Learning Reactive Programming With Java 8

Caching data with Observable.cache

We can use caching to cache the response in the memory and then, on the next subscription, instead of requesting the remote server again, to use the cached data.

Let's change the code to look like this:

String url = "https://api.github.com/orgs/ReactiveX/repos"; Observable<ObservableHttpResponse> response = request(url); System.out.println("Not yet subscribed."); Observable<String> stringResponse = response .flatMap(resp -> resp.getContent() .map(bytes -> new String(bytes))) .retry(5) .cast(String.class) .map(String::trim) .cache(); System.out.println("Subscribe 1:"); System.out.println(stringResponse.toBlocking().first()); System.out.println("Subscribe 2:"); System.out.println(stringResponse.toBlocking().first()); ...