docs(22): complete Session Screen Fixes phase
Phase 22 verified: 3/3 must-haves passed (SESS-01, SESS-02, SESS-03) - SESS-01: Callback cleanup hardened with useRef pattern - SESS-02: Polling intervals verified OK (Phase 19) - SESS-03: Event listeners verified OK (Phase 19) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Nuwan
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@ -21,9 +21,9 @@ Requirements for fixing memory leaks in the session screen. Focus on cleanup pat
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### Session Screen Base (SESS)
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- [ ] **SESS-01**: Audit useEffect hooks for missing cleanup return functions
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- [ ] **SESS-02**: Check polling intervals for proper cleanup on component unmount
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- [ ] **SESS-03**: Audit event listener registration/removal patterns
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- [x] **SESS-01**: Audit useEffect hooks for missing cleanup return functions
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- [x] **SESS-02**: Check polling intervals for proper cleanup on component unmount (verified OK in Phase 19)
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- [x] **SESS-03**: Audit event listener registration/removal patterns (verified OK in Phase 19)
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### Verification (VRFY)
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@ -49,9 +49,9 @@ Requirements for fixing memory leaks in the session screen. Focus on cleanup pat
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| CHAT-01 | Phase 21 | Complete (verified in Phase 19) |
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| CHAT-02 | Phase 21 | Complete |
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| CHAT-03 | Phase 21 | Complete |
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| SESS-01 | Phase 22 | Pending |
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| SESS-02 | Phase 22 | Pending |
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| SESS-03 | Phase 22 | Pending |
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| SESS-01 | Phase 22 | Complete |
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| SESS-02 | Phase 22 | Complete |
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| SESS-03 | Phase 22 | Complete |
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| VRFY-01 | Phase 23 | Pending |
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| VRFY-02 | Phase 23 | Pending |
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@ -86,8 +86,8 @@ Decimal phases appear between their surrounding integers in numeric order.
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- [x] **Phase 19: Audit and Discovery** - Investigate all three areas, identify actual memory leaks with evidence
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- [x] **Phase 20: VU Meter Fixes** - Fix identified VU meter interval/animation cleanup issues
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- [ ] **Phase 21: Chat Window Fixes** - Fix identified chat WebSocket listener and state cleanup issues
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- [ ] **Phase 22: Session Screen Fixes** - Fix identified session screen useEffect and polling cleanup issues
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- [x] **Phase 21: Chat Window Fixes** - Fix identified chat WebSocket listener and state cleanup issues
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- [x] **Phase 22: Session Screen Fixes** - Fix identified session screen useEffect and polling cleanup issues
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- [ ] **Phase 23: Verification** - Validate session stability after fixes
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## Phase Details
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@ -448,7 +448,7 @@ Plans:
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5. No orphaned polling or listeners accumulate during normal session use
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Plans:
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- [ ] 22-01-PLAN.md - Callback cleanup hardening with useRef pattern (SESS-01)
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- [x] 22-01-PLAN.md - Callback cleanup hardening with useRef pattern (SESS-01) - COMPLETE 2026-02-08
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#### Phase 23: Verification
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**Goal**: Validate session stability after all fixes are applied
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@ -496,5 +496,5 @@ Phases execute in numeric order: 1 → 2 → ... → 18 → 19 → 20 → 21 →
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| 19. Audit and Discovery | v1.4 | 1/1 | Complete | 2026-02-08 |
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| 20. VU Meter Fixes | v1.4 | 1/1 | Complete | 2026-02-08 |
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| 21. Chat Window Fixes | v1.4 | 1/1 | Complete | 2026-02-08 |
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| 22. Session Screen Fixes | v1.4 | 0/TBD | Not started | - |
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| 22. Session Screen Fixes | v1.4 | 1/1 | Complete | 2026-02-08 |
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| 23. Verification | v1.4 | 0/TBD | Not started | - |
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@ -14,7 +14,7 @@ Plan: 01 of 01 - Complete
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Status: Phase complete
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Last activity: 2026-02-08 - Completed 22-01-PLAN.md (Session Callback Cleanup)
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Progress (v1.4): [████████████░░░░░░░░] 60%
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Progress (v1.4): [████████████████░░░░] 80%
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## Performance Metrics
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@ -0,0 +1,90 @@
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---
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phase: 22-session-screen-fixes
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verified: 2026-02-08T17:30:00Z
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status: passed
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score: 3/3 must-haves verified
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---
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# Phase 22: Session Screen Fixes Verification Report
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**Phase Goal:** Fix identified session screen useEffect and polling cleanup issues
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**Verified:** 2026-02-08T17:30:00Z
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**Status:** passed
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**Re-verification:** No - initial verification
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## Goal Achievement
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### Observable Truths
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| # | Truth | Status | Evidence |
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|---|-------|--------|----------|
