@Override
public void onNext(Notification<? extends T> args) {
if (waiting.getAndSet(false) || !args.isOnNext()) {
Notification<? extends T> toOffer = args;
while (!buf.offer(toOffer)) {
Notification<? extends T> concurrentItem = buf.poll();
// in case if we won race condition with onComplete/onError method
if (concurrentItem != null && !concurrentItem.isOnNext()) {
toOffer = concurrentItem;
}
}
}
}
private boolean moveToNext() {
try {
Notification<? extends T> nextNotification = observer.takeNext();
if (nextNotification.isOnNext()) {
isNextConsumed = false;
next = nextNotification.getValue();
return true;
}
// If an observable is completed or fails,
// hasNext() always return false.
hasNext = false;
if (nextNotification.isOnCompleted()) {
return false;
}
if (nextNotification.isOnError()) {
error = nextNotification.getThrowable();
throw Exceptions.propagate(error);
}
throw new IllegalStateException("Should not reach here");
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
error = e;
throw Exceptions.propagate(error);
}
}
protected static <T> void emitValueToObserver(Notification<T> n, Observer<? super T> o) {
n.accept(o);
if (n.isOnNext()) {
o.onCompleted();
}
}