@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); }