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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.state;
import org.apache.log4j.Logger;
import org.apache.qpid.AMQException;
import org.apache.qpid.framing.AMQMethodBody;
import org.apache.qpid.framing.ChannelCloseBody;
import org.apache.qpid.framing.ChannelCloseOkBody;
import org.apache.qpid.framing.ChannelOpenBody;
import org.apache.qpid.framing.MethodDispatcher;
import org.apache.qpid.protocol.AMQConstant;
import org.apache.qpid.protocol.AMQMethodEvent;
import org.apache.qpid.protocol.AMQMethodListener;
import org.apache.qpid.server.model.Broker;
import org.apache.qpid.server.protocol.AMQProtocolSession;
import org.apache.qpid.server.security.SecurityManager;
import org.apache.qpid.server.security.SubjectCreator;
import org.apache.qpid.server.virtualhost.VirtualHostRegistry;
import java.util.concurrent.CopyOnWriteArraySet;
/**
* The state manager is responsible for managing the state of the protocol session. <p/> For each AMQProtocolHandler
* there is a separate state manager.
*/
public class AMQStateManager implements AMQMethodListener
{
private static final Logger _logger = Logger.getLogger(AMQStateManager.class);
private final Broker _broker;
private final AMQProtocolSession _protocolSession;
/** The current state */
private AMQState _currentState;
private CopyOnWriteArraySet<StateListener> _stateListeners = new CopyOnWriteArraySet<StateListener>();
public AMQStateManager(Broker broker, AMQProtocolSession protocolSession)
{
_broker = broker;
_protocolSession = protocolSession;
_currentState = AMQState.CONNECTION_NOT_STARTED;
}
/**
* Get the Broker instance
*
* @return the Broker
*/
public Broker getBroker()
{
return _broker;
}
public AMQState getCurrentState()
{
return _currentState;
}
public void changeState(AMQState newState) throws AMQException
{
_logger.debug("State changing to " + newState + " from old state " + _currentState);
final AMQState oldState = _currentState;
_currentState = newState;
for (StateListener l : _stateListeners)
{
l.stateChanged(oldState, newState);
}
}
public void error(Exception e)
{
_logger.error("State manager received error notification[Current State:" + _currentState + "]: " + e, e);
for (StateListener l : _stateListeners)
{
l.error(e);
}
}
public <B extends AMQMethodBody> boolean methodReceived(AMQMethodEvent<B> evt) throws AMQException
{
MethodDispatcher dispatcher = _protocolSession.getMethodDispatcher();
final int channelId = evt.getChannelId();
B body = evt.getMethod();
if(channelId != 0 && _protocolSession.getChannel(channelId)== null)
{
if(! ((body instanceof ChannelOpenBody)
|| (body instanceof ChannelCloseOkBody)
|| (body instanceof ChannelCloseBody)))
{
throw body.getConnectionException(AMQConstant.CHANNEL_ERROR, "channel is closed won't process:" + body);
}
}
return body.execute(dispatcher, channelId);
}
private <B extends AMQMethodBody> void checkChannel(AMQMethodEvent<B> evt, AMQProtocolSession protocolSession)
throws AMQException
{
if ((evt.getChannelId() != 0) && !(evt.getMethod() instanceof ChannelOpenBody)
&& (protocolSession.getChannel(evt.getChannelId()) == null)
&& !protocolSession.channelAwaitingClosure(evt.getChannelId()))
{
throw evt.getMethod().getChannelNotFoundException(evt.getChannelId());
}
}
public void addStateListener(StateListener listener)
{
_logger.debug("Adding state listener");
_stateListeners.add(listener);
}
public void removeStateListener(StateListener listener)
{
_stateListeners.remove(listener);
}
public VirtualHostRegistry getVirtualHostRegistry()
{
return _broker.getVirtualHostRegistry();
}
public AMQProtocolSession getProtocolSession()
{
SecurityManager.setThreadSubject(_protocolSession.getAuthorizedSubject());
return _protocolSession;
}
public SubjectCreator getSubjectCreator()
{
return _broker.getSubjectCreator(getProtocolSession().getLocalAddress());
}
}
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