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// Copyright 2017 The Chromium Authors
// 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 <string_view>
#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();
DummyHistogram(const DummyHistogram&) = delete;
DummyHistogram& operator=(const DummyHistogram&) = delete;
// HistogramBase
void CheckName(std::string_view name) const override {}
uint64_t name_hash() const override;
HistogramType GetHistogramType() const override;
bool HasConstructionArguments(Sample32 expected_minimum,
Sample32 expected_maximum,
size_t expected_bucket_count) const override;
void Add(Sample32 value) override {}
void AddCount(Sample32 value, int count) override {}
bool AddSamples(const HistogramSamples& samples) override;
bool AddSamplesFromPickle(PickleIterator* iter) override;
std::unique_ptr<HistogramSamples> SnapshotSamples() const override;
std::unique_ptr<HistogramSamples> SnapshotUnloggedSamples() const override;
void MarkSamplesAsLogged(const HistogramSamples& samples) override {}
std::unique_ptr<HistogramSamples> SnapshotDelta() override;
std::unique_ptr<HistogramSamples> SnapshotFinalDelta() const override;
void WriteAscii(std::string* output) const override {}
Value::Dict ToGraphDict() const override;
protected:
// HistogramBase:
void SerializeInfoImpl(Pickle* pickle) const override {}
Value::Dict GetParameters() const override;
private:
friend class NoDestructor<DummyHistogram>;
DummyHistogram() : HistogramBase(DurableStringView("dummy_histogram")) {}
~DummyHistogram() override = default;
};
} // namespace base
#endif // BASE_METRICS_DUMMY_HISTOGRAM_H_
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