docs(28-02): complete Wire Components to External Store plan
Tasks completed: 4/4 - Update useMixerStore to route VU data to external store - Simplify useVuHelpers and VuContext - Rewrite SessionTrackVU with direct DOM updates - Human verification (approved) Additional fix: - getLevelSnapshot now checks pendingUpdates for immediate access SUMMARY: .planning/phases/28-vu-meter-optimization/28-02-SUMMARY.md
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@ -10,11 +10,11 @@ See: .planning/PROJECT.md (updated 2026-03-03)
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## Current Position
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Phase: 28 of 32 (VU Meter Optimization)
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Plan: 01 of 03 (External VU Store Infrastructure)
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Plan: 02 of 02 (Wire Components to External Store)
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Status: In progress
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Last activity: 2026-03-03 — Completed 28-01-PLAN.md
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Last activity: 2026-03-05 — Completed 28-02-PLAN.md
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Progress: [█░░░░░░░░░] 10%
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Progress: [██░░░░░░░░] 20%
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## Performance Metrics
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@ -26,7 +26,7 @@ Progress: [█░░░░░░░░░] 10%
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**v1.7 Performance Optimization (In Progress):**
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- Phases: 5 (phases 28-32)
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- Requirements: 19
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- Plans completed: 1
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- Plans completed: 2
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## Accumulated Context
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@ -42,6 +42,10 @@ Recent decisions (v1.7):
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- Context splitting (separates high-frequency from low-frequency updates)
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- React.memo over PureComponent (functional components standard in codebase)
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- requestAnimationFrame batching (limits to 60fps, matches display refresh)
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- Route VU data directly to vuStore in bridge callback, bypassing React state - 28-02
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- Per-component RAF loops over centralized subscription system (simpler for multiple mixer IDs) - 28-02
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- React.memo on SessionTrackVU to prevent parent re-render propagation - 28-02
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- className assignment over classList.add/remove for DOM efficiency - 28-02
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### Investigation Findings (v1.7)
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@ -84,9 +88,9 @@ Recent decisions (v1.7):
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## Session Continuity
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Last session: 2026-03-03
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Stopped at: Completed 28-01-PLAN.md
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Last session: 2026-03-05
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Stopped at: Completed 28-02-PLAN.md
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Resume file: None
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**Next steps:**
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1. `/gsd:execute-plan 28-02` — Integrate VU store with native bridge and components
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1. Continue with next phase in v1.7 Performance Optimization milestone
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@ -0,0 +1,164 @@
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---
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phase: 28-vu-meter-optimization
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plan: 02
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subsystem: ui
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tags: [react, performance, vu-meters, requestAnimationFrame, direct-dom]
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# Dependency graph
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requires:
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- phase: 28-01
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provides: "External vuStore with RAF batching and useSyncExternalStore shim"
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provides:
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- "VU data routing from native bridge to external store"
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- "Direct DOM manipulation for VU meter visuals via refs"
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- "Zero React re-renders from 50-70 VU updates/second"
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affects: [future-performance-work, high-frequency-updates]
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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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- "Direct DOM manipulation via refs for high-frequency visuals"
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- "Per-component RAF loops for UI polling pattern"
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- "External store integration without Redux/Context"
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key-files:
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created: []
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modified:
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- jam-ui/src/hooks/useMixerStore.js
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- jam-ui/src/hooks/useVuHelpers.js
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- jam-ui/src/context/VuContext.js
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- jam-ui/src/components/client/SessionTrackVU.js
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- jam-ui/src/stores/vuStore.js
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key-decisions:
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- "Route VU data directly to vuStore in bridge callback, bypassing React state"
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- "Per-component RAF loops over centralized subscription system (simpler for multiple mixer IDs)"
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- "React.memo on SessionTrackVU to prevent parent re-render propagation"
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- "className assignment over classList.add/remove for DOM efficiency"
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- "Remove VU state management from useVuHelpers, keep legacy functions for backward compatibility"
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patterns-established:
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- "Direct DOM updates via refs: Store element refs, use RAF loop to poll external store, manipulate DOM directly without triggering React reconciliation"
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- "External store integration: Import store directly in components, bypass Context/Redux for high-frequency data"
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- "Bridge callback optimization: Route native events to external store instead of Redux dispatch"
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# Metrics
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duration: ~45min (across multiple sessions, including checkpoint verification)
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completed: 2026-03-05
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---
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# Phase 28 Plan 02: Wire Components to External Store Summary
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**VU meters now animate via direct DOM updates at 60fps with zero React re-renders from 50-70 updates/sec native bridge data flow**
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## Performance
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- **Duration:** ~45 minutes (across multiple sessions with checkpoint pause)
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- **Started:** 2026-03-05T08:00:00Z (approximate)
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- **Completed:** 2026-03-05T09:46:57Z
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- **Tasks:** 4 (3 auto + 1 human-verify checkpoint)
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- **Files modified:** 5
