RxJava：在onComplete中可观察

Question

I may be something very obvious here, but in the onComplete() method of an Observer, how do I get at which Observable has called onComplete?

More detail, say you have the following:

event.subscribe((e) -> {
},
(error) -> {
},
() -> {
// HERE - How do I tell what event source is completing?
}

Answer 1

'event' is an observable. Every item emitted by the observable will go through the chain of operators. After an item went through the operators it will be redirected to the subscriber, which is happening in 'subscribe'. Subscribe provides two overloades. One for each emission of the stream (event) and the second one for noticing that the 'event'-Observable (stream) has been finished.

Lets look at a List, which will be converted in an Observable. If you convert an Array to an Observable with:

Observable<Integer> integerObservable = Observable.fromArray(1, 2, 3);

you will get called for each value 1, 2, 3 onNext in the subscription. The observable will be "onComplete" after 3 has been pushed to onNext. Just look at the implementation on gitHub, to see what is happening.

Back to your question: How do I tell what event source is completing? It would be the Observable 'event', because you are subscribing to it.