/*
|
* 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
|
*
|
*
|
* Portions Copyright 2006-2007 Sun Microsystems, Inc.
|
*/
|
package org.opends.server.replication.server;
|
import org.opends.messages.Message;
|
|
import static org.opends.server.loggers.ErrorLogger.logError;
|
import static org.opends.messages.ReplicationMessages.*;
|
import static org.opends.server.loggers.debug.DebugLogger.*;
|
import static org.opends.server.util.StaticUtils.stackTraceToSingleLineString;
|
|
|
import java.io.IOException;
|
|
import org.opends.server.api.DirectoryThread;
|
import org.opends.server.replication.protocol.AckMessage;
|
import org.opends.server.replication.protocol.DoneMessage;
|
import org.opends.server.replication.protocol.EntryMessage;
|
import org.opends.server.replication.protocol.ErrorMessage;
|
import org.opends.server.replication.protocol.ResetGenerationId;
|
import org.opends.server.replication.protocol.InitializeRequestMessage;
|
import org.opends.server.replication.protocol.InitializeTargetMessage;
|
import org.opends.server.replication.protocol.ProtocolSession;
|
import org.opends.server.replication.protocol.ReplicationMessage;
|
import org.opends.server.replication.protocol.UpdateMessage;
|
import org.opends.server.replication.protocol.WindowMessage;
|
import org.opends.server.replication.protocol.WindowProbe;
|
import org.opends.server.replication.protocol.ReplServerInfoMessage;
|
import org.opends.server.loggers.debug.DebugTracer;
|
|
|
/**
|
* 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 short serverId;
|
private ProtocolSession session;
|
private ServerHandler handler;
|
private ReplicationCache replicationCache;
|
|
/**
|
* Constructor for the LDAP server reader part of the replicationServer.
|
*
|
* @param session The ProtocolSession from which to read the data.
|
* @param serverId The server ID of the server from which we read messages.
|
* @param handler The server handler for this server reader.
|
* @param replicationCache The ReplicationCache for this server reader.
|
*/
|
public ServerReader(ProtocolSession session, short serverId,
|
ServerHandler handler, ReplicationCache replicationCache)
|
{
|
super(handler.toString() + " reader");
|
this.session = session;
|
this.serverId = serverId;
|
this.handler = handler;
|
this.replicationCache = replicationCache;
|
}
|
|
/**
|
* Create a loop that reads changes and hands them off to be processed.
|
*/
|
public void run()
|
{
|
if (debugEnabled())
|
{
|
TRACER.debugInfo(
|
"In RS " + replicationCache.getReplicationServer().
|
getMonitorInstanceName() +
|
(handler.isReplicationServer()?" RS ":" LS")+
|
" reader starting for serverId=" + serverId);
|
}
|
/*
|
* wait on input stream
|
* grab all incoming messages and publish them to the replicationCache
|
*/
|
try
|
{
|
while (true)
|
{
|
ReplicationMessage msg = session.receive();
|
|
if (debugEnabled())
|
{
|
TRACER.debugInfo(
|
"In RS " + replicationCache.getReplicationServer().
|
getMonitorInstanceName() +
|
(handler.isReplicationServer()?" From RS ":" From LS")+
|
" with serverId=" + serverId + " receives " + msg);
|
}
|
if (msg instanceof AckMessage)
|
{
|
AckMessage ack = (AckMessage) msg;
|
handler.checkWindow();
|
replicationCache.ack(ack, serverId);
|
}
|
else if (msg instanceof UpdateMessage)
|
{
|
// Ignore update received from a replica with
|
// a bad generation ID
|
long referenceGenerationId = replicationCache.getGenerationId();
|
if ((referenceGenerationId>0) &&
|
(referenceGenerationId != handler.getGenerationId()))
|
{
|
logError(ERR_IGNORING_UPDATE_FROM.get(
|
msg.toString(),
|
handler.getMonitorInstanceName()));
|
}
|
else
|
{
|
UpdateMessage update = (UpdateMessage) msg;
|
handler.decAndCheckWindow();
|
replicationCache.put(update, handler);
|
}
|
}
|
else if (msg instanceof WindowMessage)
|
{
|
WindowMessage windowMsg = (WindowMessage) msg;
|
handler.updateWindow(windowMsg);
|
}
|
else if (msg instanceof InitializeRequestMessage)
|
{
|
InitializeRequestMessage initializeMsg =
|
(InitializeRequestMessage) msg;
|
handler.process(initializeMsg);
|
}
|
else if (msg instanceof InitializeTargetMessage)
|
{
|
InitializeTargetMessage initializeMsg = (InitializeTargetMessage) msg;
|
handler.process(initializeMsg);
|
}
|
else if (msg instanceof EntryMessage)
|
{
|
EntryMessage entryMsg = (EntryMessage) msg;
|
handler.process(entryMsg);
|
}
|
else if (msg instanceof DoneMessage)
|
{
|
DoneMessage doneMsg = (DoneMessage) msg;
|
handler.process(doneMsg);
|
}
|
else if (msg instanceof ErrorMessage)
|
{
|
ErrorMessage errorMsg = (ErrorMessage) msg;
|
handler.process(errorMsg);
|
}
|
else if (msg instanceof ResetGenerationId)
|
{
|
ResetGenerationId genIdMsg = (ResetGenerationId) msg;
|
replicationCache.resetGenerationId(this.handler, genIdMsg);
|
}
|
else if (msg instanceof WindowProbe)
|
{
|
WindowProbe windowProbeMsg = (WindowProbe) msg;
|
handler.process(windowProbeMsg);
|
}
|
else if (msg instanceof ReplServerInfoMessage)
|
{
|
ReplServerInfoMessage infoMsg = (ReplServerInfoMessage)msg;
|
handler.receiveReplServerInfo(infoMsg);
|
|
if (debugEnabled())
|
{
|
if (handler.isReplicationServer())
|
TRACER.debugInfo(
|
"In RS " + replicationCache.getReplicationServer().
