public void forEachRemaining(Consumer<? super E> action) {
Node<E> p;
if (action == null) throw new NullPointerException();
final ConcurrentLinkedQueue<E> q = this.queue;
if (!exhausted && ((p = current) != null || (p = q.first()) != null)) {
exhausted = true;
do {
E e = p.item;
if (p == (p = p.next)) p = q.first();
if (e != null) action.accept(e);
} while (p != null);
}
}
public boolean tryAdvance(Consumer<? super E> action) {
Node<E> p;
if (action == null) throw new NullPointerException();
final ConcurrentLinkedQueue<E> q = this.queue;
if (!exhausted && ((p = current) != null || (p = q.first()) != null)) {
E e;
do {
e = p.item;
if (p == (p = p.next)) p = q.first();
} while (e == null && p != null);
if ((current = p) == null) exhausted = true;
if (e != null) {
action.accept(e);
return true;
}
}
return false;
}
public Spliterator<E> trySplit() {
Node<E> p;
final ConcurrentLinkedQueue<E> q = this.queue;
int b = batch;
int n = (b <= 0) ? 1 : (b >= MAX_BATCH) ? MAX_BATCH : b + 1;
if (!exhausted && ((p = current) != null || (p = q.first()) != null) && p.next != null) {
Object[] a = new Object[n];
int i = 0;
do {
if ((a[i] = p.item) != null) ++i;
if (p == (p = p.next)) p = q.first();
} while (p != null && i < n);
if ((current = p) == null) exhausted = true;
if (i > 0) {
batch = i;
return Spliterators.spliterator(
a, 0, i, Spliterator.ORDERED | Spliterator.NONNULL | Spliterator.CONCURRENT);
}
}
return null;
}