public static <T> AsyncSubject<T> create() {
final SubjectSubscriptionManager<T> subscriptionManager = new SubjectSubscriptionManager<T>();
final AtomicReference<Notification<T>> lastNotification =
new AtomicReference<Notification<T>>(Notification.<T>createOnCompleted());
OnSubscribe<T> onSubscribe =
subscriptionManager.getOnSubscribeFunc(
/**
* This function executes at beginning of subscription.
*
* <p>This will always run, even if Subject is in terminal state.
*/
new Action1<SubjectObserver<? super T>>() {
@Override
public void call(SubjectObserver<? super T> o) {
// nothing to do if not terminated
}
},
/** This function executes if the Subject is terminated. */
new Action1<SubjectObserver<? super T>>() {
@Override
public void call(SubjectObserver<? super T> o) {
// we want the last value + completed so add this extra logic
// to send onCompleted if the last value is an onNext
emitValueToObserver(lastNotification.get(), o);
}
},
null);
return new AsyncSubject<T>(onSubscribe, subscriptionManager, lastNotification);
}
@Override
public void onCompleted() {
Collection<SubjectObserver<? super T>> observers =
subscriptionManager.terminate(
new Action0() {
@Override
public void call() {}
});
if (observers != null) {
for (Observer<? super T> o : observers) {
emitValueToObserver(lastNotification.get(), o);
}
}
}
@Override
public void onError(final Throwable e) {
Collection<SubjectObserver<? super T>> observers =
subscriptionManager.terminate(
new Action0() {
@Override
public void call() {
lastNotification.set(Notification.<T>createOnError(e));
}
});
if (observers != null) {
for (Observer<? super T> o : observers) {
emitValueToObserver(lastNotification.get(), o);
}
}
}
