| /* |
| * |
| * 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); |
| } |
| } |