
|
|
#include <string>
|
|
|
|
#include "base/base_export.h"
|
|
#include "base/macros.h"
|
|
#include "base/metrics/histogram_base.h"
|
|
#include "base/metrics/histogram_samples.h"
|
|
#include "base/synchronization/lock.h"
|
|
|
|
namespace base {
|
|
|
|
class HistogramSamples;
|
|
class PersistentHistogramAllocator;
|
|
class Pickle;
|
|
class PickleIterator;
|
|
|
|
class BASE_EXPORT 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_t flags);
|
|
|
|
// Create a histogram using data in persistent storage. The allocator must
|
|
// live longer than the created sparse histogram.
|
|
static std::unique_ptr<HistogramBase> PersistentCreate(
|
|
PersistentHistogramAllocator* allocator,
|
|
const char* name,
|
|
HistogramSamples::Metadata* meta,
|
|
HistogramSamples::Metadata* logged_meta);
|
|
|
|
~SparseHistogram() override;
|
|
|
|
// HistogramBase implementation:
|
|
uint64_t name_hash() const override;
|
|
HistogramType GetHistogramType() const override;
|
|
bool HasConstructionArguments(Sample expected_minimum,
|
|
Sample expected_maximum,
|
|
uint32_t expected_bucket_count) const override;
|
|
void Add(Sample value) override;
|
|
void AddCount(Sample value, int count) override;
|
|
void AddSamples(const HistogramSamples& samples) override;
|
|
bool AddSamplesFromPickle(base::PickleIterator* iter) override;
|
|
std::unique_ptr<HistogramSamples> SnapshotSamples() const override;
|
|
std::unique_ptr<HistogramSamples> SnapshotDelta() override;
|
|
std::unique_ptr<HistogramSamples> SnapshotFinalDelta() const override;
|
|
void WriteHTMLGraph(std::string* output) const override;
|
|
void WriteAscii(std::string* output) const override;
|
|
|
|
protected:
|
|
// HistogramBase implementation:
|
|
void SerializeInfoImpl(base::Pickle* pickle) const override;
|
|
|
|
private:
|
|
// Clients should always use FactoryGet to create SparseHistogram.
|
|
explicit SparseHistogram(const char* name);
|
|
|
|
SparseHistogram(PersistentHistogramAllocator* allocator,
|
|
const char* name,
|
|
HistogramSamples::Metadata* meta,
|
|
HistogramSamples::Metadata* logged_meta);
|
|
|
|
friend BASE_EXPORT HistogramBase* DeserializeHistogramInfo(
|
|
base::PickleIterator* iter);
|
|
static HistogramBase* DeserializeInfoImpl(base::PickleIterator* iter);
|
|
|
|
void GetParameters(DictionaryValue* params) const override;
|
|
void GetCountAndBucketData(Count* count,
|
|
int64_t* sum,
|
|
ListValue* buckets) const override;
|
|
|
|
// Helpers for emitting Ascii graphic. Each method appends data to output.
|
|
void WriteAsciiBody(const HistogramSamples& snapshot,
|
|
bool graph_it,
|
|
const std::string& newline,
|
|
std::string* output) const;
|
|
|
|
// Write a common header message describing this histogram.
|
|
void WriteAsciiHeader(const HistogramSamples& snapshot,
|
|
std::string* output) const;
|
|
|
|
// For constuctor calling.
|
|
friend class SparseHistogramTest;
|
|
|
|
// Protects access to |samples_|.
|
|
mutable base::Lock lock_;
|
|
|
|
// Flag to indicate if PrepareFinalDelta has been previously called.
|
|
mutable bool final_delta_created_ = false;
|
|
|
|
std::unique_ptr<HistogramSamples> unlogged_samples_;
|
|
std::unique_ptr<HistogramSamples> logged_samples_;
|
|
|
|
DISALLOW_COPY_AND_ASSIGN(SparseHistogram);
|
|
};
|
|
|
|
} // namespace base
|
|
|
|
#endif // BASE_METRICS_SPARSE_HISTOGRAM_H_
|