From 2a06f8bc1eeea504967264af8691fadbe57dee5a Mon Sep 17 00:00:00 2001 From: Nuwan Date: Thu, 5 Mar 2026 18:40:31 +0530 Subject: [PATCH] docs(30-01): complete memoize container components plan Tasks completed: 2/2 - Task 1: Wrap JKSessionAudioInputs with React.memo - Task 2: Wrap JKSessionRemoteTracks with React.memo SUMMARY: .planning/phases/30-component-memoization/30-01-SUMMARY.md --- .planning/STATE.md | 18 +- .../30-component-memoization/30-01-SUMMARY.md | 175 ++++++++++++++++++ 2 files changed, 185 insertions(+), 8 deletions(-) create mode 100644 .planning/phases/30-component-memoization/30-01-SUMMARY.md diff --git a/.planning/STATE.md b/.planning/STATE.md index 4aeb58f5d..32fab9857 100644 --- a/.planning/STATE.md +++ b/.planning/STATE.md @@ -10,11 +10,11 @@ See: .planning/PROJECT.md (updated 2026-03-03) ## Current Position Phase: 30 of 32 (Component Memoization) -Plan: Not started -Status: Ready to plan -Last activity: 2026-03-05 — Completed Phase 29 Context Optimization +Plan: 1 of 2 (Memoize Container Components) +Status: In progress +Last activity: 2026-03-05 — Completed 30-01-PLAN.md -Progress: [████░░░░░░] 40% +Progress: [████░░░░░░] 42% ## Performance Metrics @@ -26,8 +26,8 @@ Progress: [████░░░░░░] 40% **v1.7 Performance Optimization (In Progress):** - Phases: 5 (phases 28-32) - Phases completed: 2 (Phases 28, 29) -- Requirements: 19 (6 complete) -- Plans completed: 3 +- Requirements: 19 (7 complete) +- Plans completed: 4 ## Accumulated Context @@ -50,6 +50,8 @@ Recent decisions (v1.7): - getMixer stabilization via useCallback prevents cascade of function recreations - 29-01 - Context value memoization only effective when hook functions are stable - 29-01 - React.memo on consumers completes the optimization chain - 29-01 +- Container component memoization completes memoization chain from Phase 29 - 30-01 +- Default shallow comparison sufficient when props are stable from upstream - 30-01 ### Investigation Findings (v1.7) @@ -93,8 +95,8 @@ Recent decisions (v1.7): ## Session Continuity Last session: 2026-03-05 -Stopped at: Completed Phase 29 Context Optimization +Stopped at: Completed 30-01-PLAN.md Resume file: None **Next steps:** -1. `/gsd:plan-phase 30` — plan Component Memoization phase +1. Continue Phase 30 Component Memoization with plan 30-02 diff --git a/.planning/phases/30-component-memoization/30-01-SUMMARY.md b/.planning/phases/30-component-memoization/30-01-SUMMARY.md new file mode 100644 index 000000000..b361edc29 --- /dev/null +++ b/.planning/phases/30-component-memoization/30-01-SUMMARY.md @@ -0,0 +1,175 @@ +--- +phase: 30-component-memoization +plan: 01 +subsystem: session-ui +tags: [react, performance, memo, re-render-optimization] +requires: + - 29-context-optimization +provides: + - memoized-container-components + - complete-memoization-chain +affects: + - 30-02 +tech-stack: + added: [] + patterns: + - React.memo for container components + - displayName for DevTools visibility +key-files: + created: [] + modified: + - jam-ui/src/components/client/JKSessionAudioInputs.js + - jam-ui/src/components/client/JKSessionRemoteTracks.js +decisions: + - key: container-component-memoization + decision: Wrap JKSessionAudioInputs and JKSessionRemoteTracks with React.memo + rationale: Completes the memoization chain from Phase 29, prevents cascade re-renders from parent + alternatives: ["PureComponent (class-based)", "manual shouldComponentUpdate"] + impact: Containers skip re-renders when props are shallowly equal + - key: default-comparison + decision: Use default shallow comparison in React.memo + rationale: Props are already stable from Phase 29 context optimization + alternatives: ["custom comparison function"] + impact: Simpler code, relies on upstream prop stability +metrics: + duration: 76 seconds + completed: 2026-03-05 +--- + +# Phase 30 Plan 01: Memoize Container Components Summary + +**One-liner:** Wrapped JKSessionAudioInputs and JKSessionRemoteTracks with React.memo to prevent unnecessary re-renders when parent re-renders with unchanged props. + +## What Was Built + +### Component Memoization +Wrapped two container components with React.memo following the Phase 29 pattern: + +1. **JKSessionAudioInputs** + - Added `memo` to React imports + - Wrapped with `memo(function JKSessionAudioInputs(...))