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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 #ifndef COMPONENTS_METRICS_SINGLE_VALUE_HISTOGRAM_FACTORY_IMPL_H_ | |
| 6 #define COMPONENTS_METRICS_SINGLE_VALUE_HISTOGRAM_FACTORY_IMPL_H_ | |
| 7 | |
| 8 #include <string> | |
| 9 | |
| 10 #include "base/metrics/single_sample_metrics.h" | |
| 11 #include "base/threading/thread_local.h" | |
| 12 #include "components/metrics/public/interfaces/single_sample_metrics.mojom.h" | |
| 13 #include "components/metrics/single_sample_metrics.h" | |
| 14 | |
| 15 namespace metrics { | |
| 16 | |
| 17 // SingleSampleMetricsFactory implementation for creating SingleSampleMetric | |
| 18 // instances that communicate over mojo to instances in another process. | |
| 19 // | |
| 20 // Persistance outside of the current process allows these metrics to record a | |
| 21 // sample even in the event of sudden process termination. As an example, this | |
| 22 // is useful for garbage collected objects which may never get a chance to run | |
| 23 // their destructors in the event of a fast shutdown event (process kill). | |
| 24 class SingleSampleMetricsFactoryImpl : public base::SingleSampleMetricsFactory { | |
| 25 public: | |
| 26 // Constructs a factory capable of vending single sample metrics from any | |
| 27 // thread. |create_provider_cb| will be called from arbitrary threads to | |
| 28 // create providers as necessary; the callback must handle thread safety. | |
| 29 // | |
| 30 // We use a callback here to avoid taking additional DEPS on content and a | |
| 31 // service_manager::Connector() for simplicitly and to avoid the need for | |
| 32 // using the service test harness just for instantiating this class. | |
| 33 explicit SingleSampleMetricsFactoryImpl(CreateProviderCB create_provider_cb); | |
| 34 ~SingleSampleMetricsFactoryImpl() override; | |
| 35 | |
| 36 // base::SingleSampleMetricsFactory: | |
| 37 std::unique_ptr<base::SingleSampleMetric> CreateCustomCountsMetric( | |
| 38 const std::string& histogram_name, | |
| 39 base::HistogramBase::Sample min, | |
| 40 base::HistogramBase::Sample max, | |
| 41 uint32_t bucket_count) override; | |
| 42 | |
| 43 // Providers live forever in production, but tests should be kind and clean up | |
| 44 // after themselves to avoid tests trampling on one another. Destroys the | |
| 45 // provider in the TLS slot for the calling thread. | |
| 46 void DestroyProviderForTesting(); | |
| 47 | |
| 48 private: | |
| 49 // Creates a single sample metric. | |
| 50 std::unique_ptr<base::SingleSampleMetric> CreateMetric( | |
| 51 const std::string& histogram_name, | |
| 52 base::HistogramBase::Sample min, | |
| 53 base::HistogramBase::Sample max, | |
| 54 uint32_t bucket_count, | |
| 55 int32_t flags); | |
| 56 | |
| 57 // Gets the SingleSampleMetricsProvider for the current thread. If none | |
| 58 // exists, then a new instance is created and set in the TLS slot. | |
| 59 mojom::SingleSampleMetricsProvider* GetProvider(); | |
| 60 | |
| 61 CreateProviderCB create_provider_cb_; | |
| 62 | |
| 63 // Per thread storage slot for the mojo provider. | |
| 64 base::ThreadLocalPointer<mojom::SingleSampleMetricsProviderPtr> provider_tls_; | |
| 65 | |
| 66 DISALLOW_COPY_AND_ASSIGN(SingleSampleMetricsFactoryImpl); | |
| 67 }; | |
| 68 | |
| 69 } // namespace metrics | |
| 70 | |
| 71 #endif // COMPONENTS_METRICS_SINGLE_VALUE_HISTOGRAM_FACTORY_IMPL_H_ | |
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Chromium Code Reviews
Issue 2862333002:
Revert of Add support for single sample metrics. (Closed)
