mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Ruslan Shestopalyuk
09ad0cc0c6
Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/35768 Changelog: [Internal] This implements native side mechanics for reporting user events timing to JS (PerformanceObserver API). See the standard for more details: https://www.w3.org/TR/event-timing/ The events are only logged when there are any active subscriptions (via `PerformanceObserver.observe`), also we only log "discrete events" (i.e. no likes of mouse move), so the overhead is non-existing. There are two main metrics of interest for an event lifecycle: * Time the event is spent in the queue, i.e. the time between it's created and dispatched * Time that is spend in the event handler on the JS side (event dispatch), or processing time Both of these are measured, and the corresponding fields are populated. Reviewed By: sammy-SC Differential Revision: D42294947 fbshipit-source-id: 4fd7938c04b942400befa4057d4929fb2763cee1
45 lines
1.1 KiB
C++
45 lines
1.1 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#pragma once
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namespace facebook::react {
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using EventTag = unsigned int;
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/*
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* Interface for logging discrete events (such as pointerenter/leave),
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* which can be used for implementing W3C Event Timing API standard,
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* see https://www.w3.org/TR/event-timing
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*/
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class EventLogger {
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public:
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virtual ~EventLogger() = default;
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/*
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* Called when an event is first created, returns and unique tag for this
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* event, which can be used to log further event processing stages.
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*/
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virtual EventTag onEventStart(const char *name) = 0;
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/*
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* Called when event starts getting dispatched (processed by the handlers, if
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* any)
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*/
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virtual void onEventDispatch(EventTag tag) = 0;
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/*
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* Called when event finishes being dispatched
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*/
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virtual void onEventEnd(EventTag tag) = 0;
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};
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void setEventLogger(EventLogger *eventLogger);
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EventLogger *getEventLogger();
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} // namespace facebook::react
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