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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.exchange;
import org.apache.log4j.Logger;
import org.apache.qpid.framing.AMQShortString;
import org.apache.qpid.framing.FieldTable;
import org.apache.qpid.server.binding.Binding;
import org.apache.qpid.server.message.InboundMessage;
import org.apache.qpid.server.plugin.ExchangeType;
import org.apache.qpid.server.queue.AMQQueue;
import org.apache.qpid.server.queue.BaseQueue;
import java.util.ArrayList;
import java.util.concurrent.ConcurrentHashMap;
public class FanoutExchange extends AbstractExchange
{
private static final Logger _logger = Logger.getLogger(FanoutExchange.class);
private static final Integer ONE = Integer.valueOf(1);
/**
* Maps from queue name to queue instances
*/
private final ConcurrentHashMap<AMQQueue,Integer> _queues = new ConcurrentHashMap<AMQQueue,Integer>();
public static final ExchangeType<FanoutExchange> TYPE = new FanoutExchangeType();
public FanoutExchange()
{
super(TYPE);
}
public ArrayList<BaseQueue> doRoute(InboundMessage payload)
{
if (_logger.isDebugEnabled())
{
_logger.debug("Publishing message to queue " + _queues);
}
for(Binding b : getBindings())
{
b.incrementMatches();
}
return new ArrayList<BaseQueue>(_queues.keySet());
}
public boolean isBound(AMQShortString routingKey, FieldTable arguments, AMQQueue queue)
{
return isBound(routingKey, queue);
}
public boolean isBound(AMQShortString routingKey, AMQQueue queue)
{
return _queues.containsKey(queue);
}
public boolean isBound(AMQShortString routingKey)
{
return (_queues != null) && !_queues.isEmpty();
}
public boolean isBound(AMQQueue queue)
{
return _queues.containsKey(queue);
}
public boolean hasBindings()
{
return !_queues.isEmpty();
}
protected void onBind(final Binding binding)
{
AMQQueue queue = binding.getQueue();
assert queue != null;
Integer oldVal;
if((oldVal = _queues.putIfAbsent(queue, ONE)) != null)
{
Integer newVal = oldVal+1;
while(!_queues.replace(queue, oldVal, newVal))
{
oldVal = _queues.get(queue);
if(oldVal == null)
{
oldVal = _queues.putIfAbsent(queue, ONE);
if(oldVal == null)
{
break;
}
}
newVal = oldVal + 1;
}
}
if (_logger.isDebugEnabled())
{
_logger.debug("Binding queue " + queue
+ " with routing key " + new AMQShortString(binding.getBindingKey()) + " to exchange " + this);
}
}
protected void onUnbind(final Binding binding)
{
AMQQueue queue = binding.getQueue();
Integer oldValue = _queues.get(queue);
boolean done = false;
while(!(done || oldValue == null))
{
while(!(done || oldValue == null) && oldValue.intValue() == 1)
{
if(!_queues.remove(queue, oldValue))
{
oldValue = _queues.get(queue);
}
else
{
done = true;
}
}
while(!(done || oldValue == null) && oldValue.intValue() != 1)
{
Integer newValue = oldValue - 1;
if(!_queues.replace(queue, oldValue, newValue))
{
oldValue = _queues.get(queue);
}
else
{
done = true;
}
}
}
}
}
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