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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 java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
final class QueueContext<E extends QueueEntryImpl<E,Q,L>, Q extends SimpleAMQQueue<E,Q,L>, L extends SimpleQueueEntryList<E,Q,L>>
{
private volatile E _lastSeenEntry;
private volatile E _releasedEntry;
static final AtomicReferenceFieldUpdater<QueueContext, QueueEntryImpl>
_lastSeenUpdater =
AtomicReferenceFieldUpdater.newUpdater
(QueueContext.class, QueueEntryImpl.class, "_lastSeenEntry");
static final AtomicReferenceFieldUpdater<QueueContext, QueueEntryImpl>
_releasedUpdater =
AtomicReferenceFieldUpdater.newUpdater
(QueueContext.class, QueueEntryImpl.class, "_releasedEntry");
public QueueContext(E head)
{
_lastSeenEntry = head;
}
public E getLastSeenEntry()
{
return _lastSeenEntry;
}
E getReleasedEntry()
{
return _releasedEntry;
}
@Override
public String toString()
{
return "QueueContext{" +
"_lastSeenEntry=" + _lastSeenEntry +
", _releasedEntry=" + _releasedEntry +
'}';
}
}
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