/*
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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 legal-notices/CDDLv1_0.txt
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* or http://forgerock.org/license/CDDLv1.0.html.
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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 legal-notices/CDDLv1_0.txt.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* 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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* Portions Copyright 2011-2014 ForgeRock AS
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*/
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package org.opends.server.replication.server;
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import java.net.SocketException;
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import org.forgerock.i18n.LocalizableMessage;
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import org.opends.server.api.DirectoryThread;
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import org.forgerock.i18n.slf4j.LocalizedLogger;
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import org.opends.server.replication.common.ServerStatus;
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import org.opends.server.replication.protocol.Session;
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import org.opends.server.replication.protocol.UpdateMsg;
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import static org.opends.messages.ReplicationMessages.*;
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import static org.opends.server.util.StaticUtils.*;
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/**
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* This class defines a server writer, which is used to send changes to a
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* directory server.
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*/
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public class ServerWriter extends DirectoryThread
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{
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private static final LocalizedLogger logger = LocalizedLogger.getLoggerForThisClass();
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private final Session session;
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private final ServerHandler handler;
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private final ReplicationServerDomain replicationServerDomain;
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/**
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* Create a ServerWriter. Then ServerWriter then waits on the ServerHandler
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* for new updates and forward them to the server
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*
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* @param session
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* the Session that will be used to send updates.
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* @param handler
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* handler for which the ServerWriter is created.
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* @param replicationServerDomain
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* The ReplicationServerDomain of this ServerWriter.
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*/
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public ServerWriter(Session session, ServerHandler handler,
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ReplicationServerDomain replicationServerDomain)
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{
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// Session may be null for ECLServerWriter.
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super("Replication server RS(" + handler.getReplicationServerId()
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+ ") writing to " + handler + " at "
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+ (session != null ? session.getReadableRemoteAddress() : "unknown"));
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this.session = session;
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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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* Run method for the ServerWriter.
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* Loops waiting for changes from the ReplicationServerDomain and forward them
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* to the other servers
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*/
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@Override
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public void run()
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{
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if (logger.isTraceEnabled())
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{
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logger.trace(getName() + " starting");
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}
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LocalizableMessage errMessage = null;
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try
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{
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while (true)
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{
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UpdateMsg update = replicationServerDomain.take(this.handler);
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if (update == null)
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{
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// this connection is closing
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errMessage = LocalizableMessage.raw(
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"Connection closure: null update returned by domain.");
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return;
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}
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// Ignore updates in some cases
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long referenceGenerationId = replicationServerDomain.getGenerationId();
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if (handler.isDataServer())
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{
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/**
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* Ignore updates to DS in bad BAD_GENID_STATUS or FULL_UPDATE_STATUS
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*
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* The RSD lock should not be taken here as it is acceptable to have a
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* delay between the time the server has a wrong status and the fact
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* we detect it: the updates that succeed to pass during this time
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* will have no impact on remote server. But it is interesting to not
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* saturate uselessly the network if the updates are not necessary so
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* this check to stop sending updates is interesting anyway. Not
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* taking the RSD lock allows to have better performances in normal
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* 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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if (dsStatus == ServerStatus.BAD_GEN_ID_STATUS)
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{
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logger.warn(WARN_IGNORING_UPDATE_TO_DS_BADGENID.get(handler.getReplicationServerId(),
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update.getCSN(), handler.getBaseDN(), handler.getServerId(),
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session.getReadableRemoteAddress(),
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handler.getGenerationId(),
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referenceGenerationId));
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}
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else if (dsStatus == ServerStatus.FULL_UPDATE_STATUS)
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{
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logger.warn(WARN_IGNORING_UPDATE_TO_DS_FULLUP.get(handler.getReplicationServerId(),
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update.getCSN(), handler.getBaseDN(), handler.getServerId(),
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session.getReadableRemoteAddress()));
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}
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continue;
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}
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}
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else
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{
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/**
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* Ignore updates to RS with bad gen id
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* (no system managed status for a RS)
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*/
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if (referenceGenerationId != handler.getGenerationId()
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|| referenceGenerationId == -1
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|| handler.getGenerationId() == -1)
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{
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logger.error(WARN_IGNORING_UPDATE_TO_RS.get(
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handler.getReplicationServerId(),
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update.getCSN(), handler.getBaseDN(), handler.getServerId(),
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session.getReadableRemoteAddress(),
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handler.getGenerationId(),
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referenceGenerationId));
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continue;
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}
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}
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// Publish the update to the remote server using a protocol version he
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// it supports
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session.publish(update);
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}
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}
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catch (SocketException e)
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{
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/*
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* The remote host has disconnected and this particular Tree is going to
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* be removed, just ignore the exception and let the thread die as well
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*/
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errMessage = handler.getBadlyDisconnectedErrorMessage();
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logger.error(errMessage);
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}
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catch (Exception e)
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{
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/*
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* An unexpected error happened.
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* Log an error and close the connection.
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*/
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errMessage = ERR_WRITER_UNEXPECTED_EXCEPTION.get(handler +
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" " + stackTraceToSingleLineString(e));
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logger.error(errMessage);
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}
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finally {
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session.close();
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replicationServerDomain.stopServer(handler, false);
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if (logger.isTraceEnabled())
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{
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logger.trace(getName() + " stopped " + errMessage);
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}
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}
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}
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}
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