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
Summary:
Changelog: [internal]
This is a mechanism that will guess event's React priority based on other events ongoing on the platform.
If an event happens within span of ContinuousStart -> ContinuousEnd and its category is unspecified, we deduce it's React priority to be default. All other events are discrete.
Special case: `onScroll`, which is always treated as "Default".
Reviewed By: JoshuaGross
Differential Revision: D28485060
fbshipit-source-id: d2eae63dbcf03271dfed97128a1590dd165a3ce2
Summary:
Changelog: [internal]
Pulling out event queue processing to its separate class. We will be adding more logic there so it makes sense to separate it for simplicity and testability purposes.
Alternative names that came to mind: `EventsProcessor`, `EventsDispatcher`.
Reviewed By: JoshuaGross
Differential Revision: D28572283
fbshipit-source-id: 1cb2459f616b9995f66da80d50c401e68002da7f
Ruslan Shestopalyuk
Samuel Susla
Andres Suarez
Samuel Susla