/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2006-2009 Sun Microsystems, Inc.
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*/
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package org.opends.server.replication.server;
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import static org.opends.messages.ReplicationMessages.*;
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import static org.opends.server.loggers.ErrorLogger.logError;
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import static org.opends.server.loggers.debug.DebugLogger.debugEnabled;
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import static org.opends.server.loggers.debug.DebugLogger.getTracer;
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import static org.opends.server.util.StaticUtils.stackTraceToSingleLineString;
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import java.io.IOException;
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import org.opends.messages.Message;
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import org.opends.server.api.DirectoryThread;
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import org.opends.server.loggers.debug.DebugTracer;
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import org.opends.server.replication.common.ServerStatus;
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import org.opends.server.replication.protocol.*;
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/**
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* This class implement the part of the replicationServer that is reading
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* the connection from the LDAP servers to get all the updates that
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* were done on this replica and forward them to other servers.
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*
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* A single thread is dedicated to this work.
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* It waits in a blocking mode on the connection from the LDAP server
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* and upon receiving an update puts in into the replicationServer cache
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* from where the other servers will grab it.
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*/
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public class ServerReader extends DirectoryThread
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{
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/**
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* The tracer object for the debug logger.
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*/
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private static final DebugTracer TRACER = getTracer();
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private int serverId;
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private ProtocolSession session;
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private ServerHandler handler;
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private ReplicationServerDomain replicationServerDomain;
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/**
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* Constructor for the LDAP server reader part of the replicationServer.
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*
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* @param session The ProtocolSession from which to read the data.
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* @param serverId The server ID of the server from which we read messages.
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* @param handler The server handler for this server reader.
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* @param replicationServerDomain The ReplicationServerDomain for this server
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* reader.
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*/
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public ServerReader(ProtocolSession session, int serverId,
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ServerHandler handler,
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ReplicationServerDomain replicationServerDomain)
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{
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super("Replication Reader Thread for handler of " +
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handler.toString() +
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" in " + replicationServerDomain);
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this.session = session;
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this.serverId = serverId;
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this.handler = handler;
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this.replicationServerDomain = replicationServerDomain;
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}
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/**
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* Create a loop that reads changes and hands them off to be processed.
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*/
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public void run()
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{
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Message errMessage = null;
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if (debugEnabled())
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{
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TRACER.debugInfo(this.getName() + " starting");
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}
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/*
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* wait on input stream
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* grab all incoming messages and publish them to the
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* replicationServerDomain
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*/
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try
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{
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while (true)
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{
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try
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{
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ReplicationMsg msg = session.receive();
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if (debugEnabled())
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{
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TRACER.debugInfo("In " + replicationServerDomain + " " +
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getName() + " receives " + msg);
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}
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if (msg instanceof AckMsg)
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{
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AckMsg ack = (AckMsg) msg;
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handler.checkWindow();
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replicationServerDomain.processAck(ack, handler);
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} else if (msg instanceof UpdateMsg)
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{
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boolean filtered = false;
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/* Ignore updates in some cases */
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if (handler.isDataServer())
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{
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/**
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* Ignore updates from DS in bad BAD_GENID_STATUS or
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* FULL_UPDATE_STATUS
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*
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* The RSD lock should not be taken here as it is acceptable to
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* have a delay between the time the server has a wrong status and
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* the fact we detect it: the updates that succeed to pass during
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* this time will have no impact on remote server. But it is
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* interesting to not saturate uselessly the network if the
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* updates are not necessary so this check to stop sending updates
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* is interesting anyway. Not taking the RSD lock allows to have
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* better performances in normal mode (most of the time).
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*/
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ServerStatus dsStatus = handler.getStatus();
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if ((dsStatus == ServerStatus.BAD_GEN_ID_STATUS) ||
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(dsStatus == ServerStatus.FULL_UPDATE_STATUS))
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{
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long referenceGenerationId =
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replicationServerDomain.getGenerationId();
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if (dsStatus == ServerStatus.BAD_GEN_ID_STATUS)
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logError(ERR_IGNORING_UPDATE_FROM_DS_BADGENID.get(
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Integer.toString(replicationServerDomain.
