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package org.apache.qpid.server.queue;
import java.util.Map;
import org.apache.qpid.server.subscription.Subscription;
import org.apache.qpid.server.subscription.SubscriptionList;
import org.apache.qpid.server.virtualhost.VirtualHost;
public abstract class OutOfOrderQueue extends SimpleAMQQueue
{
protected OutOfOrderQueue(String name, boolean durable, String owner,
boolean autoDelete, boolean exclusive, VirtualHost virtualHost,
QueueEntryListFactory entryListFactory, Map<String, Object> arguments)
{
super(name, durable, owner, autoDelete, exclusive, virtualHost, entryListFactory, arguments);
}
@Override
protected void checkSubscriptionsNotAheadOfDelivery(final QueueEntry entry)
{
// check that all subscriptions are not in advance of the entry
SubscriptionList.SubscriptionNodeIterator subIter = _subscriptionList.iterator();
while(subIter.advance() && !entry.isAcquired())
{
final Subscription subscription = subIter.getNode().getSubscription();
if(!subscription.isClosed())
{
QueueContext context = (QueueContext) subscription.getQueueContext();
if(context != null)
{
QueueEntry subnode = context._lastSeenEntry;
QueueEntry released = context._releasedEntry;
while(subnode != null && entry.compareTo(subnode) < 0 && !entry.isAcquired()
&& (released == null || released.compareTo(entry) > 0))
{
if(QueueContext._releasedUpdater.compareAndSet(context,released,entry))
{
break;
}
else
{
subnode = context._lastSeenEntry;
released = context._releasedEntry;
}
}
}
}
}
}
}
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