/*
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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 Sun Microsystems, Inc.
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*/
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package org.opends.server.synchronization.changelog;
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import static org.opends.server.loggers.Error.logError;
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import static org.opends.server.messages.MessageHandler.getMessage;
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import static org.opends.server.synchronization.common.LogMessages.*;
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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.synchronization.protocol.AckMessage;
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import org.opends.server.synchronization.protocol.ProtocolSession;
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import org.opends.server.synchronization.protocol.SynchronizationMessage;
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import org.opends.server.synchronization.protocol.UpdateMessage;
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import org.opends.server.synchronization.protocol.WindowMessage;
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import org.opends.server.types.ErrorLogCategory;
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import org.opends.server.types.ErrorLogSeverity;
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/**
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* This class implement the part of the changelog 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 changelog 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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private short serverId;
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private ProtocolSession session;
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private ServerHandler handler;
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private ChangelogCache changelogCache;
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/**
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* Constructor for the LDAP server reader part of the changelog.
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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 changes.
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* @param handler The server handler for this server reader.
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* @param changelogCache The ChangelogCache for this server reader.
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*/
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public ServerReader(ProtocolSession session, short serverId,
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ServerHandler handler, ChangelogCache changelogCache)
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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.changelogCache = changelogCache;
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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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/*
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* TODO : catch exceptions in case of bugs
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* wait on input stream
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* grab all incoming messages and publish them to the changelogCache
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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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SynchronizationMessage msg = session.receive();
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if (msg == null)
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{
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// TODO : generate error in the log
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// make sure that connection is closed
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return;
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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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changelogCache.ack(ack, serverId);
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}
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else if (msg instanceof UpdateMessage)
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{
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UpdateMessage update = (UpdateMessage) msg;
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handler.checkWindow();
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changelogCache.put(update, handler);
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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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}
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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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int msgID = MSGID_SERVER_DISCONNECT;
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String message = getMessage(msgID, handler.toString());
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logError(ErrorLogCategory.SYNCHRONIZATION,
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ErrorLogSeverity.NOTICE,
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message, msgID);
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} catch (ClassNotFoundException 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 conenction.
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*/
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int msgID = MSGID_UNKNOWN_MESSAGE;
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String message = getMessage(msgID, handler.toString());
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logError(ErrorLogCategory.SYNCHRONIZATION,
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ErrorLogSeverity.NOTICE,
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message, msgID);
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} catch (Exception e)
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{
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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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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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changelogCache.stopServer(handler);
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}
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}
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}
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