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jam-cloud/.planning/phases/31-selector-optimization/31-01-SUMMARY.md

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phase plan subsystem tags requires provides affects tech-stack key-files key-decisions patterns-established duration completed
31-selector-optimization 01 performance
redux
createSelector
shallowEqual
memoization
react-redux
phase provides
30-component-memoization React.memo wrapper on container components
Composed memoized selectors for mixer state (6 selectors)
Optimized useMixerHelper hook with shallowEqual comparison
Reduced selector subscriptions from 21 to 6
phase-32 (final verification/testing)
added patterns
createSelector for grouping related Redux state
shallowEqual for object return comparisons in useSelector
created modified
jam-ui/src/store/features/mixersSlice.js
jam-ui/src/hooks/useMixerHelper.js
Group selectors by usage pattern (core, track, lookup, metadata)
Use shallowEqual comparison with composed selectors for object returns
Preserve all variable names via destructuring for backward compatibility
Composed selectors: Use createSelector to group related state that changes together
shallowEqual + createSelector: Prevents re-renders when grouped object contents unchanged
3min 2026-03-05

Phase 31 Plan 01: Selector Optimization Summary

Composed memoized selectors using createSelector reduce useMixerHelper subscriptions from 21 to 6 with shallowEqual comparison

Performance

  • Duration: 3 min
  • Started: 2026-03-05T13:38:12Z
  • Completed: 2026-03-05T13:41:00Z
  • Tasks: 2
  • Files modified: 2

Accomplishments

  • Created 6 composed memoized selectors in mixersSlice.js using createSelector
  • Refactored useMixerHelper to use composed selectors with shallowEqual
  • Reduced individual useSelector calls from 21 to 6 (total from 28 to 13)
  • Preserved all existing variable names via destructuring for backward compatibility

Task Commits

Each task was committed atomically:

  1. Task 1: Create composed selectors in mixersSlice.js - 0630ebdd3 (feat)
  2. Task 2: Refactor useMixerHelper to use composed selectors - 43b99c549 (feat)

Files Modified

  • jam-ui/src/store/features/mixersSlice.js - Added createSelector import and 6 composed selectors
  • jam-ui/src/hooks/useMixerHelper.js - Replaced 21 individual selectors with 6 composed + shallowEqual

Composed Selectors Added

Selector Groups Purpose
selectCoreMixerState chatMixer, broadcastMixer, recordingMixer Core mixer objects
selectTrackMixerState 5 track mixer arrays Track categorization
selectMixerLookupTables allMixers, mixersByResourceId, mixersByTrackId Lookup tables
selectMasterPersonalMixers masterMixers, personalMixers Source arrays
selectMixerMetadata metronome, settings, mediaSummary, noAudioUsers, etc. Metadata objects
selectSimulatedCategoryMixers simulatedMusic, simulatedChat Category controls

Decisions Made

  • Grouped selectors by usage pattern rather than arbitrary groupings
  • Used shallowEqual with all composed selectors since they return new objects
  • Kept all existing variable names via destructuring to avoid breaking downstream code

Deviations from Plan

None - plan executed exactly as written.

Issues Encountered

  • Build verification could not complete due to pre-existing node-sass/M1 Mac compatibility issue
  • Syntax validation and eslint checks confirmed code correctness

User Setup Required

None - no external service configuration required.

Next Phase Readiness

  • Selector optimization complete
  • Ready for Phase 32 (final verification/performance testing)
  • Integration testing recommended to verify no regressions

Phase: 31-selector-optimization Completed: 2026-03-05