public void testUnlinkWithIterator() {
ConcurrentLinkedDeque8<Integer> q = new ConcurrentLinkedDeque8<>();
q.add(1);
Node<Integer> n2 = q.addx(2);
Node<Integer> n3 = q.addx(3);
Node<Integer> n4 = q.addx(4);
Node<Integer> n5 = q.addx(5);
q.add(6);
Iterator<Integer> it = q.iterator();
assertTrue(it.hasNext());
assertEquals(1, it.next().intValue());
assertTrue(it.hasNext());
assertEquals(2, it.next().intValue());
assertTrue(it.hasNext());
assertEquals(3, it.next().intValue());
q.unlinkx(n2);
q.unlinkx(n3);
q.unlinkx(n4);
q.unlinkx(n5);
assertTrue(it.hasNext());
assertEquals(4, it.next().intValue());
assertTrue(it.hasNext());
assertEquals(6, it.next().intValue());
}
/**
* Method cleans up all events that either outnumber queue size or exceeds time-to-live value. It
* does none if someone else cleans up queue (lock is locked) or if there are queue readers
* (readersNum > 0).
*/
private void cleanupQueue() {
long now = U.currentTimeMillis();
long queueOversize = evts.sizex() - expireCnt;
for (int i = 0; i < queueOversize && evts.sizex() > expireCnt; i++) {
GridEvent expired = evts.poll();
if (log.isDebugEnabled()) log.debug("Event expired by count: " + expired);
}
while (true) {
ConcurrentLinkedDeque8.Node<GridEvent> node = evts.peekx();
if (node == null) // Queue is empty.
break;
GridEvent evt = node.item();
if (evt == null) // Competing with another thread.
continue;
if (now - evt.timestamp() < expireAgeMs) break;
if (evts.unlinkx(node) && log.isDebugEnabled())
log.debug("Event expired by age: " + node.item());
}
}
public void testUnlink() {
ConcurrentLinkedDeque8<Integer> deque = new ConcurrentLinkedDeque8<>();
Node<Integer> n1 = deque.addx(1);
Node<Integer> n2 = deque.addx(2);
Node<Integer> n3 = deque.addx(3);
Node<Integer> n4 = deque.addx(4);
Node<Integer> n5 = deque.addx(5);
deque.unlinkx(n2);
checkSize(deque, 4);
// Double unlinkx() call.
deque.unlinkx(n2);
checkSize(deque, 4);
Iterator<Integer> iter = deque.iterator();
boolean hasNext = iter.hasNext();
assert hasNext;
Integer next = iter.next();
assert next == 1;
iter.remove();
// Iterator should have set item to null.
assert n1.item() == null;
checkSize(deque, 3);
// Double unlinkx() call.
deque.unlinkx(n1);
checkSize(deque, 3);
deque.unlinkx(n3);
deque.unlinkx(n4);
deque.unlinkx(n5);
checkSize(deque, 0);
}
public void testUnlinkLastWithIterator() {
ConcurrentLinkedDeque8<Integer> q = new ConcurrentLinkedDeque8<>();
q.add(1);
q.addx(2);
Node<Integer> n3 = q.addx(3);
Iterator<Integer> it = q.iterator();
assertTrue(it.hasNext());
assertEquals(1, it.next().intValue());
q.unlinkx(n3);
assertTrue(it.hasNext());
assertEquals(2, it.next().intValue());
assertFalse(it.hasNext());
}