To transform an Observable into a BlockingObservable, use the Observable.toBlocking( ) method or the BlockingObservable.from( ) method. Hi @alkemist,. Publish Subject. 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. I came across RxJava for android and it's a good library. The student observes the topic being taught by the professor. This function produces and returns a new Observable sequence. Similar to how toBlocking().single() and others return T this is about extracting values from an Observable to a new type asynchronously, correct?. A Blocking Observable extends the ordinary Observable class by providing a set of operators on the items emitted by the Observable that block. RxJava2 defines a whole lot of operators for various use cases of reactive programming.. timer returns an Observable that emits a single number zero after a delay period you specify. Don't use subjects. So that means that elementAt-like operators don’t wait for upstream to complete and are more like eager version of transforming Observable to Single. 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. BehaviorSubject emits the most recent item it has observed and then all subsequent observed items to each subscribed Observer. In the case of an Iterable or an Array, the resulting Observable will emit each item contained in the Iterable or Array. Observable: Assume that a professor is observable. It emits all the subsequent items of the source Observable at the time of subscription. 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. Observer: Assume that a student is an observer. Would it be correct to say that this is about "escaping the monad" in a non-blocking way? The professor teaches about some topics. RxJava implements this operator as publish.. Javadoc: publish() There is also a variant that takes a function as a parameter. In the case of an Iterable or an Array, the resulting Observable will emit each item contained in the Iterable or Array. Following is the declaration for io.reactivex.subjects.BehaviorSubject class − public final class BehaviorSubject extends Subject BehaviorSubject Example But we'll be discussing only a few operators that are commonly used for converting synchronous or asynchronous methods into Observables based on their nature.These operators take functions as arguments and emit the value returned from that function. This function takes as a parameter the ConnectableObservable that shares a single subscription to the underlying Observable sequence. ObservableElementAtSingle.java onNext. In RxJava, the from operator can convert a Future, an Iterable, or an Array. 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. RxJava implements this operator as timer. Class Declaration. 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