/*
|
* The contents of this file are subject to the terms of the Common Development and
|
* Distribution License (the License). You may not use this file except in compliance with the
|
* License.
|
*
|
* You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
|
* specific language governing permission and limitations under the License.
|
*
|
* When distributing Covered Software, include this CDDL Header Notice in each file and include
|
* the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
|
* Header, with the fields enclosed by brackets [] replaced by your own identifying
|
* information: "Portions Copyright [year] [name of copyright owner]".
|
*
|
* Copyright 2006-2009 Sun Microsystems, Inc.
|
* Portions Copyright 2011-2015 ForgeRock AS.
|
*/
|
package org.opends.server.replication.server;
|
|
import java.net.SocketException;
|
|
import org.forgerock.i18n.LocalizableMessage;
|
import org.opends.server.api.DirectoryThread;
|
import org.forgerock.i18n.slf4j.LocalizedLogger;
|
import org.opends.server.replication.common.ServerStatus;
|
import org.opends.server.replication.protocol.ReplicaOfflineMsg;
|
import org.opends.server.replication.protocol.Session;
|
import org.opends.server.replication.protocol.UpdateMsg;
|
import org.opends.server.replication.service.DSRSShutdownSync;
|
|
import static org.opends.messages.ReplicationMessages.*;
|
import static org.opends.server.replication.common.ServerStatus.*;
|
import static org.opends.server.util.StaticUtils.*;
|
|
/**
|
* This class defines a server writer, which is used to send changes to a
|
* directory server.
|
*/
|
public class ServerWriter extends DirectoryThread
|
{
|
private static final LocalizedLogger logger = LocalizedLogger.getLoggerForThisClass();
|
|
private final Session session;
|
private final ServerHandler handler;
|
private final ReplicationServerDomain replicationServerDomain;
|
private final DSRSShutdownSync dsrsShutdownSync;
|
|
/**
|
* Create a ServerWriter. Then ServerWriter then waits on the ServerHandler
|
* for new updates and forward them to the server
|
*
|
* @param session
|
* the Session that will be used to send updates.
|
* @param handler
|
* handler for which the ServerWriter is created.
|
* @param replicationServerDomain
|
* The ReplicationServerDomain of this ServerWriter.
|
* @param dsrsShutdownSync Synchronization object for shutdown of combined DS/RS instances.
|
*/
|
public ServerWriter(Session session, ServerHandler handler,
|
ReplicationServerDomain replicationServerDomain,
|
DSRSShutdownSync dsrsShutdownSync)
|
{
|
// Session may be null for ECLServerWriter.
|
super("Replication server RS(" + handler.getReplicationServerId()
|
+ ") writing to " + handler + " at "
|
+ (session != null ? session.getReadableRemoteAddress() : "unknown"));
|
|
this.session = session;
|
this.handler = handler;
|
this.replicationServerDomain = replicationServerDomain;
|
this.dsrsShutdownSync = dsrsShutdownSync;
|
}
|
|
/**
|
* Run method for the ServerWriter.
|
* Loops waiting for changes from the ReplicationServerDomain and forward them
|
* to the other servers
|
*/
|
@Override
|
public void run()
|
{
|
if (logger.isTraceEnabled())
|
{
|
logger.trace(getName() + " starting");
|
}
|
|
LocalizableMessage errMessage = null;
|
try
|
{
|
boolean shutdown = false;
|
while (!shutdown
|
|| !dsrsShutdownSync.canShutdown(replicationServerDomain.getBaseDN()))
|
{
|
final UpdateMsg updateMsg = this.handler.take();
|
if (updateMsg == null)
|
{
|
// this connection is closing
|
errMessage = LocalizableMessage.raw(
|
"Connection closure: null update returned by domain.");
|
shutdown = true;
|
}
|
else if (!isUpdateMsgFiltered(updateMsg))
|
{
|
// Publish the update to the remote server using a protocol version it supports
|
session.publish(updateMsg);
|
if (updateMsg instanceof ReplicaOfflineMsg)
|
{
|
dsrsShutdownSync.replicaOfflineMsgForwarded(replicationServerDomain.getBaseDN());
|
}
|
}
|
}
|
}
|
catch (SocketException e)
|
{
|
/*
|
* The remote host has disconnected and this particular Tree is going to
|
* be removed, just ignore the exception and let the thread die as well
|
*/
|
errMessage = handler.getBadlyDisconnectedErrorMessage();
|
logger.error(errMessage);
|
}
|
catch (Exception e)
|
{
|
/*
|
* An unexpected error happened.
|
* Log an error and close the connection.
|
*/
|
errMessage = ERR_WRITER_UNEXPECTED_EXCEPTION.get(handler +
|
" " + stackTraceToSingleLineString(e));
|
logger.error(errMessage);
|
}
|
finally {
|
session.close();
|
replicationServerDomain.stopServer(handler, false);
|
if (logger.isTraceEnabled())
|
{
|
logger.trace(getName() + " stopped " + errMessage);
|
}
|
}
|
}
|
|
private boolean isUpdateMsgFiltered(UpdateMsg updateMsg)
|
{
|
if (handler.isDataServer())
|
{
|
/**
|
* Ignore updates to DS in bad BAD_GENID_STATUS or FULL_UPDATE_STATUS
|
*
|
* The RSD lock should not be taken here as it is acceptable to have a delay
|
* between the time the server has a wrong status and the fact we detect it:
|
* the updates that succeed to pass during this time will have no impact on remote server.
|
* But it is interesting to not saturate uselessly the network
|
* if the updates are not necessary so this check to stop sending updates is interesting anyway.
|
* Not taking the RSD lock allows to have better performances in normal mode (most of the time).
|
*/
|
final ServerStatus dsStatus = handler.getStatus();
|
if (dsStatus == BAD_GEN_ID_STATUS)
|
{
|
logger.warn(WARN_IGNORING_UPDATE_TO_DS_BADGENID, handler.getReplicationServerId(),
|
updateMsg.getCSN(), handler.getBaseDN(), handler.getServerId(),
|
session.getReadableRemoteAddress(),
|
handler.getGenerationId(),
|
replicationServerDomain.getGenerationId());
|
return true;
|
}
|
else if (dsStatus == FULL_UPDATE_STATUS)
|
{
|
logger.warn(WARN_IGNORING_UPDATE_TO_DS_FULLUP, handler.getReplicationServerId(),
|
updateMsg.getCSN(), handler.getBaseDN(), handler.getServerId(),
|
session.getReadableRemoteAddress());
|
return true;
|
}
|
}
|
else
|
{
|
/**
|
* Ignore updates to RS with bad gen id
|
* (no system managed status for a RS)
|
*/
|
final long referenceGenerationId = replicationServerDomain.getGenerationId();
|
if (referenceGenerationId != handler.getGenerationId()
|
|| referenceGenerationId == -1 || handler.getGenerationId() == -1)
|
{
|
logger.error(WARN_IGNORING_UPDATE_TO_RS,
|
handler.getReplicationServerId(),
|
updateMsg.getCSN(), handler.getBaseDN(), handler.getServerId(),
|
session.getReadableRemoteAddress(),
|
handler.getGenerationId(),
|
referenceGenerationId);
|
return true;
|
}
|
}
|
return false;
|
}
|
}
|
