Pattern for Observables that includes acknowledgement

Question

I\'m working on something that is recording data coming from a queue. It was easy enough to process the queue into an Observable so that I can have multiple endpoints in my cod

Answer 1

Isn't this just concatMap?

// Requests are coming in a stream, with small intervals or without any.
const requests=Rx.Observable.of(2,1,16,8,16)
    .concatMap(v=>Rx.Observable.timer(1000).mapTo(v));

// Fetch, it takes some time.
function fetch(query){
  return Rx.Observable.timer(100*query)
      .mapTo('!'+query).startWith('?'+query);
}

requests.concatMap(q=>fetch(q));

https://rxviz.com/v/Mog1rmGJ

If you want to allow multiple fetches simultaneously, use mergeMap with concurrency parameter.