137 lines
4.6 KiB
Markdown
137 lines
4.6 KiB
Markdown
---
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phase: 32-state-update-optimization
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plan: 03
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subsystem: ui
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tags: [react, performance, state-colocation, memo]
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# Dependency graph
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requires:
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- phase: 32-state-update-optimization
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provides: Research identifying loading state re-renders as performance issue
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provides:
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- Self-contained JKResyncButton component with colocated loading state
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- Self-contained JKVideoButton component with colocated loading state
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- Simplified JKSessionScreen without video/resync loading state
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affects: [future button components, state colocation patterns]
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# Tech tracking
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tech-stack:
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added: []
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patterns:
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- "State colocation: Loading state lives in component that uses it"
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- "React.memo wrapper on self-contained components"
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- "PropTypes for component documentation"
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key-files:
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created:
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- jam-ui/src/components/client/JKResyncButton.js
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- jam-ui/src/components/client/JKVideoButton.js
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modified:
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- jam-ui/src/components/client/JKSessionScreen.js
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key-decisions:
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- "Colocated loading state in button components to prevent parent re-renders"
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- "memo() wrapper on both buttons for render optimization"
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- "Preserved original behavior: 10-second video timeout, silent resync success"
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patterns-established:
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- "Button components with internal loading state pattern"
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- "Parent passes callbacks, child manages UI state"
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- "displayName for React DevTools debugging"
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# Metrics
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duration: 3min
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completed: 2026-03-05
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---
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# Phase 32 Plan 03: Loading State Colocation Summary
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**Extracted video and resync buttons with colocated loading state using React.memo, eliminating parent re-renders**
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## Performance
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- **Duration:** 3 minutes
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- **Started:** 2026-03-05T19:33:34Z
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- **Completed:** 2026-03-05T19:36:40Z
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- **Tasks:** 3
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- **Files modified:** 3
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## Accomplishments
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- Created self-contained JKResyncButton with local loading state
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- Created self-contained JKVideoButton with local loading state
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- Removed videoLoading and resyncLoading state from JKSessionScreen
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- Loading state changes no longer trigger parent re-renders
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- Simplified JKSessionScreen by 91 lines of code
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Create JKResyncButton component** - `e35bed21e` (feat)
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2. **Task 2: Create JKVideoButton component** - `207598940` (feat)
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3. **Task 3: Refactor JKSessionScreen to use extracted components** - `f5bd1b1cd` (refactor)
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## Files Created/Modified
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**Created:**
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- `jam-ui/src/components/client/JKResyncButton.js` - Self-contained resync button with colocated loading state, memo wrapper, error handling
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- `jam-ui/src/components/client/JKVideoButton.js` - Self-contained video button with colocated loading state, memo wrapper, 10-second timeout
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**Modified:**
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- `jam-ui/src/components/client/JKSessionScreen.js` - Uses new button components, removed videoLoading/resyncLoading state, removed handleVideoClick/handleResync functions, removed unused icon imports (-91 lines)
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## Decisions Made
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**1. State colocation over prop drilling**
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- Loading state lives in the button component that uses it
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- Parent doesn't need to know about loading state
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- Prevents parent re-renders when loading state changes
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- Follows Kent C. Dodds state colocation principle
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**2. memo() wrapper on both components**
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- Prevents re-renders from parent prop stability
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- Combined with colocated state = zero parent impact
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- displayName added for React DevTools debugging
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**3. Preserved original behavior**
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- Video button: 10-second loading timeout (prevents multiple clicks)
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- Resync button: Silent success, toast on error
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- Same error handling logic as original implementation
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- Same permission checks (canVideo, upgrade prompt)
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**4. PropTypes for documentation**
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- Documents expected props for maintainability
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- Runtime validation in development mode
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## Deviations from Plan
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None - plan executed exactly as written.
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## Issues Encountered
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None - straightforward extraction of button components with colocated state.
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## User Setup Required
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None - no external service configuration required.
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## Next Phase Readiness
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**Ready for:**
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- Phase 32 Plan 04: Debounce optimization (remove debounce recreation)
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- Further state colocation opportunities in other components
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**Performance impact:**
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- Eliminates 2 state updates triggering JKSessionScreen re-renders
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- Button loading states isolated to individual components
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- Part of comprehensive re-render reduction strategy (Phase 32)
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**Pattern established:**
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- Self-contained button components with local state
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- Can be replicated for other buttons with loading states
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- Example: record button, broadcast button, attach button
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---
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*Phase: 32-state-update-optimization*
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*Completed: 2026-03-05*
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