Manage identical requests with RxJava

Question

Assume that I have a fetcher that fetches an image from a given link on a separate thread. The image will then be cached in memory. Once the image already gets cached, the f

Answer 1

Have a look at ConnectableObservable and the .replay() method.

I'm currently using this is my fragments to handle orientation changes:

Fragment's onCreate:

ConnectableObservable connectableObservable = 
    retrofitService.fetchMyThing()
        .map(...)
        .replay();

connectableObservable.connect(); // this starts the actual network call

Fragment's onCreateView:

Subscription subscription = connectableObservable
    .observeOn(AndroidSchedulers.mainThread())
    .subscribe(mything -> dosomething());

What happens is that I make 1 network request only, and any subscriber will (eventually/immediately) get that response.