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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.cluster.handler;
import org.apache.log4j.Logger;
import org.apache.qpid.AMQException;
import org.apache.qpid.framing.AMQMethodBody;
import org.apache.qpid.server.cluster.BroadcastPolicy;
import org.apache.qpid.server.cluster.ClusteredProtocolSession;
import org.apache.qpid.server.cluster.GroupManager;
import org.apache.qpid.server.cluster.GroupResponseHandler;
import org.apache.qpid.server.cluster.util.LogMessage;
import org.apache.qpid.server.cluster.Member;
import org.apache.qpid.server.cluster.SimpleSendable;
import org.apache.qpid.server.cluster.policy.StandardPolicies;
import org.apache.qpid.server.exchange.ExchangeRegistry;
import org.apache.qpid.server.protocol.AMQMethodEvent;
import org.apache.qpid.server.protocol.AMQProtocolSession;
import org.apache.qpid.server.queue.QueueRegistry;
import org.apache.qpid.server.state.AMQStateManager;
import org.apache.qpid.server.state.StateAwareMethodListener;
import java.util.List;
/**
* Basic template for handling methods that should be broadcast to the group and
* processed locally after 'completion' of this broadcast.
*
*/
class ReplicatingHandler<A extends AMQMethodBody> extends ClusterMethodHandler<A> implements StandardPolicies
{
protected static final Logger _logger = Logger.getLogger(ReplicatingHandler.class);
private final StateAwareMethodListener<A> _base;
private final GroupManager _groupMgr;
private final BroadcastPolicy _policy;
ReplicatingHandler(GroupManager groupMgr, StateAwareMethodListener<A> base)
{
this(groupMgr, base, null);
}
ReplicatingHandler(GroupManager groupMgr, StateAwareMethodListener<A> base, BroadcastPolicy policy)
{
_groupMgr = groupMgr;
_base = base;
_policy = policy;
}
protected void peer(AMQStateManager stateMgr, QueueRegistry queues, ExchangeRegistry exchanges, AMQProtocolSession session, AMQMethodEvent<A> evt) throws AMQException
{
local(stateMgr, queues, exchanges, session, evt);
_logger.debug(new LogMessage("Handled {0} locally", evt.getMethod()));
}
protected void client(AMQStateManager stateMgr, QueueRegistry queues, ExchangeRegistry exchanges, AMQProtocolSession session, AMQMethodEvent<A> evt) throws AMQException
{
replicate(stateMgr, queues, exchanges, session, evt);
}
protected void replicate(AMQStateManager stateMgr, QueueRegistry queues, ExchangeRegistry exchanges, AMQProtocolSession session, AMQMethodEvent<A> evt) throws AMQException
{
if (_policy == null)
{
//asynch delivery
_groupMgr.broadcast(new SimpleSendable(evt.getMethod()));
local(stateMgr, queues, exchanges, session, evt);
}
else
{
Callback callback = new Callback(stateMgr, queues, exchanges, session, evt);
_groupMgr.broadcast(new SimpleSendable(evt.getMethod()), _policy, callback);
}
_logger.debug(new LogMessage("Replicated {0} to peers", evt.getMethod()));
}
protected void local(AMQStateManager stateMgr, QueueRegistry queues, ExchangeRegistry exchanges, AMQProtocolSession session, AMQMethodEvent<A> evt) throws AMQException
{
_base.methodReceived(stateMgr, queues, exchanges, session, evt);
}
private class Callback implements GroupResponseHandler
{
private final AMQStateManager _stateMgr;
private final QueueRegistry _queues;
private final ExchangeRegistry _exchanges;
private final AMQProtocolSession _session;
private final AMQMethodEvent<A> _evt;
Callback(AMQStateManager stateMgr, QueueRegistry queues, ExchangeRegistry exchanges, AMQProtocolSession session, AMQMethodEvent<A> evt)
{
_stateMgr = stateMgr;
_queues = queues;
_exchanges = exchanges;
_session = session;
_evt = evt;
}
public void response(List<AMQMethodBody> responses, List<Member> members)
{
try
{
local(_stateMgr, _queues, _exchanges, _session, _evt);
_logger.debug(new LogMessage("Handled {0} locally, in response to completion of replication", _evt.getMethod()));
}
catch (AMQException e)
{
_logger.error(new LogMessage("Error handling {0}:{1}", _evt.getMethod(), e), e);
}
}
}
}