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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.handler;
import java.text.MessageFormat;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.log4j.Logger;
import org.apache.qpid.AMQException;
import org.apache.qpid.configuration.Configured;
import org.apache.qpid.exchange.ExchangeDefaults;
import org.apache.qpid.framing.AMQFrame;
import org.apache.qpid.framing.AMQShortString;
import org.apache.qpid.framing.QueueDeclareBody;
import org.apache.qpid.framing.QueueDeclareOkBody;
import org.apache.qpid.protocol.AMQConstant;
import org.apache.qpid.protocol.AMQMethodEvent;
import org.apache.qpid.server.configuration.Configurator;
import org.apache.qpid.server.exchange.Exchange;
import org.apache.qpid.server.exchange.ExchangeRegistry;
import org.apache.qpid.server.protocol.AMQProtocolSession;
import org.apache.qpid.server.queue.AMQQueue;
import org.apache.qpid.server.queue.QueueRegistry;
import org.apache.qpid.server.state.AMQStateManager;
import org.apache.qpid.server.state.StateAwareMethodListener;
import org.apache.qpid.server.store.MessageStore;
import org.apache.qpid.server.virtualhost.VirtualHost;
import org.apache.qpid.server.AMQChannel;
public class QueueDeclareHandler implements StateAwareMethodListener<QueueDeclareBody>
{
private static final Logger _log = Logger.getLogger(QueueDeclareHandler.class);
private static final QueueDeclareHandler _instance = new QueueDeclareHandler();
public static QueueDeclareHandler getInstance()
{
return _instance;
}
@Configured(path = "queue.auto_register", defaultValue = "false")
public boolean autoRegister;
private final AtomicInteger _counter = new AtomicInteger();
protected QueueDeclareHandler()
{
Configurator.configure(this);
}
public void methodReceived(AMQStateManager stateManager, AMQMethodEvent<QueueDeclareBody> evt) throws AMQException
{
AMQProtocolSession session = stateManager.getProtocolSession();
VirtualHost virtualHost = session.getVirtualHost();
ExchangeRegistry exchangeRegistry = virtualHost.getExchangeRegistry();
QueueRegistry queueRegistry = virtualHost.getQueueRegistry();
MessageStore store = virtualHost.getMessageStore();
QueueDeclareBody body = evt.getMethod();
// if we aren't given a queue name, we create one which we return to the client
if (body.queue == null)
{
body.queue = createName();
}
AMQQueue queue;
//TODO: do we need to check that the queue already exists with exactly the same "configuration"?
synchronized (queueRegistry)
{
if (((queue = queueRegistry.getQueue(body.queue)) == null) )
{
if(body.passive)
{
String msg = "Queue: " + body.queue + " not found.";
throw body.getChannelException(AMQConstant.NOT_FOUND,msg );
}
else
{
queue = createQueue(body, virtualHost, session);
if (queue.isDurable() && !queue.isAutoDelete())
{
store.createQueue(queue);
}
queueRegistry.registerQueue(queue);
if (autoRegister)
{
Exchange defaultExchange = exchangeRegistry.getDefaultExchange();
defaultExchange.registerQueue(body.queue, queue, null);
queue.bind(body.queue, defaultExchange);
_log.info("Queue " + body.queue + " bound to default exchange");
}
}
}
else if(queue.getOwner() != null && !session.getContextKey().equals(queue.getOwner()))
{
throw body.getChannelException(AMQConstant.ALREADY_EXISTS, "Cannot declare queue, as exclusive queue with same name declared on another connection");
}
AMQChannel channel = session.getChannel(evt.getChannelId());
if (channel == null)
{
throw body.getChannelNotFoundException(evt.getChannelId());
}
//set this as the default queue on the channel:
channel.setDefaultQueue(queue);
}
if (!body.nowait)
{
// AMQP version change: Hardwire the version to 0-8 (major=8, minor=0)
// TODO: Connect this to the session version obtained from ProtocolInitiation for this session.
// Be aware of possible changes to parameter order as versions change.
AMQFrame response = QueueDeclareOkBody.createAMQFrame(evt.getChannelId(),
(byte)8, (byte)0, // AMQP version (major, minor)
queue.getConsumerCount(), // consumerCount
queue.getMessageCount(), // messageCount
body.queue); // queue
_log.info("Queue " + body.queue + " declared successfully");
session.writeFrame(response);
}
}
protected AMQShortString createName()
{
return new AMQShortString("tmp_" + pad(_counter.incrementAndGet()));
}
protected static String pad(int value)
{
return MessageFormat.format("{0,number,0000000000000}", value);
}
protected AMQQueue createQueue(QueueDeclareBody body, VirtualHost virtualHost, final AMQProtocolSession session)
throws AMQException
{
final QueueRegistry registry = virtualHost.getQueueRegistry();
AMQShortString owner = body.exclusive ? session.getContextKey() : null;
final AMQQueue queue = new AMQQueue(body.queue, body.durable, owner, body.autoDelete, virtualHost);
final AMQShortString queueName = queue.getName();
if(body.exclusive && !body.durable)
{
final AMQProtocolSession.Task deleteQueueTask =
new AMQProtocolSession.Task()
{
public void doTask(AMQProtocolSession session) throws AMQException
{
if(registry.getQueue(queueName) == queue)
{
queue.delete();
}
}
};
session.addSessionCloseTask(deleteQueueTask);
queue.addQueueDeleteTask(new AMQQueue.Task()
{
public void doTask(AMQQueue queue)
{
session.removeSessionCloseTask(deleteQueueTask);
}
});
}
return queue;
}
}
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