Lazy Context Propagation & useContextSelector hook #3
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gnoff
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gnoff
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Jun 14, 2019
| @@ -1049,6 +1049,142 @@ describe('ReactNewContext', () => { | |||
| span(2), | |||
| ]); | |||
| }); | |||
| describe('stress test', () => { | |||
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not suggesting we keep this kind of test in place, but wanted to explore implications of this change in a more demanding environment than most tests produce
| expect(Scheduler).toFlushAndYield(['A: 4', 'B: 4', 'C: 4']); | ||
| } | ||
| }); | ||
| it('non-context stress test', () => { |
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this tests doesn't use context but acts as a comparable of non-context rendering to see if lazy context adds overhead to work in general
| @@ -186,6 +253,198 @@ function scheduleWorkOnParentPath( | |||
| } | |||
| } | |||
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| export function checkContextDependencies( | |||
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much of the new code in this file could be 'unified' with the existing propagation function to save on LoC but it would make the actual algorithm a little harder to see so it is duplicated
This was referenced Jul 8, 2019
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Will end up breaking into separate RFCs and PRs
For now
Lazy Propagation Algorithm: attempts to take advantage of already scheduled work to avoid walking the fiber tree except when necessary (on bailouts that don't go deeper for work on children)
useContextSelector hook: adds a hook that is a modified context reader. it will only schedule work on it's host fiber when the selector value has changed. This hook is intended to be used with the new propagation scheme because it otherwise has numerous problems with selectors running too often / too early.