|
getServerId() +
|
" Receiving replServerInfo from " + handler.getServerId() +
|
" baseDn=" + replicationCache.getBaseDn() +
|
" genId=" + infoMsg.getGenerationId());
|
}
|
|
if (replicationCache.getGenerationId()<0)
|
{
|
// Here is the case where a ReplicationServer receives from
|
// another ReplicationServer the generationId for a domain
|
// for which the generation ID has never been set.
|
replicationCache.setGenerationId(infoMsg.getGenerationId(), false);
|
}
|
else
|
{
|
if (infoMsg.getGenerationId()<0)
|
{
|
// Here is the case where another ReplicationServer
|
// signals that it has no generationId set for the domain.
|
// If we have generationId set locally and no server currently
|
// connected for that domain in the topology then we may also
|
// reset the generationId localy.
|
replicationCache.mayResetGenerationId();
|
}
|
|
if (replicationCache.getGenerationId() != infoMsg.getGenerationId())
|
{
|
Message message = NOTE_BAD_GENERATION_ID.get(
|
replicationCache.getBaseDn().toNormalizedString(),
|
Short.toString(handler.getServerId()),
|
Long.toString(infoMsg.getGenerationId()),
|
Long.toString(replicationCache.getGenerationId()));
|
|
ErrorMessage errorMsg = new ErrorMessage(
|
replicationCache.getReplicationServer().getServerId(),
|
handler.getServerId(),
|
message);
|
session.publish(errorMsg);
|
}
|
}
|
}
|
else if (msg == null)
|
{
|
/*
|
* The remote server has sent an unknown message,
|
* close the conenction.
|
*/
|
Message message = NOTE_READER_NULL_MSG.get(handler.toString());
|
logError(message);
|
return;
|
}
|
}
|
} 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 RS " + replicationCache.getReplicationServer().
|
getMonitorInstanceName() +
|
" reader IO EXCEPTION for serverID=" + serverId
|
+ stackTraceToSingleLineString(e) + " " + e.getLocalizedMessage());
|
Message message = NOTE_SERVER_DISCONNECT.get(handler.toString());
|
logError(message);
|
} catch (ClassNotFoundException e)
|
{
|
if (debugEnabled())
|
TRACER.debugInfo(
|
"In RS <" + replicationCache.getReplicationServer().
|
getMonitorInstanceName() +
|
" reader CNF EXCEPTION serverID=" + serverId
|
+ stackTraceToSingleLineString(e));
|
/*
|
* The remote server has sent an unknown message,
|
* close the connection.
|
*/
|
Message message = ERR_UNKNOWN_MESSAGE.get(handler.toString());
|
logError(message);
|
} catch (Exception e)
|
{
|
if (debugEnabled())
|
TRACER.debugInfo(
|
"In RS <" + replicationCache.getReplicationServer().
|
getMonitorInstanceName() +
|
" server reader EXCEPTION serverID=" + serverId
|
+ stackTraceToSingleLineString(e));
|
/*
|
* The remote server has sent an unknown message,
|
* close the connection.
|
*/
|
Message message = NOTE_READER_EXCEPTION.get(handler.toString());
|
logError(message);
|
}
|
finally
|
{
|
/*
|
* The thread only exit the loop above is some error condition
|
* happen.
|
* Attempt to close the socket and stop the server handler.
|
*/
|
if (debugEnabled())
|
TRACER.debugInfo(
|
"In RS " + replicationCache.getReplicationServer().
|
getMonitorInstanceName() +
|
" server reader for serverID=" + serverId +
|
" is closing the session");
|
try
|
{
|
session.close();
|
} catch (IOException e)
|
{
|
// ignore
|
}
|
replicationCache.stopServer(handler);
|
}
|
if (debugEnabled())
|
TRACER.debugInfo(
|
"In RS " + replicationCache.getReplicationServer().
|
getMonitorInstanceName() +
|
(handler.isReplicationServer()?" RS":" LDAP") +
|
" server reader stopped for serverID=" + serverId);
|
}
|
}
|
