/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at
* trunk/opends/resource/legal-notices/OpenDS.LICENSE
* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at
* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
* add the following below this CDDL HEADER, with the fields enclosed
* by brackets "[]" replaced with your own identifying information:
* Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*
*
* Copyright 2006-2010 Sun Microsystems, Inc.
* Portions Copyright 2011-2013 ForgeRock AS
*/
package org.opends.server.replication.server;
import static org.opends.messages.ReplicationMessages.*;
import static org.opends.server.loggers.ErrorLogger.logError;
import static org.opends.server.loggers.debug.DebugLogger.debugEnabled;
import static org.opends.server.loggers.debug.DebugLogger.getTracer;
import static org.opends.server.util.StaticUtils.stackTraceToSingleLineString;
import java.io.IOException;
import org.opends.messages.Message;
import org.opends.server.api.DirectoryThread;
import org.opends.server.loggers.debug.DebugTracer;
import org.opends.server.replication.common.ServerStatus;
import org.opends.server.replication.protocol.*;
/**
* This class implement the part of the replicationServer that is reading
* the connection from the LDAP servers to get all the updates that
* were done on this replica and forward them to other servers.
*
* A single thread is dedicated to this work.
* It waits in a blocking mode on the connection from the LDAP server
* and upon receiving an update puts in into the replicationServer cache
* from where the other servers will grab it.
*/
public class ServerReader extends DirectoryThread
{
/**
* The tracer object for the debug logger.
*/
private static final DebugTracer TRACER = getTracer();
private final Session session;
private final ServerHandler handler;
private final String remoteAddress;
/**
* Constructor for the LDAP server reader part of the replicationServer.
*
* @param session
* The Session from which to read the data.
* @param handler
* The server handler for this server reader.
*/
public ServerReader(Session session, ServerHandler handler)
{
super("Replication server RS(" + handler.getReplicationServerId()
+ ") reading from " + handler.toString() + " at "
+ session.getReadableRemoteAddress());
this.session = session;
this.handler = handler;
this.remoteAddress = session.getReadableRemoteAddress();
}
/**
* Create a loop that reads changes and hands them off to be processed.
*/
public void run()
{
Message errMessage = null;
if (debugEnabled())
{
TRACER.debugInfo(this.getName() + " starting");
}
/*
* wait on input stream
* grab all incoming messages and publish them to the
* replicationServerDomain
*/
try
{
while (true)
{
try
{
ReplicationMsg msg = session.receive();
if (debugEnabled())
TRACER.debugInfo("In " + getName() + " receives " + msg);
if (msg instanceof AckMsg)
{
AckMsg ack = (AckMsg) msg;
handler.checkWindow();
handler.processAck(ack);
} else if (msg instanceof UpdateMsg)
{
boolean filtered = false;
/* Ignore updates in some cases */
if (handler.isDataServer())
{
/**
* Ignore updates from 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).
*/
ServerStatus dsStatus = handler.getStatus();
if ((dsStatus == ServerStatus.BAD_GEN_ID_STATUS) ||
(dsStatus == ServerStatus.FULL_UPDATE_STATUS))
{
long referenceGenerationId = handler.getReferenceGenId();
if (dsStatus == ServerStatus.BAD_GEN_ID_STATUS)
logError(WARN_IGNORING_UPDATE_FROM_DS_BADGENID.get(
handler.getReplicationServerId(),
((UpdateMsg) msg).getChangeNumber().toString(),
handler.getServiceId(), handler.getServerId(),
session.getReadableRemoteAddress(),
handler.getGenerationId(),
referenceGenerationId));
if (dsStatus == ServerStatus.FULL_UPDATE_STATUS)
logError(WARN_IGNORING_UPDATE_FROM_DS_FULLUP.get(
handler.getReplicationServerId(),
((UpdateMsg) msg).getChangeNumber().toString(),
handler.getServiceId(), handler.getServerId(),
session.getReadableRemoteAddress()));
filtered = true;
}
} else
{
/**
* Ignore updates from RS with bad gen id
* (no system managed status for a RS)
*/
long referenceGenerationId =handler.getReferenceGenId();
if ((referenceGenerationId > 0) &&
(referenceGenerationId != handler.getGenerationId()))
{
logError(
WARN_IGNORING_UPDATE_FROM_RS.get(
handler.getReplicationServerId(),
((UpdateMsg) msg).getChangeNumber().toString(),
handler.getServiceId(),
handler.getServerId(),
session.getReadableRemoteAddress(),
