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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.util;
import org.apache.log4j.Logger;
import java.util.Queue;
import java.util.Collection;
import java.util.Iterator;
import java.util.concurrent.atomic.AtomicInteger;
public class ConcurrentLinkedMessageQueueAtomicSize<E> extends ConcurrentLinkedQueueAtomicSize<E> implements MessageQueue<E>
{
private static final Logger _logger = Logger.getLogger(ConcurrentLinkedMessageQueueAtomicSize.class);
protected Queue<E> _messageHead = new ConcurrentLinkedQueueAtomicSize<E>();
protected AtomicInteger _messageHeadSize = new AtomicInteger(0);
@Override
public int size()
{
return super.size() + _messageHeadSize.get();
}
@Override
public E poll()
{
if (_messageHead.isEmpty())
{
return super.poll();
}
else
{
_logger.debug("Providing item from message head");
E e = _messageHead.poll();
if (e != null)
{
_messageHeadSize.decrementAndGet();
}
return e;
}
}
@Override
public boolean remove(Object o)
{
if (_messageHead.isEmpty())
{
return super.remove(o);
}
else
{
if (_messageHead.remove(o))
{
_messageHeadSize.decrementAndGet();
return true;
}
return super.remove(o);
}
}
@Override
public boolean removeAll(Collection<?> c)
{
if (_messageHead.isEmpty())
{
return super.removeAll(c);
}
else
{
//fixme this is super.removeAll but iterator here doesn't work
// we need to be able to correctly decrement _messageHeadSize
// boolean modified = false;
// Iterator<?> e = iterator();
// while (e.hasNext())
// {
// if (c.contains(e.next()))
// {
// e.remove();
// modified = true;
// _size.decrementAndGet();
// }
// }
// return modified;
throw new RuntimeException("Not implemented");
}
}
@Override
public boolean isEmpty()
{
return (_messageHead.isEmpty() && super.isEmpty());
}
@Override
public void clear()
{
super.clear();
_messageHead.clear();
}
@Override
public boolean contains(Object o)
{
return _messageHead.contains(o) || super.contains(o);
}
@Override
public boolean containsAll(Collection<?> o)
{
return _messageHead.containsAll(o) || super.containsAll(o);
}
@Override
public E element()
{
if (_messageHead.isEmpty())
{
return super.element();
}
else
{
return _messageHead.element();
}
}
@Override
public E peek()
{
if (_messageHead.isEmpty())
{
return super.peek();
}
else
{
_logger.debug("Providing item from message head");
return _messageHead.peek();
}
}
@Override
public Iterator<E> iterator()
{
throw new RuntimeException("Not Implemented");
}
@Override
public boolean retainAll(Collection<?> c)
{
throw new RuntimeException("Not Implemented");
}
@Override
public Object[] toArray()
{
throw new RuntimeException("Not Implemented");
}
public boolean pushHead(E o)
{
_logger.debug("Adding item to head of queue");
if (_messageHead.offer(o))
{
_messageHeadSize.incrementAndGet();
return true;
}
return false;
}
}
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