yonlu
ced58fe6a9
- Add phase1Meta parameter to resolveRemainingTracks - Filter out already-resolved paths before lookupTrackMetaBatch call - Merge Phase 1 results into Phase 2 lookup map - Pass batchMeta from SetQueue call site to resolveRemainingTracks - For 1000-track queue with Phase 1 resolving 50, Phase 2 now queries 950 instead of 1000
92 lines
3.0 KiB
Markdown
92 lines
3.0 KiB
Markdown
---
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phase: 07-backend-performance
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plan: 02
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subsystem: ui
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tags: [performance, startup, deferred-loading, dom-ready, wails]
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# Dependency graph
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requires:
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- phase: 06-sql-consolidation-code-quality
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provides: stable frontend store and library data access patterns
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provides:
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- Deferred LibraryStore eagerFetch — app shell renders before backend data roundtrips
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affects: [08-frontend-polish]
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# Tech tracking
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tech-stack:
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added: []
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patterns: [deferred-initialization via DOMContentLoaded event]
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key-files:
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created: []
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modified:
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- frontend/src/store/library-store.ts
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key-decisions:
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- "DOMContentLoaded over load event — fires earlier (after HTML parsed) without waiting for all resources, still defers past module evaluation"
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patterns-established:
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- "Deferred singleton initialization: singleton constructors should not fire async work; defer to DOM ready events"
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requirements-completed: [PERF-03]
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# Metrics
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duration: 1min
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completed: 2026-03-05
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---
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# Phase 7 Plan 2: Defer Library Data Loading Summary
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**Deferred LibraryStore eagerFetch from constructor to DOMContentLoaded event, ensuring app shell renders instantly before 4 backend data roundtrips begin**
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## Performance
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- **Duration:** 1 min
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- **Started:** 2026-03-05T01:53:27Z
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- **Completed:** 2026-03-05T01:54:49Z
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- **Tasks:** 1
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- **Files modified:** 1
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## Accomplishments
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- Removed `eagerFetch()` call from LibraryStore constructor so module evaluation no longer triggers 4 backend roundtrips
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- Added `deferEagerFetch()` method that waits for `DOMContentLoaded` event (or calls immediately if DOM already parsed)
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- App shell now renders before data fetching competes for resources
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- All 4 data types (tracks, albums, artists, genres) still eagerly loaded once DOM is ready
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- Post-scan invalidation behavior unchanged — `invalidate()` still calls `eagerFetch()` directly
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Defer eagerFetch from constructor to post-DOM-ready** - `cd98ad6` (perf)
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## Files Created/Modified
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- `frontend/src/store/library-store.ts` - Removed eagerFetch from constructor, added deferEagerFetch with DOMContentLoaded listener
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## Decisions Made
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- Used `DOMContentLoaded` instead of `load` event — fires earlier (after HTML parsed, before stylesheets/images finish) which minimizes delay in data availability while still deferring past the initial module evaluation. The `load` event would unnecessarily wait for all resources before beginning data fetches.
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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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None
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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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- Plan 02 complete — deferred library loading implemented
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- Plan 01 (lazy module loading) may still be pending
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- Frontend data loading is now deferred to post-DOM-ready, providing instant app shell render
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## Self-Check: PASSED
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- [x] `frontend/src/store/library-store.ts` exists
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- [x] Commit `cd98ad6` exists in git history
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---
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*Phase: 07-backend-performance*
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*Completed: 2026-03-05*
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