@Override
public Subscription onSubscribe(Observer<? super TResult> t1) {
VirtualList<TIntermediate> values;
Throwable error;
state.lock();
try {
if (!state.done) {
state.onSubscription.call();
return state.addReplayer(t1);
}
values = state.values;
error = state.error;
} finally {
state.unlock();
}
// fully replay the subject
for (int i = values.start(); i < values.end(); i++) {
try {
t1.onNext(state.resultSelector.call(values.get(i)));
} catch (Throwable t) {
t1.onError(t);
return Subscriptions.empty();
}
}
if (error != null) {
t1.onError(error);
} else {
t1.onCompleted();
}
return Subscriptions.empty();
}
/**
* Add a replayer to the replayers and create a Subscription for it.
*
* <p>Caller should hold the lock.
*
* @param obs
* @return
*/
Subscription addReplayer(Observer<? super TResult> obs) {
Subscription s =
new Subscription() {
final AtomicBoolean once = new AtomicBoolean();
@Override
public void unsubscribe() {
if (once.compareAndSet(false, true)) {
remove(this);
}
}
@Override
public boolean isUnsubscribed() {
return once.get();
}
};
Replayer rp = new Replayer(obs, s);
replayers.put(s, rp);
rp.replayTill(values.start() + values.size());
return s;
}
