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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/single_sample_metrics.h"
- #include "base/memory/ptr_util.h"
- #include "base/metrics/histogram.h"
- namespace base {
- static SingleSampleMetricsFactory* g_factory = nullptr;
- // static
- SingleSampleMetricsFactory* SingleSampleMetricsFactory::Get() {
- if (!g_factory)
- g_factory = new DefaultSingleSampleMetricsFactory();
- return g_factory;
- }
- // static
- void SingleSampleMetricsFactory::SetFactory(
- std::unique_ptr<SingleSampleMetricsFactory> factory) {
- DCHECK(!g_factory);
- g_factory = factory.release();
- }
- // static
- void SingleSampleMetricsFactory::DeleteFactoryForTesting() {
- DCHECK(g_factory);
- delete g_factory;
- g_factory = nullptr;
- }
- std::unique_ptr<SingleSampleMetric>
- DefaultSingleSampleMetricsFactory::CreateCustomCountsMetric(
- const std::string& histogram_name,
- HistogramBase::Sample min,
- HistogramBase::Sample max,
- uint32_t bucket_count) {
- return std::make_unique<DefaultSingleSampleMetric>(
- histogram_name, min, max, bucket_count,
- HistogramBase::kUmaTargetedHistogramFlag);
- }
- DefaultSingleSampleMetric::DefaultSingleSampleMetric(
- const std::string& histogram_name,
- HistogramBase::Sample min,
- HistogramBase::Sample max,
- uint32_t bucket_count,
- int32_t flags)
- : histogram_(Histogram::FactoryGet(histogram_name,
- min,
- max,
- bucket_count,
- flags)) {
- // Bad construction parameters may lead to |histogram_| being null; DCHECK to
- // find accidental errors in production. We must still handle the nullptr in
- // destruction though since this construction may come from another untrusted
- // process.
- DCHECK(histogram_);
- }
- DefaultSingleSampleMetric::~DefaultSingleSampleMetric() {
- // |histogram_| may be nullptr if bad construction parameters are given.
- if (sample_ < 0 || !histogram_)
- return;
- histogram_->Add(sample_);
- }
- void DefaultSingleSampleMetric::SetSample(HistogramBase::Sample sample) {
- DCHECK_GE(sample, 0);
- sample_ = sample;
- }
- } // namespace base
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