/*
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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 2006-2010 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.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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import static org.opends.messages.ReplicationMessages.*;
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import static org.opends.server.loggers.ErrorLogger.*;
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import static org.opends.server.loggers.debug.DebugLogger.*;
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import static org.opends.server.replication.common.ServerStatus.*;
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import static org.opends.server.util.StaticUtils.*;
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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 final Session session;
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private final ServerHandler handler;
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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
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* The Session from which to read the data.
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* @param handler
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* The server handler for this server reader.
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*/
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public ServerReader(Session session, ServerHandler handler)
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{
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super("Replication server RS(" + handler.getReplicationServerId()
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+ ") reading from " + handler + " at "
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+ session.getReadableRemoteAddress());
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this.session = session;
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this.handler = handler;
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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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@Override
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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(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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Message 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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try
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{
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final ReplicationMsg msg = session.receive();
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if (debugEnabled())
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{
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TRACER.debugInfo("In " + getName() + " receives " + msg);
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}
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if (msg instanceof AckMsg)
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{
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handler.checkWindow();
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handler.processAck((AckMsg) msg);
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}
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else if (msg instanceof UpdateMsg)
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{
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final UpdateMsg updateMsg = (UpdateMsg) msg;
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if (!isUpdateMsgFiltered(updateMsg))
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{
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handler.put(updateMsg);
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}
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}
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else if (msg instanceof WindowMsg)
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{
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handler.updateWindow((WindowMsg) msg);
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}
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else if (msg instanceof MonitorRequestMsg)
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{
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handler.processMonitorRequestMsg((MonitorRequestMsg) msg);
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}
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else if (msg instanceof MonitorMsg)
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{
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handler.processMonitorMsg((MonitorMsg) msg);
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}
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else if (msg instanceof RoutableMsg)
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{
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/*
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* Note that we handle monitor messages separately since they in
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* fact never need "routing" and are instead sent directly between
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* connected peers. Doing so allows us to more clearly decouple
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* write IO from the reader thread (see OPENDJ-1354).
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*/
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handler.process((RoutableMsg) msg);
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} else if (msg instanceof ResetGenerationIdMsg)
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{
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handler.processResetGenId((ResetGenerationIdMsg) msg);
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} else if (msg instanceof WindowProbeMsg)
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{
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handler.replyToWindowProbe();
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} else if (msg instanceof TopologyMsg)
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{
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ReplicationServerHandler rsh = (ReplicationServerHandler)handler;
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rsh.receiveTopoInfoFromRS((TopologyMsg) msg);
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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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dsh.receiveNewStatus(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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handler.getBaseDNString(),
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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 ChangeTimeHeartbeatMsg)
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{
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handler.process((ChangeTimeHeartbeatMsg) msg);
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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
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+ " has properly disconnected from this replication server "
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+ handler.getReplicationServerId());
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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, close the
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* connection.
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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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logException(e);
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}
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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 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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logException(e);
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if (!handler.shuttingDown())
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{
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errMessage = handler.getBadlyDisconnectedErrorMessage();
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logError(errMessage);
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}
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}
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catch (Exception e)
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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 connection.
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*/
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errMessage = NOTE_READER_EXCEPTION.get(
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handler.toString(), stackTraceToSingleLineString(e));
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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 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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{
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TRACER.debugInfo("In " + getName() + " closing the session");
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}
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session.close();
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handler.doStop();
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if (debugEnabled())
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{
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TRACER.debugInfo(getName() + " stopped: " + errMessage);
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}
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}
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}
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/**
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* Returns whether the update message is filtered in one of those cases:
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* <ul>
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* <li>Ignore updates from DS in bad BAD_GENID_STATUS or FULL_UPDATE_STATUS</li>
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* <li>Ignore updates from RS with bad gen id</li>
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* </ul>
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*/
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private boolean isUpdateMsgFiltered(UpdateMsg updateMsg)
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{
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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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final ServerStatus dsStatus = handler.getStatus();
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if (dsStatus == BAD_GEN_ID_STATUS)
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{
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logError(WARN_IGNORING_UPDATE_FROM_DS_BADGENID.get(
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handler.getReplicationServerId(),
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updateMsg.getCSN().toString(),
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handler.getBaseDNString(), handler.getServerId(),
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session.getReadableRemoteAddress(),
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handler.getGenerationId(),
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handler.getReferenceGenId()));
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return true;
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}
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else if (dsStatus == FULL_UPDATE_STATUS)
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{
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logError(WARN_IGNORING_UPDATE_FROM_DS_FULLUP.get(
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handler.getReplicationServerId(),
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updateMsg.getCSN().toString(),
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handler.getBaseDNString(), handler.getServerId(),
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session.getReadableRemoteAddress()));
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return true;
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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 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 = handler.getReferenceGenId();
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if (referenceGenerationId > 0
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&& referenceGenerationId != handler.getGenerationId())
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{
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logError(WARN_IGNORING_UPDATE_FROM_RS.get(
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handler.getReplicationServerId(),
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updateMsg.getCSN().toString(),
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handler.getBaseDNString(),
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handler.getServerId(),
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session.getReadableRemoteAddress(),
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handler.getGenerationId(),
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referenceGenerationId));
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return true;
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}
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}
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return false;
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}
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private void logException(Exception e)
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{
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if (debugEnabled())
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TRACER.debugInfo(
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"In " + getName() + " " + stackTraceToSingleLineString(e));
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}
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}
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