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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I don’t think there are too many ways one can transform a Completable “sequence”. Single is an Observable which only emits one item comp,etable throws an error.

Clearer RxJava intentions with Single and Completable

Any copletable regular completion will just further decrement the remaining value. Calls the shared Action if a CompletableObserver subscribed to the current Completable disposes the common Disposable it received via onSubscribe. We are going to need a Scheduler. Now there is a CompletableSubject in RxJava 2.

If we really want to make sure the Subscription the child receives is actually unsubscribed, we have to add a level of indirection via a MultipleAssignmentSubscription: The Observable is observed in an unbounded backpressure mode and the unsubscription naturally composes through.

Use mergeDelayError Publisher, int to merge sources and terminate only when all source CompletableSource s creatd completed or failed with an error. Returns a Completable instance that subscribes to the given Observable, ignores all values and emits only xompletable terminal event. The documentation over at ReactiveX goes on about continuous streams of events so much that we often forget we usually only care about observing just one event that happened or just observing that something completed or failed.


Returns a Completable instance that runs the given Runnable for each subscriber and emits either its exception or simply completes.

RxJava: Single, Maybe and Completable – AndroidPub

The rules, however, allow for a much simpler version: I hope this operator setup sounds familiar, if not, here is the answer: Note that as with the Observable protocol, onError and onComplete are mutually exclusive events.

This setup has the following benefits: If both this and the other sources signal an error, only one of the errors is signaled to the downstream and the other error is signaled to the global error handler via RxJavaPlugins.

Method onNext and onComplete of Observable has been combined to onSucessas the stream has only one single item to emit. Implement this method to handle the incoming CompletableObserver s and perform the business logic in your operator. A worse scenario is that both onXXX methods may run at the same time which violates the sequential protocol of Completable.

Returns a Completable that repeatedly subscribes to this Completable so long as the given stop supplier returns false. This example should foreshadow one property of the Completable API: Returns a Completable instance that calls the given onTerminate callback after this Completable completes normally or with an exception. 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 completabpe.


The first set of operators is accessible as a static method and usually deal with a set of Completable s.

Home Archive About Submit your article. Dealing with exceptions Completable.

Clearer RxJava intentions with Single and Completable

Never miss a story from AndroidPubwhen you sign up for Medium. Otherwise, a regular onCompleted event is emitted to the principal. Note that the onFinally action is shared between subscriptions and as such should be thread-safe. For each student Completablewe “hand out” the challenge material and subscribe the teacher to the each students terminal event.


Since we don’t stop on error, we have to perform the same wip decrement as in onCompletedbut before that, the error has to be queued up. In case of a race between a terminal event and a dispose call, the provided onFinally action is executed once per subscription.

Returns a Completable instance that calls the given onTerminate callback just before this Completable completes normally or with an exception. Returns a Completable which calls the given onError callback if this Completable emits an error. The benefit of this setup is that if an operator doesn’t need resource management, no creafe structure is created such as in rx.