/*
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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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* Portions Copyright 2006-2007 Sun Microsystems, Inc.
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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.io.IOException;
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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.protocol.ProtocolSession;
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import org.opends.server.replication.protocol.UpdateMessage;
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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 ProtocolSession session;
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private ServerHandler handler;
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private ReplicationCache replicationCache;
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private short serverId;
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/**
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* Create a ServerWriter.
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* Then ServerWriter then waits on the ServerHandler for new updates
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* and forward them to the server
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*
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* @param session the ProtocolSession that will be used to send updates.
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* @param serverId the Identifier of the server.
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* @param handler handler for which the ServerWriter is created.
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* @param replicationCache The ReplicationCache of this ServerWriter.
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*/
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public ServerWriter(ProtocolSession session, short serverId,
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ServerHandler handler, ReplicationCache replicationCache)
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{
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super(handler.toString() + " writer");
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this.serverId = serverId;
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this.session = session;
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this.handler = handler;
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this.replicationCache = replicationCache;
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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 ReplicationCache 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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if (debugEnabled())
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{
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if (handler.isReplicationServer())
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{
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TRACER.debugInfo("Replication server writer starting " + serverId);
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}
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else
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{
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TRACER.debugInfo("LDAP server writer starting " + serverId);
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}
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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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UpdateMessage update = replicationCache.take(this.handler);
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if (update == null)
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return; /* this connection is closing */
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// Ignore update to be sent to a replica with a bad generation ID
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long referenceGenerationId = replicationCache.getGenerationId();
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if (referenceGenerationId != handler.getGenerationId())
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{
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logError(ERR_IGNORING_UPDATE_TO.get(
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update.getDn(),
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this.handler.getMonitorInstanceName()));
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continue;
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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 " + replicationCache.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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" server=" + handler.getServerId() +
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" generationId=" + handler.getGenerationId());
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}
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session.publish(update);
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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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Message message = NOTE_SERVER_DISCONNECT.get(handler.toString());
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logError(message);
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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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Message message = NOTE_SERVER_DISCONNECT.get(handler.toString());
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logError(message);
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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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Message message = ERR_WRITER_UNEXPECTED_EXCEPTION.get(handler.toString() +
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" " + stackTraceToSingleLineString(e));
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logError(message);
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}
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finally {
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try
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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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// Can't do much more : ignore
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}
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replicationCache.stopServer(handler);
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if (debugEnabled())
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{
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if (handler.isReplicationServer())
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{
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TRACER.debugInfo("Replication server writer stopping " + serverId);
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}
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else
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{
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TRACER.debugInfo("LDAP server writer stopping " + serverId);
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}
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}
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}
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}
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}
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