single_sample_metrics.cc 2.9 KB

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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. #include "components/metrics/single_sample_metrics.h"
  5. #include <memory>
  6. #include <utility>
  7. #include "base/metrics/single_sample_metrics.h"
  8. #include "base/threading/thread_checker.h"
  9. #include "components/metrics/single_sample_metrics_factory_impl.h"
  10. #include "mojo/public/cpp/bindings/pending_receiver.h"
  11. #include "mojo/public/cpp/bindings/self_owned_receiver.h"
  12. namespace metrics {
  13. namespace {
  14. class MojoSingleSampleMetric : public mojom::SingleSampleMetric {
  15. public:
  16. MojoSingleSampleMetric(const std::string& histogram_name,
  17. base::HistogramBase::Sample min,
  18. base::HistogramBase::Sample max,
  19. uint32_t bucket_count,
  20. int32_t flags)
  21. : metric_(histogram_name, min, max, bucket_count, flags) {}
  22. MojoSingleSampleMetric(const MojoSingleSampleMetric&) = delete;
  23. MojoSingleSampleMetric& operator=(const MojoSingleSampleMetric&) = delete;
  24. ~MojoSingleSampleMetric() override {}
  25. private:
  26. // mojom::SingleSampleMetric:
  27. void SetSample(base::HistogramBase::Sample sample) override {
  28. metric_.SetSample(sample);
  29. }
  30. base::DefaultSingleSampleMetric metric_;
  31. };
  32. class MojoSingleSampleMetricsProvider
  33. : public mojom::SingleSampleMetricsProvider {
  34. public:
  35. MojoSingleSampleMetricsProvider() {}
  36. MojoSingleSampleMetricsProvider(const MojoSingleSampleMetricsProvider&) =
  37. delete;
  38. MojoSingleSampleMetricsProvider& operator=(
  39. const MojoSingleSampleMetricsProvider&) = delete;
  40. ~MojoSingleSampleMetricsProvider() override {
  41. DCHECK(thread_checker_.CalledOnValidThread());
  42. }
  43. private:
  44. // mojom::SingleSampleMetricsProvider:
  45. void AcquireSingleSampleMetric(
  46. const std::string& histogram_name,
  47. base::HistogramBase::Sample min,
  48. base::HistogramBase::Sample max,
  49. uint32_t bucket_count,
  50. int32_t flags,
  51. mojo::PendingReceiver<mojom::SingleSampleMetric> receiver) override {
  52. DCHECK(thread_checker_.CalledOnValidThread());
  53. mojo::MakeSelfOwnedReceiver(
  54. std::make_unique<MojoSingleSampleMetric>(histogram_name, min, max,
  55. bucket_count, flags),
  56. std::move(receiver));
  57. }
  58. // Providers must be created, used on, and destroyed on the same thread.
  59. base::ThreadChecker thread_checker_;
  60. };
  61. } // namespace
  62. // static
  63. void InitializeSingleSampleMetricsFactory(CreateProviderCB create_provider_cb) {
  64. base::SingleSampleMetricsFactory::SetFactory(
  65. std::make_unique<SingleSampleMetricsFactoryImpl>(
  66. std::move(create_provider_cb)));
  67. }
  68. // static
  69. void CreateSingleSampleMetricsProvider(
  70. mojo::PendingReceiver<mojom::SingleSampleMetricsProvider> receiver) {
  71. mojo::MakeSelfOwnedReceiver(
  72. std::make_unique<MojoSingleSampleMetricsProvider>(), std::move(receiver));
  73. }
  74. } // namespace metrics