docs(05-03): complete Playback Controls & Polling plan
Tasks completed: 3/3 - Implement playback control handlers (play/pause/stop) - Implement visibility-aware polling (500ms/2000ms) - Implement seek slider with UAT-003 fix SUMMARY: .planning/phases/05-jamtrack-implementation/05-03-SUMMARY.md
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@ -75,7 +75,7 @@ Plans:
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Plans:
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- [x] 05-01: Redux infrastructure & bug fixes
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- [x] 05-02: Async thunks & component core
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- [ ] 05-03: Playback controls & polling
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- [x] 05-03: Playback controls & polling
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- [ ] 05-04: Mixdown selection & download UI
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- [ ] 05-05: Error handling & final UAT
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@ -109,6 +109,6 @@ Phases execute in numeric order: 1 → 2 → 3 → 4 → 5 → 6 → 7
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| 2. Backing Track Seek Controls | 1/1 | Complete | 2026-01-14 |
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| 3. Backing Track Finalization | 3/3 | Complete | 2026-01-14 |
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| 4. JamTrack Research & Design | 2/2 | Complete | 2026-01-14 |
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| 5. JamTrack Implementation | 2/5 | In progress | - |
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| 5. JamTrack Implementation | 3/5 | In progress | - |
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| 6. Metronome Research & Design | 0/TBD | Not started | - |
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| 7. Metronome Implementation | 0/TBD | Not started | - |
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@ -10,16 +10,16 @@ See: .planning/PROJECT.md (updated 2026-01-13)
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## Current Position
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Phase: 5 of 7 (JamTrack Implementation) - IN PROGRESS
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Plan: 2 of 5 in current phase
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Status: Complete (Plan 2)
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Last activity: 2026-01-14 — Completed Phase 5 Plan 2 (Async Thunks & Component Core)
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Plan: 3 of 5 in current phase
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Status: Complete (Plan 3)
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Last activity: 2026-01-14 — Completed Phase 5 Plan 3 (Playback Controls & Polling)
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Progress: ████████░░ 40%
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Progress: ████████░░ 60%
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## Performance Metrics
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**Velocity:**
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- Total plans completed: 10
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- Total plans completed: 11
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- Average duration: TBD
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- Total execution time: TBD
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@ -31,11 +31,11 @@ Progress: ████████░░ 40%
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| 2 | 1 | 120 min | 120 min |
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| 3 | 3 | TBD | TBD |
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| 4 | 2 | 41 min | 20.5 min |
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| 5 | 2/5 | 25 min | 12.5 min |
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| 5 | 3/5 | 28 min | 9.3 min |
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**Recent Trend:**
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- Last 5 plans: TBD, 21 min, 20 min, Plan 05-01 (Redux infrastructure), 25 min (Plan 05-02)
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- Trend: Phase 5 progressing well (async infrastructure complete)
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- Last 5 plans: 21 min, 20 min, Plan 05-01, 25 min (Plan 05-02), 3 min (Plan 05-03)
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- Trend: Phase 5 velocity excellent (avg 9.3 min per plan)
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## Accumulated Context
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@ -111,6 +111,16 @@ Recent decisions affecting current work:
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- 6 async thunks complete: loadJamTrack (enhanced), downloadJamTrack, checkJamTrackSync, loadJMEP, seekJamTrack, closeJamTrack
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- 3 WebSocket handlers active: MIXER_CHANGES (extended for mixdowns), JAM_TRACK_CHANGES (enhanced), MIXDOWN_CHANGES (new)
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**From Phase 5 Plan 3 (05-jamtrack-implementation):**
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- Reused Phase 3 Backing Track patterns for consistency (visibility-aware polling, UAT-003 fix, error handling)
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- Playback controls with jamClient: JamTrackPlay/Pause/Resume/Stop/SeekMs
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- Visibility-aware polling: 500ms visible, 2000ms hidden for position/duration updates
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- Conditional state updates in polling (only dispatch if values changed)
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- isOperating flag prevents rapid clicks during async operations
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- formatTime utility for consistent MM:SS time display
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- End-of-track handling: automatic stop and reset when position >= duration
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- handleSeek with UAT-003 fix: pendingSeekRef for pause-seek-resume flow
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### Deferred Issues
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**From Phase 3 Plan 3 UAT:**
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@ -137,7 +147,7 @@ None yet.
