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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
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package org.apache.qpid.server.protocol.v0_8.handler;
import org.apache.log4j.Logger;
import org.apache.qpid.AMQConnectionException;
import org.apache.qpid.AMQException;
import org.apache.qpid.server.exchange.AMQUnknownExchangeType;
import org.apache.qpid.framing.AMQMethodBody;
import org.apache.qpid.framing.AMQShortString;
import org.apache.qpid.framing.ExchangeDeclareBody;
import org.apache.qpid.framing.MethodRegistry;
import org.apache.qpid.protocol.AMQConstant;
import org.apache.qpid.server.exchange.DirectExchange;
import org.apache.qpid.server.exchange.ExchangeImpl;
import org.apache.qpid.server.model.LifetimePolicy;
import org.apache.qpid.server.protocol.v0_8.AMQChannel;
import org.apache.qpid.server.protocol.v0_8.AMQProtocolSession;
import org.apache.qpid.server.protocol.v0_8.state.AMQStateManager;
import org.apache.qpid.server.protocol.v0_8.state.StateAwareMethodListener;
import org.apache.qpid.server.virtualhost.ExchangeExistsException;
import org.apache.qpid.server.virtualhost.ReservedExchangeNameException;
import org.apache.qpid.server.virtualhost.UnknownExchangeException;
import org.apache.qpid.server.virtualhost.VirtualHost;
import java.security.AccessControlException;
import java.util.HashMap;
import java.util.Map;
public class ExchangeDeclareHandler implements StateAwareMethodListener<ExchangeDeclareBody>
{
private static final Logger _logger = Logger.getLogger(ExchangeDeclareHandler.class);
private static final ExchangeDeclareHandler _instance = new ExchangeDeclareHandler();
public static ExchangeDeclareHandler getInstance()
{
return _instance;
}
private ExchangeDeclareHandler()
{
}
public void methodReceived(AMQStateManager stateManager, ExchangeDeclareBody body, int channelId) throws AMQException
{
AMQProtocolSession session = stateManager.getProtocolSession();
VirtualHost virtualHost = session.getVirtualHost();
final AMQChannel channel = session.getChannel(channelId);
if (channel == null)
{
throw body.getChannelNotFoundException(channelId);
}
final AMQShortString exchangeName = body.getExchange();
if (_logger.isDebugEnabled())
{
_logger.debug("Request to declare exchange of type " + body.getType() + " with name " + exchangeName);
}
ExchangeImpl exchange;
if(isDefaultExchange(exchangeName))
{
if(!new AMQShortString(DirectExchange.TYPE.getType()).equals(body.getType()))
{
throw new AMQConnectionException(AMQConstant.NOT_ALLOWED, "Attempt to redeclare default exchange: "
+ " of type "
+ DirectExchange.TYPE.getType()
+ " to " + body.getType() +".",
body.getClazz(), body.getMethod(),
body.getMajor(), body.getMinor(),null);
}
}
else
{
if (body.getPassive())
{
exchange = virtualHost.getExchange(exchangeName.toString());
if(exchange == null)
{
throw body.getChannelException(AMQConstant.NOT_FOUND, "Unknown exchange: " + exchangeName);
}
else if (!(body.getType() == null || body.getType().length() ==0) && !exchange.getTypeName().equals(body.getType().asString()))
{
throw new AMQConnectionException(AMQConstant.NOT_ALLOWED, "Attempt to redeclare exchange: " +
exchangeName + " of type " + exchange.getTypeName()
+ " to " + body.getType() +".",body.getClazz(), body.getMethod(),body.getMajor(),body.getMinor(),null);
}
}
else
{
try
{
String name = exchangeName == null ? null : exchangeName.intern().toString();
String type = body.getType() == null ? null : body.getType().intern().toString();
Map<String,Object> attributes = new HashMap<String, Object>();
attributes.put(org.apache.qpid.server.model.Exchange.ID, null);
attributes.put(org.apache.qpid.server.model.Exchange.NAME,name);
attributes.put(org.apache.qpid.server.model.Exchange.TYPE,type);
attributes.put(org.apache.qpid.server.model.Exchange.DURABLE, body.getDurable());
attributes.put(org.apache.qpid.server.model.Exchange.LIFETIME_POLICY,
body.getAutoDelete() ? LifetimePolicy.DELETE_ON_NO_LINKS : LifetimePolicy.PERMANENT);
attributes.put(org.apache.qpid.server.model.Exchange.ALTERNATE_EXCHANGE, null);
exchange = virtualHost.createExchange(attributes);
}
catch(ReservedExchangeNameException e)
{
throw body.getConnectionException(AMQConstant.NOT_ALLOWED,
"Attempt to declare exchange: " + exchangeName +
" which begins with reserved prefix.");
}
catch(ExchangeExistsException e)
{
exchange = e.getExistingExchange();
if(!new AMQShortString(exchange.getTypeName()).equals(body.getType()))
{
throw new AMQConnectionException(AMQConstant.NOT_ALLOWED, "Attempt to redeclare exchange: "
+ exchangeName + " of type "
+ exchange.getTypeName()
+ " to " + body.getType() +".",
body.getClazz(), body.getMethod(),
body.getMajor(), body.getMinor(),null);
}
}
catch(AMQUnknownExchangeType e)
{
throw body.getConnectionException(AMQConstant.COMMAND_INVALID, "Unknown exchange: " + exchangeName,e);
}
catch (AccessControlException e)
{
throw body.getConnectionException(AMQConstant.ACCESS_REFUSED, e.getMessage());
}
catch (UnknownExchangeException e)
{
// note - since 0-8/9/9-1 can't set the alt. exchange this exception should never occur
throw body.getConnectionException(AMQConstant.NOT_FOUND, "Unknown alternate exchange",e);
}
}
}
if(!body.getNowait())
{
MethodRegistry methodRegistry = session.getMethodRegistry();
AMQMethodBody responseBody = methodRegistry.createExchangeDeclareOkBody();
channel.sync();
session.writeFrame(responseBody.generateFrame(channelId));
}
}
protected boolean isDefaultExchange(final AMQShortString exchangeName)
{
return exchangeName == null || exchangeName.equals(AMQShortString.EMPTY_STRING);
}
}