class NetworkOperation{
    var isAPIServerReachable : Bool {
        get{
            return reachability.isReachable
        }
    }
    private var reachability : Reachability
    private var networkOperationQueue : OperationQueue = {
        let queue = OperationQueue()
        queue.maxConcurrentOperationCount = 1
        return queue
    }()

    init() {
        self.reachability = Reachability.init(hostname: “http://myapi.com/v1/“)!
        self.reachability.reachableOnWWAN = false

        NotificationCenter.default.addObserver(
            self,
            selector: #selector(networkStatusChanged),
            name: ReachabilityChangedNotification, object: nil)
    }

    @objc
    func networkStatusChanged(){
        if self.isAPIServerReachable{
            self.networkOperationQueue.isSuspended = false
        } else {
            self.networkOperationQueue.isSuspended = true
        }
    }

    func performNetworkOperation(params: Dictionary<String,Any>,
                                 completion: @escaping ((Bool, Any?)->())){
        self.enqueueRequest(params: params, completion: completion)
    }

    func enqueueRequest(params: Dictionary<String,Any>,
                        completion: @escaping ((Bool, Any?)->())){
        let request = URL.init(string: "<<requestURL>>")!
        self.networkOperationQueue.addOperation({
            Alamofire.request(request, parameters: params).responseJSON{ response in
                switch response.result{
                    case .success(let data):
                        completion(true, data)
                    case .failure(let error):
                        completion(false, error)
                }
            }
        })
    }
}