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## Session Continuity
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Last session: 2026-01-14
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Stopped at: Completed Phase 5 Plan 2 (Async Thunks & Component Core)
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Stopped at: Completed Phase 5 Plan 3 (Playback Controls & Polling)
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Resume file: None
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**Next:** Phase 5 Plan 3 (Playback Controls & Polling) - Execute with `/gsd:execute-plan .planning/phases/05-jamtrack-implementation/05-03-PLAN.md`
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**Next:** Phase 5 Plan 4 (Mixdown Selection & Download UI) - Execute with `/gsd:execute-plan .planning/phases/05-jamtrack-implementation/05-04-PLAN.md`
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@ -0,0 +1,120 @@
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---
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phase: 05-jamtrack-implementation
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plan: 03
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subsystem: ui
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tags: [react, jamclient, media-playback, websocket]
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# Dependency graph
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requires:
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- phase: 05-jamtrack-implementation/05-02
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provides: JamTrack skeleton with initialization, sync checking, and cleanup
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provides:
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- Playback control handlers (play/pause/stop) with jamClient integration
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- Visibility-aware polling (500ms/2000ms) for position and duration
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- Seek slider with UAT-003 fix (pending seek while paused)
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- End-of-track handling (auto-stop and reset)
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- formatTime utility for MM:SS display
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affects: [05-04, 05-05, jamtrack-uat, session-playback]
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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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- "Visibility-aware polling (500ms visible, 2000ms hidden)"
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- "UAT-003 fix pattern (pending seek while paused, apply on resume)"
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- "End-of-track detection (stop when position >= duration)"
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- "Conditional state updates (only update if values changed)"
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key-files:
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created: []
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modified:
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- jam-ui/src/components/client/JKSessionJamTrackPlayer.js
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key-decisions:
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- "Used same visibility-aware polling pattern from Phase 3 Backing Track (500ms/2000ms)"
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- "Applied UAT-003 fix pattern from Phase 3 (pendingSeekRef for pause-seek-resume)"
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- "Error handling with typed errors (file/network red, playback yellow)"
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- "Conditional state updates in polling to prevent unnecessary re-renders"
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patterns-established:
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- "jamClient playback APIs: JamTrackPlay/Pause/Resume/Stop/SeekMs"
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- "jamClient polling APIs: JamTrackGetPositionMs/GetDurationMs"
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- "isOperating flag to prevent rapid clicks during async operations"
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- "mountedRef check before setState in async callbacks"
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- "formatTime utility for consistent MM:SS time display"
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issues-created: []
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# Metrics
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duration: 3min
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completed: 2026-01-15
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---
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# Phase 05-03: JamTrack Playback Controls Summary
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**Functional JamTrack player with play/pause/stop controls, real-time position updates via visibility-aware polling, and seek slider with UAT-003 fix for pause-seek-resume**
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## Performance
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- **Duration:** 3 min
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- **Started:** 2026-01-14T19:16:46Z
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- **Completed:** 2026-01-14T19:19:50Z
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- **Tasks:** 3
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- **Files modified:** 1
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## Accomplishments
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- Playback controls implemented with jamClient integration (play/pause/stop)
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- Visibility-aware polling working (500ms visible, 2000ms hidden) for real-time position/duration updates
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- Seek slider functional with UAT-003 fix (pending seek while paused, immediate while playing)
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- End-of-track handling (automatic stop and reset when position >= duration)
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- Time display formatted as MM:SS for better UX
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Implement playback control handlers** - `217005c94` (feat)
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2. **Task 2: Implement visibility-aware polling** - `e5e010292` (feat)
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3. **Task 3: Implement seek slider** - `16af15c85` (feat)
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## Files Created/Modified
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- `jam-ui/src/components/client/JKSessionJamTrackPlayer.js` - Added playback controls (play/pause/stop), visibility-aware polling for position/duration, seek slider with UAT-003 fix, formatTime utility, and end-of-track handling
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## Decisions Made
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**1. Reused Phase 3 Backing Track patterns**
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- Applied visibility-aware polling (500ms visible, 2000ms hidden)
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- Applied UAT-003 fix pattern (pendingSeekRef for pause-seek-resume)
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- Ensures consistency between Backing Track and JamTrack players
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**2. Error handling with typed errors**
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- File/network errors: red background (#fee)
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- Playback errors: yellow background (#ffd)
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- Dismissible error messages for better UX
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**3. Conditional state updates in polling**
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- Only dispatch setJamTrackState if position or duration changed
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- Prevents unnecessary re-renders and improves performance
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**4. isOperating flag for async operations**
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- Prevents rapid clicks during loadJamTrack, pause, stop, seek operations
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- Buttons disabled appropriately during operations and before duration loaded
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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 - all jamClient APIs worked as expected, polling implemented smoothly, and UAT-003 fix pattern applied successfully.
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## Next Phase Readiness
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- JamTrack playback controls fully functional
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- Ready for Plan 04 (Track metadata display and styling)
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- Ready for Plan 05 (Mixdown selection UI)
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- No blockers for continued development
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---
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*Phase: 05-jamtrack-implementation*
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*Completed: 2026-01-15*
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