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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
package org.apache.qpid.server.queue;
import org.apache.qpid.framing.AMQShortString;
import org.apache.qpid.server.subscription.Subscription;
import org.apache.qpid.server.subscription.SubscriptionList;
import org.apache.qpid.server.virtualhost.VirtualHost;
import java.util.Map;
public class AMQPriorityQueue extends SimpleAMQQueue
{
protected AMQPriorityQueue(final AMQShortString name,
final boolean durable,
final AMQShortString owner,
final boolean autoDelete,
boolean exclusive,
final VirtualHost virtualHost,
int priorities, Map<String, Object> arguments)
{
super(name, durable, owner, autoDelete, exclusive, virtualHost,new PriorityQueueList.Factory(priorities), arguments);
}
public AMQPriorityQueue(String queueName,
boolean durable,
String owner,
boolean autoDelete,
boolean exclusive, VirtualHost virtualHost, int priorities, Map<String,Object> arguments)
{
this(queueName == null ? null : new AMQShortString(queueName), durable, owner == null ? null : new AMQShortString(owner),
autoDelete, exclusive,virtualHost, priorities, arguments);
}
public int getPriorities()
{
return ((PriorityQueueList) _entries).getPriorities();
}
@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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