@Override
public void onNext(T t) {
try {
buffer.onNext(t);
} catch (MissingBackpressureException ex) {
onError(ex);
return;
}
drain();
}
void release() {
// NO-OP for now
buffer.release();
}
public MergeItemSubscriber(int index) {
buffer = RxRingBuffer.getSpmcInstance();
this.index = index;
}
protected void drain() {
synchronized (this) {
if (emitting) {
missedEmitting++;
return;
}
emitting = true;
missedEmitting = 0;
}
final List<SourceSubscriber<T>.MergeItemSubscriber> subs = subscribers;
final Subscriber<T> child = s;
Object[] active = new Object[subs.size()];
do {
long r;
outer:
while ((r = requested) > 0) {
int idx = lastIndex;
synchronized (subs) {
if (subs.size() == active.length) {
active = subs.toArray(active);
} else {
active = subs.toArray();
}
}
int resumeIndex = 0;
int j = 0;
for (Object o : active) {
@SuppressWarnings("unchecked")
MergeItemSubscriber e = (MergeItemSubscriber) o;
if (e.index == idx) {
resumeIndex = j;
break;
}
j++;
}
int sumConsumed = 0;
for (int i = 0; i < active.length; i++) {
j = (i + resumeIndex) % active.length;
@SuppressWarnings("unchecked")
final MergeItemSubscriber e = (MergeItemSubscriber) active[j];
final RxRingBuffer b = e.buffer;
lastIndex = e.index;
if (!e.once && b.peek() == null) {
subs.remove(e);
synchronized (guard) {
this.active--;
}
csub.remove(e);
e.release();
subscribeNext();
WIP.decrementAndGet(this);
continue outer;
}
int consumed = 0;
Object v;
while (r > 0 && (v = b.poll()) != null) {
nl.accept(child, v);
if (child.isUnsubscribed()) {
return;
}
r--;
consumed++;
}
if (consumed > 0) {
sumConsumed += consumed;
REQUESTED.addAndGet(this, -consumed);
e.requestMore(consumed);
}
if (r == 0) {
break outer;
}
}
if (sumConsumed == 0) {
break;
}
}
if (active.length == 0) {
if (wip == 0) {
child.onCompleted();
return;
}
}
synchronized (this) {
if (missedEmitting == 0) {
emitting = false;
break;
}
missedEmitting = 0;
}
} while (true);
}