diff --git a/.planning/STATE.md b/.planning/STATE.md index fed9fedf0..4aaa867f3 100644 --- a/.planning/STATE.md +++ b/.planning/STATE.md @@ -10,11 +10,11 @@ See: .planning/PROJECT.md (updated 2026-03-03) ## Current Position Phase: 32 of 32 (State Update Optimization) -Plan: 1 of 4 complete (Redundant Operations Fix) +Plan: 3 of 4 complete (Loading State Colocation) Status: In progress -Last activity: 2026-03-05 — Completed 32-01-PLAN.md +Last activity: 2026-03-05 — Completed 32-03-PLAN.md -Progress: [█████████░] 83% +Progress: [█████████░] 85% ## Performance Metrics @@ -26,8 +26,8 @@ Progress: [█████████░] 83% **v1.7 Performance Optimization (In Progress):** - Phases: 5 (phases 28-32) - Phases completed: 4 (Phases 28, 29, 30, 31) -- Requirements: 19 (16 complete) -- Plans completed: 8 +- Requirements: 19 (17 complete) +- Plans completed: 9 ## Accumulated Context @@ -57,6 +57,8 @@ Recent decisions (v1.7): - 1.5s debounce delay for track sync covers mixer initialization window - 32-01 - useDebounceCallback with ref pattern prevents stale closures - 32-01 - useMemo with empty deps creates stable debounced function - 32-01 +- State colocation: Loading state lives in component that uses it - 32-03 +- React.memo on self-contained button components prevents parent re-renders - 32-03 ### Investigation Findings (v1.7) @@ -68,6 +70,7 @@ Recent decisions (v1.7): 5. Debounce instance recreation on dependency change - FIXED (Phase 32-01) 6. Missing React.memo on child components - FIXED (Phase 30) 7. Redundant mixer categorization dispatches - FIXED (Phase 32-02) +8. Loading state in parent causing unnecessary re-renders - FIXED (Phase 32-03) **Hotspot files:** - `useMixerStore.js:178-185` - VU update dispatch - FIXED @@ -102,9 +105,9 @@ Recent decisions (v1.7): ## Session Continuity Last session: 2026-03-05 -Stopped at: Completed 32-01-PLAN.md (Redundant Operations Fix) +Stopped at: Completed 32-03-PLAN.md (Loading State Colocation) Resume file: None **Next steps:** -1. Continue Phase 32 execution with remaining plans -2. Plan verification/performance testing when all optimizations complete +1. Execute 32-04-PLAN.md (Final plan in Phase 32) +2. Plan Phase 33 for verification/performance testing when all optimizations complete diff --git a/.planning/phases/32-state-update-optimization/32-03-SUMMARY.md b/.planning/phases/32-state-update-optimization/32-03-SUMMARY.md new file mode 100644 index 000000000..14882f36a --- /dev/null +++ b/.planning/phases/32-state-update-optimization/32-03-SUMMARY.md @@ -0,0 +1,136 @@ +--- +phase: 32-state-update-optimization +plan: 03 +subsystem: ui +tags: [react, performance, state-colocation, memo] + +# Dependency graph +requires: + - phase: 32-state-update-optimization + provides: Research identifying loading state re-renders as performance issue +provides: + - Self-contained JKResyncButton component with colocated loading state + - Self-contained JKVideoButton component with colocated loading state + - Simplified JKSessionScreen without video/resync loading state +affects: [future button components, state colocation patterns] + +# Tech tracking +tech-stack: + added: [] + patterns: + - "State colocation: Loading state lives in component that uses it" + - "React.memo wrapper on self-contained components" + - "PropTypes for component documentation" + +key-files: + created: + - jam-ui/src/components/client/JKResyncButton.js + - jam-ui/src/components/client/JKVideoButton.js + modified: + - jam-ui/src/components/client/JKSessionScreen.js + +key-decisions: + - "Colocated loading state in button components to prevent parent re-renders" + - "memo() wrapper on both buttons for render optimization" + - "Preserved original behavior: 10-second video timeout, silent resync success" + +patterns-established: + - "Button components with internal loading state pattern" + - "Parent passes callbacks, child manages UI state" + - "displayName for React DevTools debugging" + +# Metrics +duration: 3min +completed: 2026-03-05 +--- + +# Phase 32 Plan 03: Loading State Colocation Summary + +**Extracted video and resync buttons with colocated loading state using React.memo, eliminating parent re-renders** + +## Performance + +- **Duration:** 3 minutes +- **Started:** 2026-03-05T19:33:34Z +- **Completed:** 2026-03-05T19:36:40Z +- **Tasks:** 3 +- **Files modified:** 3 + +## Accomplishments +- Created self-contained JKResyncButton with local loading state +- Created self-contained JKVideoButton with local loading state +- Removed videoLoading and resyncLoading state from JKSessionScreen +- Loading state changes no longer trigger parent re-renders +- Simplified JKSessionScreen by 91 lines of code + +## Task Commits + +Each task was committed atomically: + +1. **Task 1: Create JKResyncButton component** - `e35bed21e` (feat) +2. **Task 2: Create JKVideoButton component** - `207598940` (feat) +3. **Task 3: Refactor JKSessionScreen to use extracted components** - `f5bd1b1cd` (refactor) + +## Files Created/Modified + +**Created:** +- `jam-ui/src/components/client/JKResyncButton.js` - Self-contained resync button with colocated loading state, memo wrapper, error handling +- `jam-ui/src/components/client/JKVideoButton.js` - Self-contained video button with colocated loading state, memo wrapper, 10-second timeout + +**Modified:** +- `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) + +## Decisions Made + +**1. State colocation over prop drilling** +- Loading state lives in the button component that uses it +- Parent doesn't need to know about loading state +- Prevents parent re-renders when loading state changes +- Follows Kent C. Dodds state colocation principle + +**2. memo() wrapper on both components** +- Prevents re-renders from parent prop stability +- Combined with colocated state = zero parent impact +- displayName added for React DevTools debugging + +**3. Preserved original behavior** +- Video button: 10-second loading timeout (prevents multiple clicks) +- Resync button: Silent success, toast on error +- Same error handling logic as original implementation +- Same permission checks (canVideo, upgrade prompt) + +**4. PropTypes for documentation** +- Documents expected props for maintainability +- Runtime validation in development mode + +## Deviations from Plan + +None - plan executed exactly as written. + +## Issues Encountered + +None - straightforward extraction of button components with colocated state. + +## User Setup Required + +None - no external service configuration required. + +## Next Phase Readiness + +**Ready for:** +- Phase 32 Plan 04: Debounce optimization (remove debounce recreation) +- Further state colocation opportunities in other components + +**Performance impact:** +- Eliminates 2 state updates triggering JKSessionScreen re-renders +- Button loading states isolated to individual components +- Part of comprehensive re-render reduction strategy (Phase 32) + +**Pattern established:** +- Self-contained button components with local state +- Can be replicated for other buttons with loading states +- Example: record button, broadcast button, attach button + +--- +*Phase: 32-state-update-optimization* +*Completed: 2026-03-05*