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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.virtualhost.plugins;
import org.apache.log4j.Logger;
import org.apache.qpid.server.binding.Binding;
import org.apache.qpid.server.configuration.plugins.SlowConsumerDetectionQueueConfiguration;
import org.apache.qpid.server.exchange.Exchange;
import org.apache.qpid.server.exchange.Exchange.BindingListener;
import org.apache.qpid.server.queue.AMQQueue;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
/**
* This is a listener that caches queues that are configured for slow consumer disconnection.
*
* There should be one listener per virtual host, which can be added to all exchanges on
* that host.
*
* TODO In future, it will be possible to configure the policy at runtime, so only the queue
* itself is cached, and the configuration looked up by the housekeeping thread. This means
* that there may be occasions where the copy of the cache contents retrieved by the thread
* does not contain queues that are configured, or that configured queues are not present.
*
* @see BindingListener
*/
public class ConfiguredQueueBindingListener implements BindingListener
{
private static final Logger _log = Logger.getLogger(ConfiguredQueueBindingListener.class);
private String _vhostName;
private Set<AMQQueue> _cache = Collections.synchronizedSet(new HashSet<AMQQueue>());
public ConfiguredQueueBindingListener(String vhostName)
{
_vhostName = vhostName;
}
/**
* @see BindingListener#bindingAdded(Exchange, Binding)
*/
public void bindingAdded(Exchange exchange, Binding binding)
{
processBinding(binding);
}
/**
* @see BindingListener#bindingRemoved(Exchange, Binding)
*/
public void bindingRemoved(Exchange exchange, Binding binding)
{
processBinding(binding);
}
private void processBinding(Binding binding)
{
AMQQueue queue = binding.getQueue();
SlowConsumerDetectionQueueConfiguration config =
queue.getConfiguration().getConfiguration(SlowConsumerDetectionQueueConfiguration.class.getName());
if (config != null)
{
_cache.add(queue);
}
else
{
_cache.remove(queue);
}
}
/**
* Lookup and return the cache of configured {@link AMQQueue}s.
*
* Note that when accessing the cached queues, the {@link java.util.Iterator} is not thread safe
* (see the {@link Collections#synchronizedSet(Set)} documentation) so a copy of the
* cache is returned.
*
* @return a copy of the cached {@link java.util.Set} of queues
*/
public Set<AMQQueue> getQueueCache()
{
return new HashSet<AMQQueue>(_cache);
}
}
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