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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.
- #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::Sample* min,
- int64_t* max,
- HistogramBase::Count* count) const 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::Sample value,
- HistogramBase::Count count) override {}
- HistogramBase::Count GetCount(HistogramBase::Sample value) const override {
- return HistogramBase::Count();
- }
- HistogramBase::Count TotalCount() const override {
- return HistogramBase::Count();
- }
- std::unique_ptr<SampleCountIterator> Iterator() const override {
- return std::make_unique<DummySampleCountIterator>();
- }
- 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(
- Sample expected_minimum,
- Sample expected_maximum,
- size_t expected_bucket_count) const {
- 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::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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