Completable empty = (completableSubscriber -> { The Completable API follows the concepts of the Reactive-Streams. Create, Lift and Transform. The Completable class has three additional standard helper interfaces, now becoming common with all RxJava. Creating a Single. Completable. Creating a Completable. Maybe. Creating a Maybe. RxCocoa traits. Driver. Why is it named Driver; Practical usage example.

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Finally, we call the evaluator’s onCompleted method to signal no more Completable s students will appear. Provides an API via a cold Completable that bridges the reactive world with the callback-style world. This blocks the subscriber’s thread so you will have to use subscribeOn.

The API client then becomes:.

Clearer RxJava intentions with Single and Completable

The first set of operators is accessible as a static method and usually deal with a set of Completable s. I have updated the answer. Returns a Completable that repeatedly subscribes to this Completable until disposed. If ccompletable Completable fails, the supplied function will receive the exception and it should return another Completable to resume with.

Advanced Reactive Java: The new Completable API (part 1)

Have you considered whether you actually need to know about those 3 events every time? Sometimes I crate to trigger a Runnable as part of my Observable sequence, but the Runnable does not report progress. Sign in Get started. Subscribes to this Completable and calls the given Action when this Completable completes normally.

With this alias, one can pre-compose common operations and present it to a stream through the usual compose method. Single is like promise in Javascript. There is no such factory method for Observablebut Completable could be made from Runnable.

This overload disposes eagerly before the terminal event is emitted. Single, Maybe and Completable are one or no emission of items. Completable contains some deferred computation with side effects and only notifies about completale success or failure of such computation. What we want is to just be notified that the update succeeded.


Returns a Completable which delays the emission of the completion event by the given time. The terminal condition is determined in the evaluator’s onCompleted method: If this Completable terminates with an onErrorthe exception is dropped and downstream receives just onCompleted. completbale

I’ll post an entire series about RxJava 2. Home Archive About Submit your article.

Regardless, let’s see a few examples. So your client code would be:. Creates a TestObserver optionally in cancelled state, then subscribes it to this Completable. The structure here starts out as with crate other Subject before.

However, RxJava lets you check it but it doesn’t really make sense to check if your upstream considers you unsubscribed or not. This small inconvenience requires you to use subscription containers whenever there is scheduling or multiple sources involved.

A promise is an object that may produce a item or throw an error. Allows preventing certain identity-based optimizations fusion. An error event from this Completable will be propagated to the downstream subscriber and will result in skipping the subscription of the Observable. Returns a Maybe which will subscribe to this Completable and once that is completed then will subscribe to the next MaybeSource.

Now that we have even more experience in writing Subject s, the next blog post will conclude the series about ConnectableObservable s. We have a set of fromXXX method which can take many sources: RxJava supports such usage with the standard DisposableCompletableObserver instance. Returns a Completable instance that fires its onComplete event after the given delay elapsed by using the supplied scheduler.

Unlike Single RxJava does not allow an Observable to be converted to a Completable directly, because there is no way to know that an Observable will ever complete. Returns a Completable instance that repeats when the Publisher returned by the handler emits an item or completes when this Publisher emits a completed event. It contains a mandatory onSubscribe call with a non-null argument followed by, optionally, either an onError with a non-null Throwable or an onCompleted.


Similarly, Throwable s signaled by source s after the returned Completable has been disposed or terminated with a composite error will be sent to the same global error handler. Since Completable doesn’t have any value, there is only one meaningful CompletableSubject implementation possible: If the Action throws an exception, the respective Throwable is delivered to the downstream via CompletableObserver.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Note that implementing custom operators via this lift method adds slightly more overhead by requiring an additional allocation and indirection per assembled flows.

Unsurprisingly, the compliant resolution is to move the creation of the teacher CompletableSubscriber into 8 without any changes to its internals; clearly, that should indicate it can be shared among the students.

Converts this Completable into a Single which when this Completable completes normally, calls the given supplier and emits its returned value through onSuccess.

We allow the principal to tell each student to stop working on the complteable. Now, our above use case can be simplified to this:. We achieve this by manually unsubscribe our BooleanSubscription 3 and calling the onCompleted method. Implementing Completable operators is easier than implementing the backpressure-supporting Observable operators, but one has to look out for proper unsubscription chaining, avoiding races between the onXXX methods and utilizing the AtomicXXX classes for the efficient state management.