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| 1 // Copyright 2017 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "base/metrics/single_sample_metrics.h" | |
| 6 | |
| 7 #include "base/memory/ptr_util.h" | |
| 8 #include "base/metrics/histogram.h" | |
| 9 | |
| 10 namespace base { | |
| 11 | |
| 12 static SingleSampleMetricsFactory* g_factory = nullptr; | |
| 13 | |
| 14 // static | |
| 15 SingleSampleMetricsFactory* SingleSampleMetricsFactory::Get() { | |
| 16 if (!g_factory) | |
| 17 g_factory = new DefaultSingleSampleMetricsFactory(); | |
| 18 | |
| 19 return g_factory; | |
| 20 } | |
| 21 | |
| 22 // static | |
| 23 void SingleSampleMetricsFactory::SetFactory( | |
| 24 std::unique_ptr<SingleSampleMetricsFactory> factory) { | |
| 25 DCHECK(!g_factory); | |
| 26 g_factory = factory.release(); | |
| 27 } | |
| 28 | |
| 29 // static | |
| 30 void SingleSampleMetricsFactory::DeleteFactoryForTesting() { | |
| 31 DCHECK(g_factory); | |
| 32 delete g_factory; | |
| 33 g_factory = nullptr; | |
| 34 } | |
| 35 | |
| 36 std::unique_ptr<SingleSampleMetric> | |
| 37 DefaultSingleSampleMetricsFactory::CreateCustomCountsMetric( | |
| 38 const std::string& histogram_name, | |
| 39 HistogramBase::Sample min, | |
| 40 HistogramBase::Sample max, | |
| 41 uint32_t bucket_count) { | |
| 42 return MakeUnique<DefaultSingleSampleMetric>( | |
| 43 histogram_name, min, max, bucket_count, | |
| 44 HistogramBase::kUmaTargetedHistogramFlag); | |
| 45 } | |
| 46 | |
| 47 DefaultSingleSampleMetric::DefaultSingleSampleMetric( | |
| 48 const std::string& histogram_name, | |
| 49 HistogramBase::Sample min, | |
| 50 HistogramBase::Sample max, | |
| 51 uint32_t bucket_count, | |
| 52 int32_t flags) | |
| 53 : histogram_(Histogram::FactoryGet(histogram_name, | |
| 54 min, | |
| 55 max, | |
| 56 bucket_count, | |
| 57 flags)) { | |
| 58 // Bad construction parameters may lead to |histogram_| being null; DCHECK to | |
| 59 // find accidental errors in production. We must still handle the nullptr in | |
| 60 // destruction though since this construction may come from another untrusted | |
| 61 // process. | |
| 62 DCHECK(histogram_); | |
| 63 } | |
| 64 | |
| 65 DefaultSingleSampleMetric::~DefaultSingleSampleMetric() { | |
| 66 // |histogram_| may be nullptr if bad construction parameters are given. | |
| 67 if (sample_ < 0 || !histogram_) | |
| 68 return; | |
| 69 histogram_->Add(sample_); | |
| 70 } | |
| 71 | |
| 72 void DefaultSingleSampleMetric::SetSample(HistogramBase::Sample sample) { | |
| 73 DCHECK_GE(sample, 0); | |
| 74 sample_ = sample; | |
| 75 } | |
| 76 | |
| 77 } // namespace base | |
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Chromium Code Reviews
Issue 2862333002:
Revert of Add support for single sample metrics. (Closed)
