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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.qpid.server.queue.AMQQueue;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.CopyOnWriteArrayList;
/**
* An index of queues against routing key. Allows multiple queues to be stored
* against the same key. Used in the DestNameExchange.
*/
class Index
{
private ConcurrentMap<String, List<AMQQueue>> _index
= new ConcurrentHashMap<String, List<AMQQueue>>();
boolean add(String key, AMQQueue queue)
{
List<AMQQueue> queues = _index.get(key);
if(queues == null)
{
queues = new CopyOnWriteArrayList<AMQQueue>();
//next call is atomic, so there is no race to create the list
List<AMQQueue> active = _index.putIfAbsent(key, queues);
if(active != null)
{
//someone added the new one in faster than we did, so use theirs
queues = active;
}
}
if(queues.contains(queue))
{
return false;
}
else
{
return queues.add(queue);
}
}
boolean remove(String key, AMQQueue queue)
{
List<AMQQueue> queues = _index.get(key);
if (queues != null)
{
boolean removed = queues.remove(queue);
if (queues.size() == 0)
{
_index.remove(key);
}
return removed;
}
return false;
}
List<AMQQueue> get(String key)
{
return _index.get(key);
}
Map<String, List<AMQQueue>> getBindingsMap()
{
return _index;
}
}
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