Mobile Development

// Offline Sync Engine — Swift
actor SyncEngine {
    private var pendingOps: [SyncOperation] = []
    private var isSyncing = false
    
    func enqueue(_ op: SyncOperation) async {
        await LocalDB.apply(op)
        pendingOps.append(op)
        await scheduleBackgroundSync()
    }
    
    private func scheduleBackgroundSync() async {
        guard !isSyncing else { return }
        isSyncing = true
        defer { isSyncing = false }
        
        let batch = pendingOps
        let result = try? await API.sync(batch)
        if result?.success == true {
            pendingOps.removeAll()
        }
    }
}