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| 1 | Session screen cleanup runs on component unmount regardless of leave handler execution | VERIFIED | useEffect cleanup at line 940-957 calls `unregisterMessageCallbacks()` which uses `registeredCallbacksRef.current` |
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| 2 | Callback registration uses refs to ensure cleanup always has access to current callbacks | VERIFIED | `registeredCallbacksRef` declared at line 294, used in `unregisterMessageCallbacks` at line 299 |
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| 3 | Session can be exited via any path (leave button, navigation, browser close) without leaking callbacks | VERIFIED | Three exit paths covered: (1) Leave button calls `unregisterMessageCallbacks()` at line 899, (2) Navigation/unmount triggers cleanup useEffect return at line 941-943, (3) Browser close handled by server-side connection cleanup |
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**Score:** 3/3 truths verified
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### Required Artifacts
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| Artifact | Expected | Status | Details |
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|----------|----------|--------|---------|
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| `jam-ui/src/components/client/JKSessionScreen.js` | Improved callback cleanup with useRef | VERIFIED | `registeredCallbacksRef` at line 294, used in `unregisterMessageCallbacks()` at line 299, registration stores to both state and ref at lines 633-634 |
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### Key Link Verification
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| From | To | Via | Status | Details |
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|------|-----|-----|--------|---------|
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| JKSessionScreen cleanup useEffect | unregisterMessageCallback | registeredCallbacksRef.current | WIRED | Line 299: `const callbacks = registeredCallbacksRef.current;` followed by iteration and unregistration at lines 300-301 |
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| Callback registration | Both state and ref | setRegisteredCallbacks + ref assignment | WIRED | Lines 633-634: `setRegisteredCallbacks(callbacksToRegister);` and `registeredCallbacksRef.current = callbacksToRegister;` |
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| Leave handler | unregisterMessageCallbacks | Direct call | WIRED | Line 899: `unregisterMessageCallbacks();` called before leaving session |
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### Requirements Coverage
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| Requirement | Status | Notes |
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|-------------|--------|-------|
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| SESS-01 | SATISFIED | useRef pattern implemented for reliable callback cleanup on all exit paths |
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| SESS-02 | SATISFIED | Phase 19 audit verified useJamServer.js, useSessionStats.js timers already have proper cleanup |
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| SESS-03 | SATISFIED | Phase 19 audit verified useJamServer.js event listeners already have proper cleanup |
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### Anti-Patterns Found
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| File | Line | Pattern | Severity | Impact |
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|------|------|---------|----------|--------|
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| None found | - | - | - | No stub patterns, TODOs, or placeholder content in modified code |
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### Human Verification Required
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None required - all verification criteria can be confirmed through static code analysis.
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### Success Criteria Verification
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From ROADMAP.md:
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| # | Criterion | Status | Evidence |
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|---|-----------|--------|----------|
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| 1 | All useEffect hooks that set up subscriptions/intervals have cleanup return functions | VERIFIED | JKSessionScreen.js cleanup useEffect at line 940-957; useJamServer.js, useSessionStats.js, useSessionModel.js all have proper cleanup (per Phase 19 audit) |
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| 2 | All polling intervals are cleared on component unmount | VERIFIED | useSessionStats.js line 153 `return () => clearInterval(interval);`; useJamServer.js has comprehensive timer cleanup |
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| 3 | All event listeners have corresponding removal on cleanup | VERIFIED | useJamServer.js lines 644-651 removes activity event listeners; no new listeners added |
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| 4 | Session screen can be mounted/unmounted without memory growth | VERIFIED (code) | Cleanup patterns ensure callbacks and state are cleared; full runtime verification deferred to Phase 23 |
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| 5 | No orphaned polling or listeners accumulate during normal session use | VERIFIED (code) | All timer and listener patterns reviewed; no accumulation patterns found |
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### Summary
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Phase 22 goal achieved. The session screen callback cleanup has been hardened with the useRef pattern to ensure reliable cleanup on all exit paths:
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1. **SESS-01 addressed:** Added `registeredCallbacksRef` alongside `registeredCallbacks` state. The `unregisterMessageCallbacks` function now reads from the ref rather than state, avoiding stale closure issues when the component unmounts unexpectedly.
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2. **SESS-02 confirmed satisfied:** Phase 19 audit verified that useJamServer.js, useSessionStats.js, and useSessionModel.js all have proper timer cleanup patterns. No code changes required.
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3. **SESS-03 confirmed satisfied:** Phase 19 audit verified that event listener patterns in useJamServer.js have proper cleanup. No code changes required.
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The implementation follows best practices:
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- useRef for stable reference across renders
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- Both state (for reactivity) and ref (for cleanup) updated on registration
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- Cleanup function uses ref to guarantee access to current callbacks
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- Multiple exit paths (leave button, navigation, unmount) all trigger cleanup
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---
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*Verified: 2026-02-08T17:30:00Z*
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*Verifier: Claude (gsd-verifier)*
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