gistfile1.txt

class PollingManager {
    private var tasks: [UUID: Task<Double, Never>] = [:]
    
    func uploadDataAndReturnCash(for categories: [Category]) async -> Double? {
        try? await uploadDataToBackend(categories)
        for category in categories {
            let taskID = UUID()
            let task = Task.detached { [weak self] in
                return (try? await self?.pollBackend(for: category)) ?? 0.0
            }
            tasks[taskID] = task
        }
        
        return await collectResults()
    }
    
    private func collectResults() async -> Double {
        var total: Double = 0
        for (id, task) in tasks {
            let result = await task.value
            total += result
        }
        return total
    }
    
    // illustrative
    private func uploadDataToBackend(_ categories: [Category]) async throws { }
    
    func cancelAll() {
        for (_, task) in tasks {
            task.cancel()
        }
        tasks.removeAll()
    }
    
    private func pollBackend(for category: Category) async throws -> Double {
        try await Task.sleep(for: .seconds(10))
        if let cash = cash(for: category) {
            return cash
        } else {
            return try await pollBackend(for: category)
        }
    }
    
    // illustrative
    private func cash(for category: Category) -> Double? {
        return 4
    }
}