103 lines
2.7 KiB
C++
103 lines
2.7 KiB
C++
// Copyright 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/metrics/dummy_histogram.h"
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#include <memory>
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#include "base/logging.h"
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#include "base/metrics/histogram_samples.h"
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#include "base/metrics/metrics_hashes.h"
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namespace base {
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namespace {
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// Helper classes for DummyHistogram.
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class DummySampleCountIterator : public SampleCountIterator {
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public:
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DummySampleCountIterator() {}
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~DummySampleCountIterator() override {}
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// SampleCountIterator:
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bool Done() const override { return true; }
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void Next() override { NOTREACHED(); }
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void Get(HistogramBase::Sample* min,
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int64_t* max,
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HistogramBase::Count* count) const override {
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NOTREACHED();
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}
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private:
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DISALLOW_COPY_AND_ASSIGN(DummySampleCountIterator);
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};
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class DummyHistogramSamples : public HistogramSamples {
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public:
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explicit DummyHistogramSamples() : HistogramSamples(0, new LocalMetadata()) {}
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~DummyHistogramSamples() override {
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delete static_cast<LocalMetadata*>(meta());
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}
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// HistogramSamples:
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void Accumulate(HistogramBase::Sample value,
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HistogramBase::Count count) override {}
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HistogramBase::Count GetCount(HistogramBase::Sample value) const override {
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return HistogramBase::Count();
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}
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HistogramBase::Count TotalCount() const override {
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return HistogramBase::Count();
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}
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std::unique_ptr<SampleCountIterator> Iterator() const override {
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return std::make_unique<DummySampleCountIterator>();
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}
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bool AddSubtractImpl(SampleCountIterator* iter, Operator op) override {
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return true;
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}
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private:
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DISALLOW_COPY_AND_ASSIGN(DummyHistogramSamples);
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};
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} // namespace
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// static
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DummyHistogram* DummyHistogram::GetInstance() {
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static base::NoDestructor<DummyHistogram> dummy_histogram;
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return dummy_histogram.get();
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}
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uint64_t DummyHistogram::name_hash() const {
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return HashMetricName(histogram_name());
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}
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HistogramType DummyHistogram::GetHistogramType() const {
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return DUMMY_HISTOGRAM;
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}
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bool DummyHistogram::HasConstructionArguments(
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Sample expected_minimum,
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Sample expected_maximum,
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uint32_t expected_bucket_count) const {
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return true;
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}
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bool DummyHistogram::AddSamplesFromPickle(PickleIterator* iter) {
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return true;
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}
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std::unique_ptr<HistogramSamples> DummyHistogram::SnapshotSamples() const {
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return std::make_unique<DummyHistogramSamples>();
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}
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std::unique_ptr<HistogramSamples> DummyHistogram::SnapshotDelta() {
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return std::make_unique<DummyHistogramSamples>();
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}
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std::unique_ptr<HistogramSamples> DummyHistogram::SnapshotFinalDelta() const {
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return std::make_unique<DummyHistogramSamples>();
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}
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} // namespace base
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