/*
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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 2006-2008 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.messages.ReplicationMessages.*;
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import static org.opends.server.loggers.debug.DebugLogger.*;
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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.server.api.DirectoryThread;
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import org.opends.server.replication.protocol.AckMessage;
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import org.opends.server.replication.protocol.DoneMessage;
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import org.opends.server.replication.protocol.EntryMessage;
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import org.opends.server.replication.protocol.ErrorMessage;
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import org.opends.server.replication.protocol.ResetGenerationId;
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import org.opends.server.replication.protocol.InitializeRequestMessage;
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import org.opends.server.replication.protocol.InitializeTargetMessage;
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import org.opends.server.replication.protocol.ProtocolSession;
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import org.opends.server.replication.protocol.ReplicationMessage;
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import org.opends.server.replication.protocol.UpdateMessage;
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import org.opends.server.replication.protocol.WindowMessage;
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import org.opends.server.replication.protocol.WindowProbe;
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import org.opends.server.replication.protocol.ReplServerInfoMessage;
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import org.opends.server.replication.protocol.MonitorMessage;
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import org.opends.server.replication.protocol.MonitorRequestMessage;
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import org.opends.server.loggers.debug.DebugTracer;
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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 short 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, short serverId,
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ServerHandler handler,
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ReplicationServerDomain replicationServerDomain)
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{
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super(handler.toString() + " reader");
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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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if (debugEnabled())
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{
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TRACER.debugInfo(
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"In RS " + replicationServerDomain.getReplicationServer().
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getMonitorInstanceName() +
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(handler.isReplicationServer()?" RS ":" LS")+
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" reader starting for serverId=" + serverId);
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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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ReplicationMessage msg = session.receive();
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if (debugEnabled())
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{
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TRACER.debugInfo(
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"In RS " + replicationServerDomain.getReplicationServer().
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getMonitorInstanceName() +
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(handler.isReplicationServer()?" From RS ":" From LS")+
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" with serverId=" + serverId + " receives " + msg);
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}
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if (msg instanceof AckMessage)
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{
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AckMessage ack = (AckMessage) msg;
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handler.checkWindow();
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replicationServerDomain.ack(ack, serverId);
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}
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else if (msg instanceof UpdateMessage)
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{
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// Ignore update received from a replica with
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// a bad generation ID
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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(ERR_IGNORING_UPDATE_FROM.get(
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msg.toString(),
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handler.getMonitorInstanceName()));
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}
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else
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{
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UpdateMessage update = (UpdateMessage) msg;
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handler.decAndCheckWindow();
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replicationServerDomain.put(update, handler);
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}
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}
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else if (msg instanceof WindowMessage)
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{
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WindowMessage windowMsg = (WindowMessage) msg;
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handler.updateWindow(windowMsg);
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}
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else if (msg instanceof InitializeRequestMessage)
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{
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InitializeRequestMessage initializeMsg =
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(InitializeRequestMessage) msg;
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handler.process(initializeMsg);
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}
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else if (msg instanceof InitializeTargetMessage)
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{
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InitializeTargetMessage initializeMsg = (InitializeTargetMessage) msg;
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handler.process(initializeMsg);
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}
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else if (msg instanceof EntryMessage)
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{
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EntryMessage entryMsg = (EntryMessage) msg;
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handler.process(entryMsg);
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}
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else if (msg instanceof DoneMessage)
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{
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DoneMessage doneMsg = (DoneMessage) msg;
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handler.process(doneMsg);
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}
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else if (msg instanceof ErrorMessage)
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{
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ErrorMessage errorMsg = (ErrorMessage) msg;
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handler.process(errorMsg);
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}
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else if (msg instanceof ResetGenerationId)
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{
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ResetGenerationId genIdMsg = (ResetGenerationId) msg;
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replicationServerDomain.resetGenerationId(this.handler, genIdMsg);
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}
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else if (msg instanceof WindowProbe)
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{
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WindowProbe windowProbeMsg = (WindowProbe) msg;
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handler.process(windowProbeMsg);
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}
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else if (msg instanceof ReplServerInfoMessage)
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{
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ReplServerInfoMessage infoMsg = (ReplServerInfoMessage)msg;
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handler.receiveReplServerInfo(infoMsg);
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replicationServerDomain.receiveReplServerInfo(infoMsg, handler);
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}
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else if (msg instanceof MonitorRequestMessage)
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{
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MonitorRequestMessage replServerMonitorRequestMsg =
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(MonitorRequestMessage) msg;
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handler.process(replServerMonitorRequestMsg);
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}
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else if (msg instanceof MonitorMessage)
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{
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MonitorMessage replServerMonitorMsg = (MonitorMessage) msg;
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handler.process(replServerMonitorMsg);
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}
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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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Message message = NOTE_READER_NULL_MSG.get(handler.toString());
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logError(message);
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return;
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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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+ stackTraceToSingleLineString(e) + " " + e.getLocalizedMessage());
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Message message = NOTE_SERVER_DISCONNECT.get(handler.toString());
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logError(message);
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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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Message message = ERR_UNKNOWN_MESSAGE.get(handler.toString());
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logError(message);
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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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Message message = NOTE_READER_EXCEPTION.get(handler.toString());
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logError(message);
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}
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finally
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{
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/*
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* The thread only exit the loop above is 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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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 for serverID=" + serverId +
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" is closing the session");
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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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// ignore
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}
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replicationServerDomain.stopServer(handler);
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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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(handler.isReplicationServer()?" RS":" LDAP") +
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" server reader stopped for serverID=" + serverId);
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}
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}
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