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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/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::Sample32 min,
HistogramBase::Sample32 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::Sample32 min,
HistogramBase::Sample32 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::Sample32 sample) {
DCHECK_GE(sample, 0);
sample_ = sample;
}
} // namespace base
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