public boolean callback(final long deliveryTag, QueueEntry message) throws AMQException {
message.setRedelivered();
final Subscription subscription = message.getDeliveredSubscription();
if (subscription != null) {
// Consumer exists
if (!subscription.isClosed()) {
_msgToResend.put(deliveryTag, message);
} else // consumer has gone
{
_msgToRequeue.put(deliveryTag, message);
}
} else {
// Message has no consumer tag, so was "delivered" to a GET
// or consumer no longer registered
// cannot resend, so re-queue.
if (!message.isQueueDeleted()) {
if (_requeueIfUnabletoResend) {
_msgToRequeue.put(deliveryTag, message);
} else {
dequeueEntry(message);
_log.info("No DeadLetter Queue and requeue not requested so dropping message:" + message);
}
} else {
dequeueEntry(message);
_log.warn("Message.queue is null and no DeadLetter Queue so dropping message:" + message);
}
}
// false means continue processing
return false;
}
private void dequeueEntry(final QueueEntry node, ServerTransaction txn) {
txn.dequeue(
node.getQueue(),
node.getMessage(),
new ServerTransaction.Action() {
public void postCommit() {
node.discard();
}
public void onRollback() {}
});
}
