133 lines
4.6 KiB
Markdown
133 lines
4.6 KiB
Markdown
---
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phase: 32-state-update-optimization
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plan: 02
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subsystem: state-management
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tags: [redux, react, performance, selectors, memoization]
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# Dependency graph
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requires:
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- phase: 31-selector-optimization
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provides: Composed selectors with shallowEqual comparisons
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provides:
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- Conditional dispatch with content comparison for mixer categorization
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- mixerArraysEqual helper for ID-based array comparison
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- prevCategoriesRef to track last dispatched category values
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affects: [33-performance-testing, mixer-ui-components]
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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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- "Content comparison before Redux dispatch"
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- "useRef for tracking previous dispatch values"
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- "ID-based array equality checking"
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key-files:
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created: []
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modified:
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- jam-ui/src/hooks/useMixerHelper.js
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key-decisions:
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- "Use ref instead of selectors to track previous values (avoids circular updates)"
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- "ID-based comparison via master.id + personal.id pairs (stable and fast)"
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- "Console logs for debugging dispatch decisions (can be commented out in production)"
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patterns-established:
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- "Conditional dispatch pattern: if (!arrayEqual(prev, next)) { dispatch(); prev = next; }"
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- "Comparison by stable IDs rather than deep object comparison"
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- "Ref-based tracking for values that shouldn't trigger re-renders"
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# Metrics
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duration: 2min
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completed: 2026-03-05
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---
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# Phase 32 Plan 02: Mixer Categorization Optimization Summary
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**Conditional Redux dispatches eliminate redundant category updates - only dispatch when mixer IDs actually change**
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## Performance
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- **Duration:** 2 min
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- **Started:** 2026-03-05T14:05:42Z
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- **Completed:** 2026-03-05T14:07:07Z
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- **Tasks:** 3
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- **Files modified:** 1
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## Accomplishments
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- Added mixerArraysEqual helper for efficient ID-based array comparison
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- Implemented prevCategoriesRef to track last dispatched category values
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- Replaced unconditional dispatches with conditional checks for all 5 categories
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- Prevents unnecessary re-renders when mixer objects change but categories stay the same
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Add mixer array comparison helper** - `10a1eb657` (feat)
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- Added mixerArraysEqual function with ID-based comparison
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- Compares by master.id + personal.id pair keys
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2. **Task 2: Add prevCategoriesRef to track dispatched values** - `f7f6f10d6` (feat)
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- Added useRef with category tracking object
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- Avoids circular updates by using ref instead of selectors
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3. **Task 3: Add conditional dispatch to categorization** - `d53603cd0` (feat)
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- Wrapped all 5 category dispatches in mixerArraysEqual checks
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- Updates prevCategoriesRef after each dispatch
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- Added console logs for debugging
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## Files Created/Modified
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- `jam-ui/src/hooks/useMixerHelper.js` - Added content comparison before Redux dispatches
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## Decisions Made
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**1. Use ref instead of selectors for previous values**
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- Selectors would cause circular updates (selector reads state that dispatch updates)
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- Ref provides stable reference across renders without triggering re-renders
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- Stores last dispatched values for next comparison
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**2. ID-based comparison instead of deep equality**
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- Mixer objects have stable `id` fields
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- Deep comparison with JSON.stringify would be slow and fragile
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- Only care if the set of mixers changed, not individual properties
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- Master/personal pair creates unique identifier per mixer pair
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**3. Console logs for debugging**
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- Useful during development to verify dispatches being skipped
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- Can be commented out in production
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- Help confirm optimization is working as expected
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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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**Pre-existing ESLint warnings**
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- File has 60 pre-existing ESLint warnings (unused imports, missing dependencies)
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- Not related to this change
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- All formatting errors fixed with prettier
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- New code follows existing patterns
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## Next Phase Readiness
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**Ready for performance testing (Phase 33):**
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- Mixer categorization now only dispatches when content changes
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- Expected reduction: 5 unnecessary dispatches per mixer update
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- Can measure with Redux DevTools dispatch count before/after
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**Impact on downstream components:**
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- Any components subscribed to category selectors will re-render less frequently
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- VU meter updates won't trigger category re-categorization dispatches
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- Should reduce overall render count significantly
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**Monitoring approach:**
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- Console logs show when dispatches are skipped
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- Redux DevTools can verify dispatch reduction
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- React DevTools Profiler can measure render time improvements
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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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