// 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 factory) { DCHECK(!g_factory); g_factory = factory.release(); } // static void SingleSampleMetricsFactory::DeleteFactoryForTesting() { DCHECK(g_factory); delete g_factory; g_factory = nullptr; } std::unique_ptr DefaultSingleSampleMetricsFactory::CreateCustomCountsMetric( const std::string& histogram_name, HistogramBase::Sample min, HistogramBase::Sample max, uint32_t bucket_count) { return std::make_unique( 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