Cleanest way to dispose of Single subscriptions

Question

I'm using RxHttpClient to make requests and return Single using .firstOrError(). I then subscribe to it to get the result. In order to dispose of that subscription, I used a CompositeDisposable like in the example below.

Is there some other way to do this that doesn't require so much boilerplate? Do I need to do this at all in the current situation?

This code is in an API that needs to make a request to another API to validate some data.

single = httpClient.retrieve(HttpRequest.POST("/endpoint", request), ResultDto.class)
                    .firstOrError()
                    .subscribeOn(Schedulers.io())

CompositeDisposable cd = new CompositeDisposable();
Disposable d = single.subscribe(result -> {
                // ...
                cd.dispose();
            }, error -> {
                cd.dispose();
            });
cd.add(d);

Answer 1

Pretty much all of this is necessary, assuming you don't actually create CompositeDisposable like that and then throw it away.

You can save cd.add(d); and perhaps Disposable d= with RxJava 3 if you supply cd as the third parameter to subscribe.