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/*
*
* Copyright (c) 2006 The Apache Software Foundation
*
* Licensed 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.cluster;
import org.apache.log4j.Logger;
import org.apache.mina.common.IoSession;
import org.apache.qpid.AMQException;
import org.apache.qpid.codec.AMQCodecFactory;
import org.apache.qpid.framing.AMQBody;
import org.apache.qpid.framing.AMQFrame;
import org.apache.qpid.framing.ConnectionOpenBody;
import org.apache.qpid.framing.ConnectionSecureOkBody;
import org.apache.qpid.framing.ConnectionStartOkBody;
import org.apache.qpid.framing.ConnectionTuneOkBody;
import org.apache.qpid.framing.ClusterMembershipBody;
import org.apache.qpid.server.exchange.ExchangeRegistry;
import org.apache.qpid.server.protocol.AMQPFastProtocolHandler;
import org.apache.qpid.server.queue.QueueRegistry;
import org.apache.qpid.server.registry.ApplicationRegistry;
import org.apache.qpid.server.registry.IApplicationRegistry;
import org.apache.qpid.server.cluster.util.LogMessage;
import java.net.InetSocketAddress;
public class ClusteredProtocolHandler extends AMQPFastProtocolHandler implements InductionBuffer.MessageHandler
{
private static final Logger _logger = Logger.getLogger(ClusteredProtocolHandler.class);
private final InductionBuffer _peerBuffer = new InductionBuffer(this);
private final InductionBuffer _clientBuffer = new InductionBuffer(this);
private final GroupManager _groupMgr;
private final ServerHandlerRegistry _handlers;
public ClusteredProtocolHandler(InetSocketAddress address)
{
this(ApplicationRegistry.getInstance(), address);
}
public ClusteredProtocolHandler(IApplicationRegistry registry, InetSocketAddress address)
{
this(registry.getQueueRegistry(), registry.getExchangeRegistry(), address);
}
public ClusteredProtocolHandler(QueueRegistry queueRegistry, ExchangeRegistry exchangeRegistry, InetSocketAddress address)
{
super(queueRegistry, exchangeRegistry);
ClusterBuilder builder = new ClusterBuilder(address);
_groupMgr = builder.getGroupManager();
_handlers = builder.getHandlerRegistry();
}
public ClusteredProtocolHandler(ClusteredProtocolHandler handler)
{
super(handler);
_groupMgr = handler._groupMgr;
_handlers = handler._handlers;
}
protected void createSession(IoSession session, QueueRegistry queues, ExchangeRegistry exchanges, AMQCodecFactory codec) throws AMQException
{
new ClusteredProtocolSession(session, queues, exchanges, codec, new ServerHandlerRegistry(_handlers));
}
void connect(String join) throws Exception
{
if (join == null)
{
_groupMgr.establish();
}
else
{
_groupMgr.join(new SimpleMemberHandle(join));
}
}
private boolean inState(JoinState state)
{
return _groupMgr.getState().equals(state);
}
public void messageReceived(IoSession session, Object msg) throws Exception
{
JoinState state = _groupMgr.getState();
switch (state)
{
case JOINED:
_logger.debug(new LogMessage("Received {0}", msg));
super.messageReceived(session, msg);
break;
case JOINING:
case INITIATION:
case INDUCTION:
buffer(session, msg);
break;
default:
throw new AMQException("Received message while in state: " + state);
}
JoinState latest = _groupMgr.getState();
if (!latest.equals(state))
{
switch (latest)
{
case INDUCTION:
_logger.info("Reached induction, delivering buffered message from peers");
_peerBuffer.deliver();
break;
case JOINED:
_logger.info("Reached joined, delivering buffered message from clients");
_clientBuffer.deliver();
break;
}
}
}
private void buffer(IoSession session, Object msg) throws Exception
{
if (isBufferable(msg))
{
MemberHandle peer = ClusteredProtocolSession.getSessionPeer(session);
if (peer == null)
{
_logger.debug(new LogMessage("Buffering {0} for client", msg));
_clientBuffer.receive(session, msg);
}
else if (inState(JoinState.JOINING) && isMembershipAnnouncement(msg))
{
_logger.debug(new LogMessage("Initial membership [{0}] received from {1}", msg, peer));
super.messageReceived(session, msg);
}
else if (inState(JoinState.INITIATION) && _groupMgr.isLeader(peer))
{
_logger.debug(new LogMessage("Replaying {0} from leader ", msg));
super.messageReceived(session, msg);
}
else if (inState(JoinState.INDUCTION))
{
_logger.debug(new LogMessage("Replaying {0} from peer {1}", msg, peer));
super.messageReceived(session, msg);
}
else
{
_logger.debug(new LogMessage("Buffering {0} for peer {1}", msg, peer));
_peerBuffer.receive(session, msg);
}
}
else
{
_logger.debug(new LogMessage("Received {0}", msg));
super.messageReceived(session, msg);
}
}
public void deliver(IoSession session, Object msg) throws Exception
{
_logger.debug(new LogMessage("Delivering {0}", msg));
super.messageReceived(session, msg);
}
private boolean isMembershipAnnouncement(Object msg)
{
return msg instanceof AMQFrame && (((AMQFrame) msg).bodyFrame instanceof ClusterMembershipBody);
}
private boolean isBufferable(Object msg)
{
return msg instanceof AMQFrame && isBuffereable(((AMQFrame) msg).bodyFrame);
}
private boolean isBuffereable(AMQBody body)
{
return !(body instanceof ConnectionStartOkBody ||
body instanceof ConnectionTuneOkBody ||
body instanceof ConnectionSecureOkBody ||
body instanceof ConnectionOpenBody);
}
}
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