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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.AMQException;
import org.apache.qpid.server.store.StoreContext;
import org.apache.log4j.Logger;
import java.util.Set;
import java.util.HashSet;
import java.util.concurrent.atomic.AtomicReference;
public class QueueEntry
{
/**
* Used for debugging purposes.
*/
private static final Logger _log = Logger.getLogger(QueueEntry.class);
private final AMQQueue _queue;
private final AMQMessage _message;
private Set<Subscription> _rejectedBy = null;
private AtomicReference<Object> _owner = new AtomicReference<Object>();
public QueueEntry(AMQQueue queue, AMQMessage message)
{
_queue = queue;
_message = message;
}
public AMQQueue getQueue()
{
return _queue;
}
public AMQMessage getMessage()
{
return _message;
}
public long getSize()
{
return getMessage().getSize();
}
public boolean getDeliveredToConsumer()
{
return getMessage().getDeliveredToConsumer();
}
public boolean expired() throws AMQException
{
return getMessage().expired(_queue);
}
public boolean isTaken()
{
return _owner.get() != null;
}
public boolean taken(Subscription sub)
{
return !(_owner.compareAndSet(null, sub == null ? this : sub));
}
public void setDeliveredToConsumer()
{
getMessage().setDeliveredToConsumer();
}
public void release()
{
_owner.set(null);
}
public String debugIdentity()
{
return getMessage().debugIdentity();
}
public void process(StoreContext storeContext, boolean deliverFirst) throws AMQException
{
_queue.process(storeContext, this, deliverFirst);
}
public void checkDeliveredToConsumer() throws NoConsumersException
{
_message.checkDeliveredToConsumer();
}
public void setRedelivered(boolean b)
{
getMessage().setRedelivered(b);
}
public Subscription getDeliveredSubscription()
{
synchronized (this)
{
Object owner = _owner.get();
if (owner instanceof Subscription)
{
return (Subscription) owner;
}
else
{
return null;
}
}
}
public void reject()
{
reject(getDeliveredSubscription());
}
public void reject(Subscription subscription)
{
if (subscription != null)
{
if (_rejectedBy == null)
{
_rejectedBy = new HashSet<Subscription>();
}
_rejectedBy.add(subscription);
}
else
{
_log.warn("Requesting rejection by null subscriber:" + debugIdentity());
}
}
public boolean isRejectedBy(Subscription subscription)
{
boolean rejected = _rejectedBy != null;
if (rejected) // We have subscriptions that rejected this message
{
return _rejectedBy.contains(subscription);
}
else // This messasge hasn't been rejected yet.
{
return rejected;
}
}
}
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