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getReplicationServer().getServerId()),
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replicationServerDomain.getBaseDn(),
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((UpdateMsg) msg).getChangeNumber().toString(),
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Integer.toString(handler.getServerId()),
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Long.toString(referenceGenerationId),
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Long.toString(handler.getGenerationId())));
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if (dsStatus == ServerStatus.FULL_UPDATE_STATUS)
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logError(ERR_IGNORING_UPDATE_FROM_DS_FULLUP.get(
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Integer.toString(replicationServerDomain.
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getReplicationServer().getServerId()),
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replicationServerDomain.getBaseDn(),
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((UpdateMsg) msg).getChangeNumber().toString(),
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Integer.toString(handler.getServerId())));
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filtered = true;
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}
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} else
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{
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/**
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* Ignore updates from RS with bad gen id
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* (no system managed status for a RS)
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*/
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long referenceGenerationId =
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replicationServerDomain.getGenerationId();
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if ((referenceGenerationId > 0) &&
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(referenceGenerationId != handler.getGenerationId()))
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{
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logError(
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ERR_IGNORING_UPDATE_FROM_RS.get(
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Integer.toString(
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replicationServerDomain.getReplicationServer().
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getServerId()),
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replicationServerDomain.getBaseDn(),
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((UpdateMsg) msg).getChangeNumber().toString(),
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Integer.toString(handler.getServerId()),
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Long.toString(referenceGenerationId),
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Long.toString(handler.getGenerationId())));
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filtered = true;
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}
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}
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if (!filtered)
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{
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UpdateMsg update = (UpdateMsg) msg;
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handler.decAndCheckWindow();
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replicationServerDomain.put(update, handler);
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}
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} else if (msg instanceof WindowMsg)
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{
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WindowMsg windowMsg = (WindowMsg) msg;
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handler.updateWindow(windowMsg);
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} else if (msg instanceof InitializeRequestMsg)
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{
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InitializeRequestMsg initializeMsg =
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(InitializeRequestMsg) msg;
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handler.process(initializeMsg);
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} else if (msg instanceof InitializeTargetMsg)
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{
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InitializeTargetMsg initializeMsg = (InitializeTargetMsg) msg;
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handler.process(initializeMsg);
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} else if (msg instanceof EntryMsg)
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{
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EntryMsg entryMsg = (EntryMsg) msg;
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handler.process(entryMsg);
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} else if (msg instanceof DoneMsg)
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{
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DoneMsg doneMsg = (DoneMsg) msg;
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handler.process(doneMsg);
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} else if (msg instanceof ErrorMsg)
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{
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ErrorMsg errorMsg = (ErrorMsg) msg;
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handler.process(errorMsg);
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} else if (msg instanceof ResetGenerationIdMsg)
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{
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ResetGenerationIdMsg genIdMsg = (ResetGenerationIdMsg) msg;
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replicationServerDomain.resetGenerationId(handler, genIdMsg);
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} else if (msg instanceof WindowProbeMsg)
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{
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WindowProbeMsg windowProbeMsg = (WindowProbeMsg) msg;
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handler.process(windowProbeMsg);
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} else if (msg instanceof TopologyMsg)
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{
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TopologyMsg topoMsg = (TopologyMsg) msg;
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try
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{
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ReplicationServerHandler rsh = (ReplicationServerHandler)handler;
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replicationServerDomain.receiveTopoInfoFromRS(topoMsg,
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rsh, true);
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}
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catch(Exception e)
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{
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errMessage =
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ERR_REPLICATION_PROTOCOL_MESSAGE_TYPE.get(
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"TopologyMsg", "other");
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logError(errMessage);
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}
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} else if (msg instanceof ChangeStatusMsg)
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{
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ChangeStatusMsg csMsg = (ChangeStatusMsg) msg;
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try
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{
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DataServerHandler dsh = (DataServerHandler)handler;
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replicationServerDomain.processNewStatus(dsh, csMsg);
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}
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catch(Exception e)
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{
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errMessage =
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ERR_RECEIVED_CHANGE_STATUS_NOT_FROM_DS.get(
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replicationServerDomain.getBaseDn(),
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Integer.toString(handler.getServerId()),
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csMsg.toString());
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logError(errMessage);
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}
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} else if (msg instanceof MonitorRequestMsg)
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{
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MonitorRequestMsg replServerMonitorRequestMsg =
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(MonitorRequestMsg) msg;
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handler.process(replServerMonitorRequestMsg);
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} else if (msg instanceof MonitorMsg)
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{
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MonitorMsg replServerMonitorMsg = (MonitorMsg) msg;
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handler.process(replServerMonitorMsg);
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} else if (msg instanceof ChangeTimeHeartbeatMsg)
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{
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ChangeTimeHeartbeatMsg cthbMsg = (ChangeTimeHeartbeatMsg) msg;
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replicationServerDomain.processChangeTimeHeartbeatMsg(handler,
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cthbMsg);
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} else if (msg instanceof StopMsg)
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{
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// Peer server is properly disconnecting: go out of here to
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// properly close the server handler going to finally block.