handler.getGenerationId(),
referenceGenerationId));
filtered = true;
}
}
if (!filtered)
{
UpdateMsg update = (UpdateMsg) msg;
handler.decAndCheckWindow();
handler.put(update);
}
} else if (msg instanceof WindowMsg)
{
WindowMsg windowMsg = (WindowMsg) msg;
handler.updateWindow(windowMsg);
} else if (msg instanceof InitializeRequestMsg)
{
InitializeRequestMsg initializeMsg =
(InitializeRequestMsg) msg;
handler.process(initializeMsg);
} else if (msg instanceof InitializeRcvAckMsg)
{
InitializeRcvAckMsg initializeRcvAckMsg =
(InitializeRcvAckMsg) msg;
handler.process(initializeRcvAckMsg);
} else if (msg instanceof InitializeTargetMsg)
{
InitializeTargetMsg initializeMsg = (InitializeTargetMsg) msg;
handler.process(initializeMsg);
} else if (msg instanceof EntryMsg)
{
EntryMsg entryMsg = (EntryMsg) msg;
handler.process(entryMsg);
} else if (msg instanceof DoneMsg)
{
DoneMsg doneMsg = (DoneMsg) msg;
handler.process(doneMsg);
} else if (msg instanceof ErrorMsg)
{
ErrorMsg errorMsg = (ErrorMsg) msg;
handler.process(errorMsg);
} else if (msg instanceof ResetGenerationIdMsg)
{
ResetGenerationIdMsg genIdMsg = (ResetGenerationIdMsg) msg;
handler.processResetGenId(genIdMsg);
} else if (msg instanceof WindowProbeMsg)
{
WindowProbeMsg windowProbeMsg = (WindowProbeMsg) msg;
handler.process(windowProbeMsg);
} else if (msg instanceof TopologyMsg)
{
TopologyMsg topoMsg = (TopologyMsg) msg;
ReplicationServerHandler rsh = (ReplicationServerHandler)handler;
rsh.receiveTopoInfoFromRS(topoMsg);
} else if (msg instanceof ChangeStatusMsg)
{
ChangeStatusMsg csMsg = (ChangeStatusMsg) msg;
try
{
DataServerHandler dsh = (DataServerHandler)handler;
dsh.receiveNewStatus(csMsg);
}
catch(Exception e)
{
errMessage =
ERR_RECEIVED_CHANGE_STATUS_NOT_FROM_DS.get(
handler.getServiceId(),
Integer.toString(handler.getServerId()),
csMsg.toString());
logError(errMessage);
}
} else if (msg instanceof MonitorRequestMsg)
{
MonitorRequestMsg replServerMonitorRequestMsg =
(MonitorRequestMsg) msg;
handler.process(replServerMonitorRequestMsg);
} else if (msg instanceof MonitorMsg)
{
MonitorMsg replServerMonitorMsg = (MonitorMsg) msg;
handler.process(replServerMonitorMsg);
} else if (msg instanceof ChangeTimeHeartbeatMsg)
{
ChangeTimeHeartbeatMsg cthbMsg = (ChangeTimeHeartbeatMsg) msg;
handler.process(cthbMsg);
} else if (msg instanceof StopMsg)
{
// Peer server is properly disconnecting: go out of here to
// properly close the server handler going to finally block.
if (debugEnabled())
{
TRACER.debugInfo(handler.toString() + " has properly " +
"disconnected from this replication server " +
Integer.toString(handler.getReplicationServerId()));
}
return;
} else if (msg == null)
{
/*
* The remote server has sent an unknown message,
* close the conenction.
*/
errMessage = NOTE_READER_NULL_MSG.get(handler.toString());
logError(errMessage);
return;
}
} catch (NotSupportedOldVersionPDUException e)
{
// Received a V1 PDU we do not need to support:
// we just trash the message and log the event for debug purpose,
// then continue receiving messages.
if (debugEnabled())
TRACER.debugInfo(
"In " + this.getName() + " " + stackTraceToSingleLineString(e));
}
}
}
catch (IOException e)
{
/*
* The connection has been broken
* Log a message and exit from this loop
* So that this handler is stopped.
*/
if (debugEnabled())
TRACER.debugInfo(
"In " + this.getName() + " " + stackTraceToSingleLineString(e));
if (!handler.shuttingDown())
{
if (handler.isDataServer())
{
errMessage = ERR_DS_BADLY_DISCONNECTED.get(
handler.getReplicationServerId(), handler.getServerId(),
remoteAddress, handler.getServiceId());
}
else
{
errMessage = ERR_RS_BADLY_DISCONNECTED.get(
handler.getReplicationServerId(), handler.getServerId(),
remoteAddress, handler.getServiceId());
}
logError(errMessage);
}
}
catch (Exception e)
{
if (debugEnabled())
TRACER.debugInfo(
"In " + this.getName() + " " + stackTraceToSingleLineString(e));
/*
* The remote server has sent an unknown message,
* close the connection.
*/
errMessage = NOTE_READER_EXCEPTION.get(handler.toString());
logError(errMessage);
}
finally
{
/*
* The thread only exits the loop above if some error condition happen.
* Attempt to close the socket and stop the server handler.
*/
if (debugEnabled())
{
TRACER.debugInfo("In " + this.getName()
+ " closing the session");
}
session.close();
handler.doStop();
if (debugEnabled())
{
TRACER.debugInfo(this.getName() + " stopped " + errMessage);
}
}
}
}