This function takes as a parameter the ConnectableObservable that shares a single subscription to the underlying Observable sequence. RxJava implements this operator as timer. The student observes the topic being taught by the professor. Similar to how toBlocking().single() and others return T this is about extracting values from an Observable to a new type asynchronously, correct?. It emits all the subsequent items of the source Observable at the time of subscription. This function produces and returns a new Observable sequence. I'm a beginner and i understand how it works but i have some trouble converting my old codes to RxJava style programming. timer by default operates on the computation Scheduler , or you can override this by passing in a Scheduler as a final parameter. In RxJava, the from operator can convert a Future, an Iterable, or an Array. BehaviorSubject emits the most recent item it has observed and then all subsequent observed items to each subscribed Observer. Observer: Assume that a student is an observer. Hi @alkemist,. A Blocking Observable extends the ordinary Observable class by providing a set of operators on the items emitted by the Observable that block. Here instead of saving value to be emitted, we store current index called count.And when count reaches requested index we dispose upstream and complete with success downstream single. To transform an Observable into a BlockingObservable, use the Observable.toBlocking( ) method or the BlockingObservable.from( ) method. Class Declaration. RxJava2 defines a whole lot of operators for various use cases of reactive programming.. Reactive programming is a programming technique for asynchronous applications that lets you structure your code based on “reaction” to data input changes instead of an imperative programming style where you have to poll or block and wait for changes to happen.. In the case of an Iterable or an Array, the resulting Observable will emit each item contained in the Iterable or Array. Would it be correct to say that this is about "escaping the monad" in a non-blocking way? timer returns an Observable that emits a single number zero after a delay period you specify. ObservableElementAtSingle.java onNext. The professor teaches about some topics. In the case of an Iterable or an Array, the resulting Observable will emit each item contained in the Iterable or Array. Else if the scope of your observable is a type (e.g., it's exposed as a public property and backed by a field): If you need to define a similar event or a similar event already exists, then convert the event into an observable like the first case. Don't use subjects. Publish Subject. Observable: Assume that a professor is observable. val justObservable = Observable.just(4, 5, 6, null) Remember that if you pass null to Just, it will return an Observable that emits null as an item. 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