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// Copyright 2017 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_DUMMY_HISTOGRAM_H_
#define BASE_METRICS_DUMMY_HISTOGRAM_H_
#include <stdint.h>
#include <memory>
#include <string>
#include "base/base_export.h"
#include "base/metrics/histogram_base.h"
#include "base/no_destructor.h"
#include "base/values.h"
namespace base {
// DummyHistogram is used for mocking histogram objects for histograms that
// shouldn't be recorded. It doesn't do any actual processing.
class BASE_EXPORT DummyHistogram : public HistogramBase {
public:
static DummyHistogram* GetInstance();
// HistogramBase:
void CheckName(const StringPiece& name) const override {}
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(PickleIterator* iter) override;
std::unique_ptr<HistogramSamples> SnapshotSamples() const override;
std::unique_ptr<HistogramSamples> SnapshotDelta() override;
std::unique_ptr<HistogramSamples> SnapshotFinalDelta() const override;
void WriteAscii(std::string* output) const override {}
base::DictionaryValue ToGraphDict() const override;
protected:
// HistogramBase:
void SerializeInfoImpl(Pickle* pickle) const override {}
void GetParameters(DictionaryValue* params) const override {}
void GetCountAndBucketData(Count* count,
int64_t* sum,
ListValue* buckets) const override {}
private:
friend class NoDestructor<DummyHistogram>;
DummyHistogram() : HistogramBase("dummy_histogram") {}
~DummyHistogram() override {}
DISALLOW_COPY_AND_ASSIGN(DummyHistogram);
};
} // namespace base
#endif // BASE_METRICS_DUMMY_HISTOGRAM_H_
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