Limiting concurrent access to a service class with RxSwift

Question

Given a service class like this:

class Service {
    let networkService = NetworkService()

    func handleJobA(input: String) -> Observable

        

Answer 1

maybe you want concat operator,i wrote some test codes below see if this you want :

 func sleepAndPrint(label:String) -> Observable {


        return Observable.create { obser -> Disposable in
            DispatchQueue.global().async {
                sleep(3)
                print("\(label) come")
                obser.onNext(label)
                obser.onCompleted()
            }

            return Disposables.create()
        }
    }


Observable.from(["hello","world","swift"])
    // we need observable of observable sequences so just use map
    // Observable> in this case
    .map{
        sleepAndPrint(label: $0)
    }
    // Concatenates all inner observable sequences, as long as the previous observable sequence terminated successfully.
    .concat()

    .subscribe(onNext:{
        print("subscribe: " + $0)
    })
    .addDisposableTo(disposeBag)

    prints : 
      hello come
      subscribe: hello
      world come
      subscribe: world
      swift come
      subscribe: swift