NeahNew/UNIFIED_REFRESH_SUMMARY.md

Unified Refresh System - Implementation Summary

✅ What Has Been Created

Core Infrastructure Files

1. lib/constants/refresh-intervals.ts

   • Standardized refresh intervals for all resources
   • Helper functions for interval management
   • All intervals harmonized and documented

2. lib/utils/request-deduplication.ts

   • Request deduplication utility
   • Prevents duplicate API calls within 5 seconds
   • Automatic cleanup of stale requests

3. lib/services/refresh-manager.ts

   • Centralized refresh management
   • Handles all refresh intervals
   • Provides pause/resume functionality
   • Prevents duplicate refreshes

4. hooks/use-unified-refresh.ts

   • React hook for easy integration
   • Automatic registration/cleanup
   • Manual refresh support

Documentation Files

1. IMPLEMENTATION_PLAN_UNIFIED_REFRESH.md

   • Complete architecture overview
   • Detailed implementation guide
   • Code examples for all widgets

2. IMPLEMENTATION_CHECKLIST.md

   • Step-by-step checklist
   • Daily progress tracking
   • Success criteria

---

🎯 Next Steps

Immediate Actions (Start Here)

1. Fix Critical Memory Leaks (30 minutes)

File: lib/services/notifications/notification-service.ts

Replace redis.keys() with redis.scan():

// Line 293 - BEFORE
const listKeys = await redis.keys(listKeysPattern);

// AFTER
const listKeys: string[] = [];
let cursor = '0';
do {
  const [nextCursor, keys] = await redis.scan(
    cursor, 
    'MATCH', 
    listKeysPattern, 
    'COUNT', 
    100
  );
  cursor = nextCursor;
  if (keys.length > 0) {
    listKeys.push(...keys);
  }
} while (cursor !== '0');

---

2. Test Core Infrastructure (1 hour)

Create a test file to verify everything works:

File: lib/services/__tests__/refresh-manager.test.ts (optional)

Or test manually:

1. Import refresh manager in a component
2. Register a test resource
3. Verify it refreshes at correct interval
4. Verify cleanup on unmount

---

3. Refactor Notifications (2-3 hours)

File: hooks/use-notifications.ts

Key changes:

• Remove manual polling logic
• Use useUnifiedRefresh hook
• Add requestDeduplicator for API calls
• Fix useEffect dependencies

See IMPLEMENTATION_PLAN_UNIFIED_REFRESH.md Section 3.1 for full code.

---

4. Refactor Notification Badge (1 hour)

File: components/notification-badge.tsx

Key changes:

• Remove duplicate useEffect hooks
• Use hook's refresh function for manual refresh
• Remove manual fetch logic

---

5. Refactor Navigation Bar Time (30 minutes)

File: components/main-nav.tsx + components/main-nav-time.tsx (new)

Key changes:

• Extract time display to separate component
• Use useUnifiedRefresh hook (1 second interval)
• Fix static time issue

See IMPLEMENTATION_PLAN_UNIFIED_REFRESH.md Section 3.7 for full code.

---

6. Refactor Widgets (1 hour each)

Start with high-frequency widgets:

1. Parole (components/parole.tsx) - 30s interval
2. Calendar (components/calendar.tsx) - 5min interval
3. News (components/news.tsx) - 10min interval
4. Email (components/email.tsx) - 1min interval
5. Duties (components/flow.tsx) - 2min interval

See IMPLEMENTATION_PLAN_UNIFIED_REFRESH.md Section 3.2 for example code.

---

📊 Expected Results

Before Implementation:

• ❌ 120-150 API calls/minute
• ❌ Memory leaks from uncleaned intervals
• ❌ Duplicate requests
• ❌ No coordination between widgets

After Implementation:

• ✅ 40-50 API calls/minute (60-70% reduction)
• ✅ No memory leaks
• ✅ Request deduplication working
• ✅ Centralized refresh coordination

---

🔍 Testing Checklist

After each phase, verify:

• No console errors
• Widgets refresh at correct intervals
• Manual refresh buttons work
• No duplicate API calls (check Network tab)
• No memory leaks (check Memory tab)
• Cleanup on component unmount
• Multiple tabs don't cause issues

---

🚨 Important Notes

Backward Compatibility

All new code is designed to be:

• ✅ Non-breaking (old code still works)
• ✅ Gradual migration (one widget at a time)
• ✅ Easy rollback (keep old implementations)

Migration Strategy

1. Phase 1: Core infrastructure (DONE ✅)
2. Phase 2: Fix critical issues
3. Phase 3: Migrate notifications
4. Phase 4: Migrate widgets one by one
5. Phase 5: Remove old code

Feature Flags (Optional)

If you want to toggle the new system:

// In refresh manager
const USE_UNIFIED_REFRESH = process.env.NEXT_PUBLIC_USE_UNIFIED_REFRESH !== 'false';

if (USE_UNIFIED_REFRESH) {
  // Use new system
} else {
  // Use old system
}

---

📈 Performance Monitoring

Metrics to Track

1. API Call Count

   • Before: ~120-150/min
   • Target: ~40-50/min
   • Monitor in Network tab

2. Memory Usage

   • Before: Growing over time
   • Target: Stable
   • Monitor in Memory tab

3. Refresh Accuracy

   • Verify intervals are correct
   • Check last refresh times
   • Monitor refresh manager status

Debug Tools

// Get refresh manager status
const status = refreshManager.getStatus();
console.log('Refresh Manager Status:', status);

// Get pending requests
const pendingCount = requestDeduplicator.getPendingCount();
console.log('Pending Requests:', pendingCount);

---

🎓 Learning Resources

Key Concepts

1. Singleton Pattern: Refresh manager uses singleton
2. Request Deduplication: Prevents duplicate calls
3. React Hooks: Proper cleanup with useEffect
4. Memory Management: Clearing intervals and refs

Code Patterns

• useRef for callbacks: Prevents dependency issues
• Map for tracking: Efficient resource management
• Promise tracking: Prevents duplicate requests

---

🐛 Troubleshooting

Issue: Widgets not refreshing

Check:

1. Is refresh manager started? (refreshManager.start())
2. Is resource registered? (refreshManager.getStatus())
3. Is user authenticated? (status === 'authenticated')

Issue: Duplicate API calls

Check:

1. Is request deduplication working? (requestDeduplicator.getPendingCount())
2. Are multiple components using the same resource?
3. Is TTL too short?

Issue: Memory leaks

Check:

1. Are intervals cleaned up? (check cleanup functions)
2. Are refs cleared? (isMountedRef.current = false)
3. Are pending requests cleared? (check cleanup)

---

📝 Next Session Goals

1. ✅ Core infrastructure created
2. ⏭️ Fix Redis KEYS → SCAN
3. ⏭️ Refactor notifications hook
4. ⏭️ Refactor notification badge
5. ⏭️ Refactor first widget (Parole)

---

🎉 Success!

Once all widgets are migrated:

• ✅ Unified refresh system
• ✅ 60%+ reduction in API calls
• ✅ No memory leaks
• ✅ Better user experience
• ✅ Easier maintenance

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Last Updated: Implementation Summary v1.0