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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.
#include "base/metrics/dummy_histogram.h"
#include <memory>
#include "base/metrics/histogram_samples.h"
#include "base/metrics/metrics_hashes.h"
#include "base/no_destructor.h"
#include "base/notreached.h"
#include "base/values.h"
namespace base {
namespace {
// Helper classes for DummyHistogram.
class DummySampleCountIterator : public SampleCountIterator {
public:
DummySampleCountIterator() = default;
DummySampleCountIterator(const DummySampleCountIterator&) = delete;
DummySampleCountIterator& operator=(const DummySampleCountIterator&) = delete;
~DummySampleCountIterator() override = default;
// SampleCountIterator:
bool Done() const override { return true; }
void Next() override { NOTREACHED(); }
void Get(HistogramBase::Sample32* min,
int64_t* max,
HistogramBase::Count32* count) override {
NOTREACHED();
}
};
class DummyHistogramSamples : public HistogramSamples {
public:
DummyHistogramSamples()
: HistogramSamples(0, std::make_unique<LocalMetadata>()) {}
DummyHistogramSamples(const DummyHistogramSamples&) = delete;
DummyHistogramSamples& operator=(const DummyHistogramSamples&) = delete;
// HistogramSamples:
void Accumulate(HistogramBase::Sample32 value,
HistogramBase::Count32 count) override {}
HistogramBase::Count32 GetCount(HistogramBase::Sample32 value) const override {
return HistogramBase::Count32();
}
HistogramBase::Count32 TotalCount() const override {
return HistogramBase::Count32();
}
std::unique_ptr<SampleCountIterator> Iterator() const override {
return std::make_unique<DummySampleCountIterator>();
}
std::unique_ptr<SampleCountIterator> ExtractingIterator() override {
return std::make_unique<DummySampleCountIterator>();
}
bool IsDefinitelyEmpty() const override { NOTREACHED(); }
bool AddSubtractImpl(SampleCountIterator* iter, Operator op) override {
return true;
}
};
} // namespace
// static
DummyHistogram* DummyHistogram::GetInstance() {
static base::NoDestructor<DummyHistogram> dummy_histogram;
return dummy_histogram.get();
}
uint64_t DummyHistogram::name_hash() const {
return HashMetricName(histogram_name());
}
HistogramType DummyHistogram::GetHistogramType() const {
return DUMMY_HISTOGRAM;
}
bool DummyHistogram::HasConstructionArguments(
Sample32 expected_minimum,
Sample32 expected_maximum,
size_t expected_bucket_count) const {
return true;
}
bool DummyHistogram::AddSamples(const HistogramSamples& samples) {
return true;
}
bool DummyHistogram::AddSamplesFromPickle(PickleIterator* iter) {
return true;
}
std::unique_ptr<HistogramSamples> DummyHistogram::SnapshotSamples() const {
return std::make_unique<DummyHistogramSamples>();
}
std::unique_ptr<HistogramSamples> DummyHistogram::SnapshotUnloggedSamples()
const {
return std::make_unique<DummyHistogramSamples>();
}
std::unique_ptr<HistogramSamples> DummyHistogram::SnapshotDelta() {
return std::make_unique<DummyHistogramSamples>();
}
std::unique_ptr<HistogramSamples> DummyHistogram::SnapshotFinalDelta() const {
return std::make_unique<DummyHistogramSamples>();
}
Value::Dict DummyHistogram::ToGraphDict() const {
return Value::Dict();
}
Value::Dict DummyHistogram::GetParameters() const {
return Value::Dict();
}
} // namespace base
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