offline-sync-engine
Handles offline data synchronization with conflict resolution and progressive sync.
ソース情報
- リポジトリ
- Fadil369/Solutions
- ソースの最終更新活動
- 2026年4月9日 00:36
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SKILL.md
ソースの指示 · 読み取り専用プレビュー- name
- Offline Sync Engine
- version
- 1.0.0
- description
- Handles offline data synchronization with conflict resolution and progressive sync.
- author
- workspace
- activated
- false
# Offline Sync Engine
## Overview
Manages offline data storage and synchronization when connectivity returns.
## Decision Framework
### When to use
- App needs to work without internet
- Data must sync across devices
- Users edit data while offline
### When NOT to use
- Real-time collaborative systems
- Read-only data displays
## Trigger Phrases
- "Work offline"
- "Sync data when back online"
- "Offline support"
- "Cache data locally"
## Sync Patterns
| Pattern | Conflict Strategy | Best For |
|---------|-------------------|----------|
| Last-write-wins | Timestamp comparison | Simple data |
| Operational transform | Transform operations | Collaborative text |
| CRDT | Merge all changes | Distributed systems |
| Manual merge | User resolves | Critical data |
## Storage Layers
```
┌─────────────────────────────────────┐
│ Application Layer │
├─────────────────────────────────────┤
│ Sync Queue (pending changes) │
├─────────────────────────────────────┤
│ Local Cache (IndexedDB/SQLite) │
├─────────────────────────────────────┤
│ Conflict Resolution │
├─────────────────────────────────────┤
│ Remote API │
└─────────────────────────────────────┘
```
## Implementation
### Sync Queue
```javascript
class SyncQueue {
constructor() {
this.pending = [];
this.failed = [];
}
add(change) {
this.pending.push({
id: generateId(),
operation: change.operation,
data: change.data,
timestamp: Date.now(),
retries: 0
});
}
async flush() {
while (this.pending.length > 0) {
const change = this.pending[0];
try {
await this.sendToServer(change);
this.pending.shift();
} catch (error) {
change.retries++;
if (change.retries >= 3) {
this.failed.push(this.pending.shift());
}
break;
}
}
}
}
```
### Conflict Resolution
```javascript
class ConflictResolver {
resolve(local, remote, strategy = 'last-write-wins') {
switch(strategy) {
case 'last-write-wins':
return local.updatedAt > remote.updatedAt ? local : remote;
case 'merge':
return this.deepMerge(local, remote);
case 'manual':
throw new ConflictError(local, remote);
}
}
}
```
## Escalation Chain
1. **Retry** - Immediate retry (3 attempts)
2. **Backoff** - Exponential backoff (1s, 2s, 4s, 8s)
3. **Queue** - Add to offline queue for later sync
4. **Notify** - Alert user of sync failure
5. **Manual** - User intervention required
## Error Classification
| Error Type | Strategy | Recovery |
|-----------|----------|----------|
| Network timeout | Retry with backoff | Auto |
| Conflict | Merge strategy | Auto/Manual |
| Auth expired | Refresh token | Auto |
| Data corruption | Rollback + alert | Manual |
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