package org.apache.cassandra.gms;
/*
*
* 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.
*
*/
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.net.InetAddress;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.net.IVerbHandler;
import org.apache.cassandra.net.Message;
import org.apache.cassandra.net.MessagingService;
public class GossipDigestAckVerbHandler implements IVerbHandler
{
private static Logger logger_ = LoggerFactory.getLogger(GossipDigestAckVerbHandler.class);
public void doVerb(Message message, String id)
{
InetAddress from = message.getFrom();
if (logger_.isTraceEnabled())
logger_.trace("Received a GossipDigestAckMessage from {}", from);
if (!Gossiper.instance.isEnabled())
{
if (logger_.isTraceEnabled())
logger_.trace("Ignoring GossipDigestAckMessage because gossip is disabled");
return;
}
byte[] bytes = message.getMessageBody();
DataInputStream dis = new DataInputStream( new ByteArrayInputStream(bytes) );
try
{
GossipDigestAckMessage gDigestAckMessage = GossipDigestAckMessage.serializer().deserialize(dis);
List<GossipDigest> gDigestList = gDigestAckMessage.getGossipDigestList();
Map<InetAddress, EndpointState> epStateMap = gDigestAckMessage.getEndpointStateMap();
if ( epStateMap.size() > 0 )
{
/* Notify the Failure Detector */
Gossiper.instance.notifyFailureDetector(epStateMap);
Gossiper.instance.applyStateLocally(epStateMap);
}
/* Get the state required to send to this gossipee - construct GossipDigestAck2Message */
Map<InetAddress, EndpointState> deltaEpStateMap = new HashMap<InetAddress, EndpointState>();
for( GossipDigest gDigest : gDigestList )
{
InetAddress addr = gDigest.getEndpoint();
EndpointState localEpStatePtr = Gossiper.instance.getStateForVersionBiggerThan(addr, gDigest.getMaxVersion());
if ( localEpStatePtr != null )
deltaEpStateMap.put(addr, localEpStatePtr);
}
GossipDigestAck2Message gDigestAck2 = new GossipDigestAck2Message(deltaEpStateMap);
Message gDigestAck2Message = Gossiper.instance.makeGossipDigestAck2Message(gDigestAck2);
if (logger_.isTraceEnabled())
logger_.trace("Sending a GossipDigestAck2Message to {}", from);
MessagingService.instance().sendOneWay(gDigestAck2Message, from);
}
catch ( IOException e )
{
throw new RuntimeException(e);
}
}
}