public List<MessageReference> getScheduledReferences() {
List<MessageReference> refs = new LinkedList<MessageReference>();
synchronized (scheduledReferences) {
for (RefScheduled ref : scheduledReferences) {
refs.add(ref.getRef());
}
}
return refs;
}
public int compare(RefScheduled ref1, RefScheduled ref2) {
long diff =
ref1.getRef().getScheduledDeliveryTime() - ref2.getRef().getScheduledDeliveryTime();
if (diff < 0L) {
return -1;
}
if (diff > 0L) {
return 1;
}
// Even if ref1 and ref2 have the same delivery time, we only want to return 0 if they are
// identical
if (ref1 == ref2) {
return 0;
} else {
if (ref1.isTail() && !ref2.isTail()) {
return 1;
} else if (!ref1.isTail() && ref2.isTail()) {
return -1;
}
if (!ref1.isTail() && !ref2.isTail()) {
return -1;
} else {
return 1;
}
}
}