/*
* Copyright (C) 2009 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.exoplatform.services.jcr.ext.replication.priority;
import org.exoplatform.services.jcr.ext.replication.Packet;
import org.exoplatform.services.jcr.ext.replication.transport.AbstractPacket;
import org.exoplatform.services.jcr.ext.replication.transport.ChannelManager;
import org.exoplatform.services.jcr.ext.replication.transport.MemberAddress;
import org.exoplatform.services.log.ExoLogger;
import org.exoplatform.services.log.Log;
import java.util.List;
/**
* Created by The eXo Platform SAS.
*
* @author <a href="mailto:alex.reshetnyak@exoplatform.com.ua">Alex Reshetnyak</a>
* @version $Id: PublisherPriorityChecker.java 111 2008-11-11 11:11:11Z rainf0x $
*/
public class DynamicPriorityChecker extends AbstractPriorityChecker
{
/**
* The apache logger.
*/
private static Log log = ExoLogger.getLogger("exo.jcr.component.ext.DynamicPriorityChecker");
/**
* The previous participants counter.
*/
private int previousParticipantsCount;
/**
* The previous max priority value.
*/
private int previousMaxPriority;
/**
* DynamicPriorityChecker constructor.
*
* @param channelManager
* the ChannelManager
* @param ownPriority
* the own priority
* @param ownName
* the own name
* @param otherParticipants
* the list of names to other participants
*/
public DynamicPriorityChecker(ChannelManager channelManager, int ownPriority, String ownName,
List<String> otherParticipants)
{
super(channelManager, ownPriority, ownName, otherParticipants);
}
/**
* {@inheritDoc}
*/
public void receive(AbstractPacket p, MemberAddress sourceAddress)
{
Packet packet = (Packet)p;
if (log.isDebugEnabled())
log.info(" ------->>> MessageListener.receive(), byte == " + packet.getByteArray());
try
{
if (!ownName.equals(packet.getOwnerName()))
switch (packet.getPacketType())
{
case Packet.PacketType.GET_ALL_PRIORITY :
Packet pktMyPriority =
new Packet(Packet.PacketType.OWN_PRIORITY, ownName, (long)ownPriority, packet.getIdentifier());
super.waitView();
channelManager.sendPacket(pktMyPriority);
break;
case Packet.PacketType.OWN_PRIORITY :
if (identifier != null && identifier.equals(packet.getIdentifier()))
{
currentParticipants.put(packet.getOwnerName(), Integer.valueOf((int)packet.getSize()));
if (log.isDebugEnabled())
{
log.info(channelManager.getChannel().getClusterName() + " : " + identifier
+ " : added member :");
log.info(" +" + packet.getOwnerName() + ":" + currentParticipants.get(packet.getOwnerName()));
}
}
if (log.isDebugEnabled())
printOnlineMembers();
break;
default :
break;
}
}
catch (Exception e)
{
log.error("An error in processing packet : ", e);
}
}
/**
* {@inheritDoc}
*/
public void informAll()
{
previousParticipantsCount = currentParticipants.size() + 1;
previousMaxPriority = getCurrentMaxPriority();
super.informAll();
}
/**
* getCurrentMaxPriority.
*
* @return int return the current max value
*/
private int getCurrentMaxPriority()
{
int max = Integer.MIN_VALUE;
for (String nodeName : currentParticipants.keySet())
if (currentParticipants.get(nodeName) > max)
max = currentParticipants.get(nodeName);
if (ownPriority > max)
max = ownPriority;
return max == Integer.MIN_VALUE ? ownPriority : max;
}
/**
* {@inheritDoc}
*/
public boolean isMaxPriority()
{
if (otherParticipants.size() == 1)
return ownPriority == MAX_PRIORITY;
else if (otherParticipants.size() > 1 && currentParticipants.size() == 0 && ownPriority == MAX_PRIORITY)
return false;
else if (otherParticipants.size() > 1 && currentParticipants.size() == 0 && previousMaxPriority != ownPriority
&& previousParticipantsCount > 1)
return false;
else
return true;
}
/**
* {@inheritDoc}
*/
public void onError(MemberAddress sourceAddress)
{
}
}