` + - Added displayName for React DevTools visibility + - Prevents re-renders when myTracks, chat, mixerHelper, isRemote, mixType unchanged + +2. **JKSessionRemoteTracks** + - Added `memo` to React imports (alongside existing useMemo) + - Wrapped with `memo(function JKSessionRemoteTracks(...))` + - Added displayName for React DevTools visibility + - Prevents re-renders when mixerHelper and sessionModel unchanged + +### Memoization Chain +Completes the optimization chain started in Phase 29: +- **Phase 29:** Stabilized context values and hook functions with useCallback/useMemo +- **Phase 30-01:** Memoized container components that receive those stable props +- **Existing:** Child components (JKSessionMyTrack, SessionTrackVU, SessionTrackGain) already memoized + +Result: Parent re-renders no longer cascade through these components when props haven't changed. + +## Technical Decisions + +### Pattern Consistency +Used the same memo pattern established in Phase 29: +```javascript +const ComponentName = memo(function ComponentName({ props }) { + // implementation +}); +ComponentName.displayName = 'ComponentName'; +``` + +### No Custom Comparison +Did not add custom comparison functions because: +- Props are already stable from Phase 29 context optimization +- Default shallow comparison is sufficient +- Simpler code, easier to maintain +- Custom comparisons can mask upstream prop stability issues + +## Files Modified + +### jam-ui/src/components/client/JKSessionAudioInputs.js +- Added `memo` to React imports +- Wrapped component with `memo(function JKSessionAudioInputs)` +- Added displayName for DevTools +- Commit: `4dea95e85` + +### jam-ui/src/components/client/JKSessionRemoteTracks.js +- Added `memo` to React imports (with useMemo) +- Wrapped component with `memo(function JKSessionRemoteTracks)` +- Added displayName for DevTools +- Commit: `a26f75591` + +## Deviations from Plan + +None - plan executed exactly as written. + +## Testing Notes + +### Automated Verification +- Syntax checks passed for both files +- Pattern verification confirmed memo wrappers present +- displayName properties added correctly + +### Manual Verification Available +Users can verify with React DevTools: +1. Open session screen in browser +2. Open React DevTools Profiler tab +3. Record while triggering parent re-render +4. Check that JKSessionAudioInputs and JKSessionRemoteTracks show "Did not render" when props unchanged + +## Integration Points + +### Upstream Dependencies +- Relies on Phase 29 context optimization for stable props +- mixerHelper from SessionMixerContext (memoized in 29-01) +- sessionModel passed from parent (stable reference) + +### Downstream Impact +- Phase 30-02 can build on this foundation +- Future phases benefit from complete memoization chain +- Performance gains compound across optimization phases + +## Performance Impact + +### Re-render Prevention +Before: JKSessionAudioInputs and JKSessionRemoteTracks re-rendered on every parent re-render +After: Components skip re-renders when props are shallowly equal + +### Expected Benefit +- Reduces wasted renders in session screen +- Prevents unnecessary VU meter and track component updates +- Complements Phase 28 VU store and Phase 29 context optimizations + +## Next Phase Readiness + +**Ready for Phase 30-02** ✅ + +No blockers identified. Component memoization chain is complete: +- Context values stable (Phase 29) +- Container components memoized (Phase 30-01) +- Child components already memoized (previous work) + +## Lessons Learned + +### Memoization Effectiveness +React.memo only works when props are stable. Phase 29's context optimization was essential prerequisite. + +### Pattern Benefits +- Named function expressions provide better stack traces +- displayName improves debugging in React DevTools +- Consistent pattern across codebase aids comprehension + +### Dependency Chain +Performance optimizations often require coordinated changes: +1. Stabilize data sources (Phase 28: VU store) +2. Stabilize prop values (Phase 29: context memoization) +3. Prevent re-renders (Phase 30: component memoization) + +## Commits + +| Hash | Type | Description | +|-----------|----------|--------------------------------------------------| +| 4dea95e85 | refactor | wrap JKSessionAudioInputs with React.memo | +| a26f75591 | refactor | wrap JKSessionRemoteTracks with React.memo | + +**Total commits:** 2 +**Total files modified:** 2 +**Execution time:** 76 seconds