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if (debugEnabled())
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{
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TRACER.debugInfo(handler.toString() + " has properly " +
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"disconnected from this replication server " +
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Integer.toString(replicationServerDomain.getReplicationServer().
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getServerId()));
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}
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return;
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} else if (msg == null)
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{
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/*
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* The remote server has sent an unknown message,
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* close the conenction.
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*/
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errMessage = NOTE_READER_NULL_MSG.get(handler.toString());
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logError(errMessage);
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return;
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}
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} catch (NotSupportedOldVersionPDUException e)
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{
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// Received a V1 PDU we do not need to support:
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// we just trash the message and log the event for debug purpose,
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// then continue receiving messages.
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if (debugEnabled())
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TRACER.debugInfo("In " + replicationServerDomain.
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getReplicationServer().
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getMonitorInstanceName() + ":" + e.getMessage());
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}
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}
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}
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catch (IOException e)
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{
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/*
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* The connection has been broken
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* Log a message and exit from this loop
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* So that this handler is stopped.
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*/
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if (debugEnabled())
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TRACER.debugInfo(
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"In RS " + replicationServerDomain.getReplicationServer().
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getMonitorInstanceName() +
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" reader IO EXCEPTION for serverID=" + serverId + " " +
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this + " " +
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stackTraceToSingleLineString(e) + " " + e.getLocalizedMessage());
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errMessage = ERR_SERVER_BADLY_DISCONNECTED.get(handler.toString(),
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Integer.toString(replicationServerDomain.
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getReplicationServer().getServerId()));
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logError(errMessage);
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}
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catch (ClassNotFoundException e)
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{
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if (debugEnabled())
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TRACER.debugInfo(
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"In RS <" + replicationServerDomain.getReplicationServer().
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getMonitorInstanceName() +
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" reader CNF EXCEPTION serverID=" + serverId +
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stackTraceToSingleLineString(e));
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/*
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* The remote server has sent an unknown message,
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* close the connection.
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*/
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errMessage = ERR_UNKNOWN_MESSAGE.get(handler.toString());
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logError(errMessage);
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}
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catch (Exception e)
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{
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if (debugEnabled())
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TRACER.debugInfo(
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"In RS <" + replicationServerDomain.getReplicationServer().
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getMonitorInstanceName() +
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" server reader EXCEPTION serverID=" + serverId +
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" " + stackTraceToSingleLineString(e));
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/*
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* The remote server has sent an unknown message,
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* close the connection.
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*/
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errMessage = NOTE_READER_EXCEPTION.get(handler.toString());
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logError(errMessage);
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}
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finally
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{
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/*
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* The thread only exits the loop above if some error condition
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* happen.
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* Attempt to close the socket and stop the server handler.
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*/
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try
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{
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if (debugEnabled())
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TRACER.debugInfo(
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"In RS " + replicationServerDomain.getReplicationServer().
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getMonitorInstanceName() +
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this + " is closing the session");
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if (handler.getProtocolVersion() >=
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ProtocolVersion.REPLICATION_PROTOCOL_V4)
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{
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// V4 protocol introduces a StopMsg to properly end
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// communications
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try
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{
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session.publish(new StopMsg());
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} catch (IOException ioe)
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{
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// Anyway, going to close session, so nothing to do
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}
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}
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session.close();
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} catch (IOException e)
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{
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// ignore
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}
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replicationServerDomain.stopServer(handler);
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if (debugEnabled())
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{
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TRACER.debugInfo(this.getName() + " stopped " + errMessage);
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}
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}
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}
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}
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