}
}
private PendingList doPageInForDispatch(boolean force, boolean processExpired) throws Exception {
List<QueueMessageReference> result = null;
PendingList resultList = null;
int toPageIn = Math.min(getMaxPageSize(), messages.size());
int pagedInPendingSize = 0;
pagedInPendingDispatchLock.readLock().lock();
try {
pagedInPendingSize = pagedInPendingDispatch.size();
} finally {
pagedInPendingDispatchLock.readLock().unlock();
}
LOG.debug("{} toPageIn: {}, Inflight: {}, pagedInMessages.size {}, pagedInPendingDispatch.size {}, enqueueCount: {}, dequeueCount: {}, memUsage:{}",
new Object[]{
destination.getPhysicalName(),
toPageIn,
destinationStatistics.getInflight().getCount(),
pagedInMessages.size(),
pagedInPendingSize,
destinationStatistics.getEnqueues().getCount(),
destinationStatistics.getDequeues().getCount(),
getMemoryUsage().getUsage()
});
if (isLazyDispatch() && !force) {
// Only page in the minimum number of messages which can be
// dispatched immediately.
toPageIn = Math.min(getConsumerMessageCountBeforeFull(), toPageIn);
}
if (toPageIn > 0 && (force || (!consumers.isEmpty() && pagedInPendingSize < getMaxPageSize()))) {
int count = 0;
result = new ArrayList<QueueMessageReference>(toPageIn);
messagesLock.writeLock().lock();
try {
try {
messages.setMaxBatchSize(toPageIn);
messages.reset();
while (messages.hasNext() && count < toPageIn) {
MessageReference node = messages.next();
messages.remove();
QueueMessageReference ref = createMessageReference(node.getMessage());
if (processExpired && ref.isExpired()) {
if (broker.isExpired(ref)) {
messageExpired(createConnectionContext(), ref);
} else {
ref.decrementReferenceCount();
}
} else {
result.add(ref);
count++;
}
}
} finally {
messages.release();
}
} finally {
messagesLock.writeLock().unlock();
}
// Only add new messages, not already pagedIn to avoid multiple
// dispatch attempts
pagedInMessagesLock.writeLock().lock();
try {
if(isPrioritizedMessages()) {
resultList = new PrioritizedPendingList();
} else {
resultList = new OrderedPendingList();
}
for (QueueMessageReference ref : result) {
if (!pagedInMessages.containsKey(ref.getMessageId())) {
pagedInMessages.put(ref.getMessageId(), ref);
resultList.addMessageLast(ref);
} else {
ref.decrementReferenceCount();
// store should have trapped duplicate in it's index, also cursor audit
// we need to remove the duplicate from the store in the knowledge that the original message may be inflight
// note: jdbc store will not trap unacked messages as a duplicate b/c it gives each message a unique sequence id