RxJava: cancel event?

Question

Is it possible to cancel a single event in RxJava?

By that I mean something like this:

final protected PublishSubject<Object> subject = PublishSubject.create();
//...
subject.onNext(object);
//...
subject.cancel(object);

Answer 1

Short answer:

No.

Long answer:

It is not possible to cancel the event, but it is possible to unsubscribe from Observable at the right time instead:

cancelEvents = BehaviourSubject.create();

// ...

subject
    .takeUntil(cancelEvents)
    .subscribe(...)

// ...

cancelEvents.onNext(someEvent);