1 // Copyright 2017 The Chromium Authors 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_SAMPLE_METRICS_H_ 6 #define COMPONENTS_METRICS_SINGLE_SAMPLE_METRICS_H_ 7 8 #include "base/functional/callback.h" 9 #include "components/metrics/public/mojom/single_sample_metrics.mojom.h" 10 #include "mojo/public/cpp/bindings/pending_receiver.h" 11 12 namespace metrics { 13 14 using CreateProviderCB = base::RepeatingCallback<void( 15 mojo::PendingReceiver<mojom::SingleSampleMetricsProvider>)>; 16 17 // Initializes and sets the base::SingleSampleMetricsFactory for the current 18 // process. |create_provider_cb| is used to create provider instances per each 19 // thread that the factory is used on; this is necessary since the underlying 20 // providers must only be used on the same thread as construction. 21 // 22 // We use a callback here to avoid taking additional DEPS on content and a 23 // service_manager::Connector() for simplicity and to avoid the need for 24 // using the service test harness in metrics unittests. 25 // 26 // Typically this is called in the process where termination may occur without 27 // warning; e.g. perhaps a renderer process. 28 extern void InitializeSingleSampleMetricsFactory( 29 CreateProviderCB create_provider_cb); 30 31 // Creates a mojom::SingleSampleMetricsProvider capable of vending single sample 32 // metrics attached to a mojo pipe. 33 // 34 // Typically this is given to a service_manager::BinderRegistry in the process 35 // that has a deterministic shutdown path and which serves as a stable endpoint 36 // for the factory created by the above initialize method in another process. 37 extern void CreateSingleSampleMetricsProvider( 38 mojo::PendingReceiver<mojom::SingleSampleMetricsProvider> receiver); 39 40 } // namespace metrics 41 42 #endif // COMPONENTS_METRICS_SINGLE_SAMPLE_METRICS_H_ 43