NSOperation for an async code like URLSession data tasks

gistfile1.txt

class OperationSource: Operation {
    
    var state: Operation.OperationState = .inital
    
    let newsApi: NewsApi
    var data: Data?
    
    init(newsApi: NewsApi) {
        self.newsApi = newsApi
    }
    
    override var isFinished: Bool {
        state == .finished
    }
    
    override var isExecuting: Bool {
        state == .executing
    }
    
    override var isAsynchronous: Bool { true }
    
    override func start() {
        
        debugPrint("Test: OperationSources Start")
        willChangeValue(forKey: #keyPath(isExecuting))
        state = .executing
        didChangeValue(forKey: #keyPath(isExecuting))
        
        URLSession.shared.dataTask(with: URL(string: "https://httpbin.org/json")!) { (data, response, error) in
            self.willChangeValue(forKey: #keyPath(isExecuting))
            self.willChangeValue(forKey: #keyPath(isFinished))
            
            self.state = .finished
            self.data = data
            
            self.didChangeValue(forKey: #keyPath(isFinished))
            self.didChangeValue(forKey: #keyPath(isExecuting))
        }
        
    }
}