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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 java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.atomic.AtomicInteger;
public class ConcurrentLinkedQueueAtomicSize<E> extends ConcurrentLinkedQueue<E>
{
AtomicInteger _size = new AtomicInteger(0);
public int size()
{
return _size.get();
}
public boolean offer(E o)
{
if (super.offer(o))
{
_size.incrementAndGet();
return true;
}
return false;
}
public E poll()
{
E e = super.poll();
if (e != null)
{
_size.decrementAndGet();
}
return e;
}
@Override
public boolean remove(Object o)
{
if (super.remove(o))
{
_size.decrementAndGet();
return true;
}
return false;
}
}
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