@Override
public void onSubscribe(Subscription s) {
if (SubscriptionHelper.validateSubscription(this.s, s)) {
return;
}
this.s = s;
Subscriber<? super U> actual = this.actual;
U b;
try {
b = bufferSupplier.get();
} catch (Throwable e) {
cancelled = true;
s.cancel();
EmptySubscription.error(e, actual);
return;
}
if (b == null) {
cancelled = true;
s.cancel();
EmptySubscription.error(new NullPointerException("The buffer supplied is null"), actual);
return;
}
buffer = b;
Publisher<B> boundary;
try {
boundary = boundarySupplier.get();
} catch (Throwable ex) {
cancelled = true;
s.cancel();
EmptySubscription.error(ex, actual);
return;
}
if (boundary == null) {
cancelled = true;
s.cancel();
EmptySubscription.error(
new NullPointerException("The boundary publisher supplied is null"), actual);
return;
}
BufferBoundarySubscriber<T, U, B> bs = new BufferBoundarySubscriber<T, U, B>(this);
other = bs;
actual.onSubscribe(this);
if (!cancelled) {
s.request(Long.MAX_VALUE);
boundary.subscribe(bs);
}
}
void next() {
Disposable o = other;
U next;
try {
next = bufferSupplier.get();
} catch (Throwable e) {
cancel();
actual.onError(e);
return;
}
if (next == null) {
cancel();
actual.onError(new NullPointerException("The buffer supplied is null"));
return;
}
Publisher<B> boundary;
try {
boundary = boundarySupplier.get();
} catch (Throwable ex) {
cancelled = true;
s.cancel();
actual.onError(ex);
return;
}
if (boundary == null) {
cancelled = true;
s.cancel();
actual.onError(new NullPointerException("The boundary publisher supplied is null"));
return;
}
BufferBoundarySubscriber<T, U, B> bs = new BufferBoundarySubscriber<T, U, B>(this);
if (!OTHER.compareAndSet(this, o, bs)) {
return;
}
U b;
synchronized (this) {
b = buffer;
if (b == null) {
return;
}
buffer = next;
}
boundary.subscribe(bs);
fastpathEmitMax(b, false, this);
}