/*
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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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* Portions Copyright 2011 ForgeRock AS
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*/
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package org.opends.server.replication.server;
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import org.opends.messages.Message;
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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 static org.opends.messages.ReplicationMessages.*;
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import java.net.SocketException;
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import java.util.NoSuchElementException;
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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.ProtocolSession;
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import org.opends.server.replication.protocol.UpdateMsg;
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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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/**
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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 final ProtocolSession session;
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private final ServerHandler handler;
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private final ReplicationServerDomain replicationServerDomain;
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private final short protocolVersion;
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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 ProtocolSession 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(ProtocolSession 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("
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+ handler.getReplicationServerId()
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+ ") writing to "
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+ handler.toString()
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+ " at "
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+ ((session != null) ? session.getReadableRemoteAddress()
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: "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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// Keep protocol version locally for efficiency
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this.protocolVersion = handler.getProtocolVersion();
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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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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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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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errMessage = Message.raw(
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"Connection closure: null update returned by domain.");
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return; /* this connection is closing */
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}
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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 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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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_TO_DS_BADGENID.get(
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Integer.toString(replicationServerDomain.getReplicationServer().
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getServerId()),
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replicationServerDomain.getBaseDn(),
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update.getChangeNumber().toString(),
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Integer.toString(handler.getServerId()),
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Long.toString(handler.getGenerationId()),
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Long.toString(referenceGenerationId)));
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if (dsStatus == ServerStatus.FULL_UPDATE_STATUS)
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logError(ERR_IGNORING_UPDATE_TO_DS_FULLUP.get(
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Integer.toString(replicationServerDomain.getReplicationServer().
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getServerId()),
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replicationServerDomain.getBaseDn(),
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update.getChangeNumber().toString(),
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Integer.toString(handler.getServerId())));
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continue;
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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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long referenceGenerationId =
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replicationServerDomain.getGenerationId();
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if ((referenceGenerationId != handler.getGenerationId()) ||
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(referenceGenerationId == -1) || (handler.getGenerationId() == -1))
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{
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logError(ERR_IGNORING_UPDATE_TO_RS.get(
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Integer.toString(replicationServerDomain.getReplicationServer().
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getServerId()),
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replicationServerDomain.getBaseDn(),
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update.getChangeNumber().toString(),
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Integer.toString(handler.getServerId()),
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Long.toString(handler.getGenerationId()),
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Long.toString(referenceGenerationId)));
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continue;
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}
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}
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/*
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if (debugEnabled())
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{
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TRACER.debugInfo(
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"In " + replicationServerDomain.getReplicationServer().
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getMonitorInstanceName() +
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", writer to " + this.handler.getMonitorInstanceName() +
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" publishes msg=[" + update.toString() + "]"+
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" refgenId=" + referenceGenerationId +
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" isAssured=" + update.isAssured() +
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" server=" + handler.getServerId() +
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" generationId=" + handler.getGenerationId());
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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, protocolVersion);
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}
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}
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catch (NoSuchElementException 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 = 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 (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 = 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 (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.toString() +
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" " + stackTraceToSingleLineString(e));
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logError(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 (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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