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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.message;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
public abstract class MessageReference<M extends ServerMessage>
{
private static final AtomicReferenceFieldUpdater<MessageReference, ServerMessage> _messageUpdater =
AtomicReferenceFieldUpdater.newUpdater(MessageReference.class, ServerMessage.class,"_message");
private volatile M _message;
public MessageReference(M message)
{
_message = message;
onReference(message);
}
abstract protected void onReference(M message);
abstract protected void onRelease(M message);
public M getMessage()
{
return _message;
}
public void release()
{
M message = (M) _messageUpdater.getAndSet(this,null);
if(message != null)
{
onRelease(message);
}
}
}
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