/*
*
* 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.policies;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.log4j.Logger;
import org.apache.qpid.AMQException;
import org.apache.qpid.protocol.AMQConstant;
import org.apache.qpid.server.binding.Binding;
import org.apache.qpid.server.configuration.plugins.SlowConsumerDetectionPolicyConfiguration;
import org.apache.qpid.server.configuration.plugins.ConfigurationPlugin;
import org.apache.qpid.server.exchange.TopicExchange;
import org.apache.qpid.server.logging.actors.CurrentActor;
import org.apache.qpid.server.protocol.AMQSessionModel;
import org.apache.qpid.server.queue.AMQQueue;
import org.apache.qpid.server.virtualhost.plugins.logging.TopicDeletePolicyMessages;
import org.apache.qpid.slowconsumerdetection.policies.SlowConsumerPolicyPlugin;
import org.apache.qpid.slowconsumerdetection.policies.SlowConsumerPolicyPluginFactory;
public class TopicDeletePolicy implements SlowConsumerPolicyPlugin
{
Logger _logger = Logger.getLogger(TopicDeletePolicy.class);
private TopicDeletePolicyConfiguration _configuration;
public static class TopicDeletePolicyFactory implements SlowConsumerPolicyPluginFactory
{
public TopicDeletePolicy newInstance(ConfigurationPlugin configuration) throws ConfigurationException
{
TopicDeletePolicyConfiguration config =
configuration.getConfiguration(TopicDeletePolicyConfiguration.class.getName());
TopicDeletePolicy policy = new TopicDeletePolicy();
policy.configure(config);
return policy;
}
public String getPluginName()
{
return "topicdelete";
}
public Class<TopicDeletePolicy> getPluginClass()
{
return TopicDeletePolicy.class;
}
}
public void performPolicy(AMQQueue q)
{
if (q == null)
{
return;
}
AMQSessionModel owner = q.getExclusiveOwningSession();
// Only process exclusive queues
if (owner == null)
{
return;
}
//Only process Topics
if (!validateQueueIsATopic(q))
{
return;
}
try
{
CurrentActor.get().message(owner.getLogSubject(),TopicDeletePolicyMessages.DISCONNECTING());
// Close the consumer . this will cause autoDelete Queues to be purged
owner.getConnectionModel().
closeSession(owner, AMQConstant.RESOURCE_ERROR,
"Consuming to slow.");
// Actively delete non autoDelete queues if deletePersistent is set
if (!q.isAutoDelete() && (_configuration != null && _configuration.deletePersistent()))
{
CurrentActor.get().message(q.getLogSubject(), TopicDeletePolicyMessages.DELETING_QUEUE());
q.delete();
}
}
catch (AMQException e)
{
_logger.warn("Unable to close consumer:" + owner + ", on queue:" + q.getName());
}
}
/**
* Check the queue bindings to validate the queue is bound to the
* topic exchange.
*
* @param q the Queue
*
* @return true iff Q is bound to a TopicExchange
*/
private boolean validateQueueIsATopic(AMQQueue q)
{
for (Binding binding : q.getBindings())
{
if (binding.getExchange() instanceof TopicExchange)
{
return true;
}
}
return false;
}
public void configure(ConfigurationPlugin config)
{
_configuration = (TopicDeletePolicyConfiguration) config;
}
@Override
public String toString()
{
return "TopicDelete" + (_configuration == null ? "" : "[" + _configuration + "]");
}
}