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## Accomplishments
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- **Native bridge integration:** useMixerStore now routes VU data directly to vuStore.updateLevel, bypassing Redux entirely
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- **Direct DOM rendering:** SessionTrackVU rewritten with RAF loop and ref-based DOM manipulation - no React re-renders for VU visuals
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- **Simplified state management:** useVuHelpers and VuContext no longer manage VU state, only provide store reference
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- **Zero render overhead:** React DevTools confirms no re-renders from VU updates after verification approval
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Update useMixerStore to route VU data to external store** - `96d8f97` (refactor)
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2. **Task 2: Simplify useVuHelpers and VuContext** - `f821485` (refactor)
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3. **Task 3: Rewrite SessionTrackVU with direct DOM updates** - `a020e27` (refactor)
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4. **Task 4: Human verification** - APPROVED (VU meters animating correctly after fix)
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**Additional fix during verification:**
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- **Fix: getLevelSnapshot check pendingUpdates** - `a1d24fe38` (fix)
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**Plan metadata:** (to be committed after this summary)
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## Files Created/Modified
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- `jam-ui/src/hooks/useMixerStore.js` - Routes VU data from native bridge to vuStore.updateLevel
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- `jam-ui/src/hooks/useVuHelpers.js` - Removed useState, exposes vuStore methods, kept legacy functions
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- `jam-ui/src/context/VuContext.js` - Simplified to provide vuStore reference only
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- `jam-ui/src/components/client/SessionTrackVU.js` - Complete rewrite with RAF loop and direct DOM manipulation via refs
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- `jam-ui/src/stores/vuStore.js` - Fixed getLevelSnapshot to check pendingUpdates for immediate access
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## Decisions Made
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**1. Route VU data in bridge callback**
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- **Decision:** Call vuStore.updateLevel directly in useMixerStore handleBridgeCallback
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- **Rationale:** Intercepts VU data at source, prevents Redux dispatch entirely
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- **Impact:** 50-70 updates/sec now go to external buffer instead of triggering React state updates
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**2. Per-component RAF loops over subscription**
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- **Decision:** Each SessionTrackVU runs own RAF loop polling vuStore.getLevelSnapshot
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- **Rationale:** Simpler than subscription system for multiple mixer IDs, RAF auto-pauses when tab backgrounded
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- **Impact:** Each VU meter polls at ~60fps (display refresh rate), matches browser capabilities
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**3. Direct DOM manipulation pattern**
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- **Decision:** Store light element refs, update className directly via RAF loop
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- **Rationale:** Bypasses React reconciliation entirely, proven pattern for high-frequency visuals
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- **Impact:** Zero React involvement in VU animation - confirmed via DevTools
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**4. React.memo on SessionTrackVU**
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- **Decision:** Wrap component with memo to prevent parent re-render propagation
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- **Rationale:** Even though VU updates don't trigger re-renders, parent changes (mixer config) shouldn't force re-render
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- **Impact:** Component only re-renders when mixers prop reference changes
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**5. Keep legacy functions in useVuHelpers**
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- **Decision:** Preserve createQualifiedId, renderVU, updateVU for backward compatibility
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- **Rationale:** Other components may still use these functions, minimize scope of changes
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- **Impact:** Clean migration path, no breaking changes to consumers
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## Deviations from Plan
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### Auto-fixed Issues
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**1. [Rule 1 - Bug] getLevelSnapshot not checking pendingUpdates**
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- **Found during:** Task 4 (Human verification)
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- **Issue:** VU meters not animating - getLevelSnapshot returned null for newly updated levels because it only checked flushedLevels, but RAF loop was calling it before next flush cycle
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- **Fix:** Modified getLevelSnapshot to check pendingUpdates first, then fall back to flushedLevels - provides immediate access to most recent data
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- **Files modified:** jam-ui/src/stores/vuStore.js
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- **Verification:** VU meters started animating immediately after fix
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- **Committed in:** a1d24fe38 (fix commit after verification checkpoint)
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---
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**Total deviations:** 1 auto-fixed (1 bug)
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**Impact on plan:** Critical fix for correctness - getLevelSnapshot must provide immediate access to buffered updates or RAF loop sees stale data. No scope creep, just fixing incomplete implementation from Plan 01.
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## Issues Encountered
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**VU meters not animating after initial implementation**
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- **Problem:** SessionTrackVU RAF loop called getLevelSnapshot but got null/undefined, no visual updates
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- **Root cause:** getLevelSnapshot only checked flushedLevels (updated every 16ms), but RAF loop (60fps = ~16ms) was reading between flush cycles
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- **Solution:** Updated getLevelSnapshot to check pendingUpdates buffer first - provides immediate access without waiting for next flush
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- **Outcome:** VU meters animated correctly after fix, approved by user verification
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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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**What's ready:**
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- VU meter optimization complete (requirements VU-01, VU-02, VU-03 satisfied)
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- External store pattern established for other high-frequency updates
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- Direct DOM manipulation pattern proven for React 16 performance optimization
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**Next steps:**
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- Continue with remaining plans in Phase 28 (if any)
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- Monitor VU meter performance in production for extended sessions
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- Consider applying external store pattern to other high-frequency updates (e.g., audio waveforms, real-time meters)
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**No blockers or concerns.**
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---
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*Phase: 28-vu-meter-optimization*
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*Completed: 2026-03-05*
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