/*
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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;
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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.SynchMessages.*;
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import static org.opends.server.util.StaticUtils.stackTraceToSingleLineString;
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import java.util.LinkedHashSet;
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import java.util.List;
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import java.util.TreeSet;
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import java.io.IOException;
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import java.net.ConnectException;
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import java.net.InetAddress;
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import java.net.InetSocketAddress;
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import java.net.Socket;
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import org.opends.server.changelog.ProtocolSession;
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import org.opends.server.changelog.SocketSession;
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import org.opends.server.protocols.asn1.ASN1OctetString;
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import org.opends.server.protocols.internal.InternalClientConnection;
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import org.opends.server.protocols.internal.InternalSearchListener;
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import org.opends.server.protocols.internal.InternalSearchOperation;
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import org.opends.server.protocols.ldap.LDAPFilter;
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import org.opends.server.types.DereferencePolicy;
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import org.opends.server.types.ErrorLogCategory;
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import org.opends.server.types.ErrorLogSeverity;
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import org.opends.server.types.ResultCode;
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import org.opends.server.types.SearchResultEntry;
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import org.opends.server.types.SearchResultReference;
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import org.opends.server.types.SearchScope;
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/**
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* The broker for Multimaster Synchronization.
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*/
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public class ChangelogBroker implements InternalSearchListener
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{
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private boolean shutdown = false;
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private List<String> servers;
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private Short identifier;
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private boolean connected = false;
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private SynchronizationDomain domain;
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private final Object lock = new Object();
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private String changelogServer = "Not connected";
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private TreeSet<FakeOperation> replayOperations;
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private ProtocolSession session = null;
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/**
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* Creates a new Changelog Broker for a particular SynchronizationDomain.
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*
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* @param domain The SynchronizationDomain for which the borker is created.
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*/
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public ChangelogBroker(SynchronizationDomain domain)
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{
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this.domain = domain;
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replayOperations =
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new TreeSet<FakeOperation>(new FakeOperationComparator());
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}
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/**
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* Start the ChangelogBroker.
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*
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* @param identifier identifier of the changelog
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* @param servers list of servers used
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* @throws Exception : in case of errors
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*/
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public void start(Short identifier,
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List<String> servers)
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throws Exception
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{
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/*
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* Open Socket to the Changelog
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* Send the Start message
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*/
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this.identifier = identifier;
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this.servers = servers;
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if (servers.size() < 1)
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{
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int msgID = MSGID_NEED_MORE_THAN_ONE_CHANGELOG_SERVER;
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String message = getMessage(msgID);
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logError(ErrorLogCategory.SYNCHRONIZATION,
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ErrorLogSeverity.NOTICE,
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message, msgID);
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}
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this.connect();
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}
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/**
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* Connect the Changelog server to other servers.
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*
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* @throws NumberFormatException address was invalid
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* @throws IOException error during connection phase
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*/
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private void connect() throws NumberFormatException, IOException
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{
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ChangelogStartMessage startMsg;
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boolean checkState = true;
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while( !connected)
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{
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for (String server : servers)
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{
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String token[] = server.split(":");
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String hostname = token[0];
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String port = token[1];
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try
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{
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/*
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* Open a socket connection to the next candidate.
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*/
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InetSocketAddress ServerAddr = new InetSocketAddress(
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InetAddress.getByName(hostname), Integer.parseInt(port));
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Socket socket = new Socket();
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socket.connect(ServerAddr, 500);
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session = new SocketSession(socket);
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/*
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* Send our ServerStartMessage.
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*/
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ServerStartMessage msg = domain.newServerStartMessage();
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session.publish(msg);
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/*
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* Read the ChangelogStartMessage that should come back.
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* TODO : should have a timeout here.
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*/
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startMsg = (ChangelogStartMessage) session.receive();
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/*
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* We must not publish changes to a changelog that has not
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* seen all our previous changes because this could cause some
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* other ldap servers to miss those changes.
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* Check that the Changelog has seen all our previous changes.
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* If not, try another changelog server.
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* If no other changelog server has seen all our changes, recover
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* those changes and send them again to any changelog server.
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*/
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ChangeNumber changelogMaxChangeNumber =
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startMsg.getServerState().getMaxChangeNumber(identifier);
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if (changelogMaxChangeNumber == null)
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changelogMaxChangeNumber = new ChangeNumber(0, 0, identifier);
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ChangeNumber ourMaxChangeNumber = domain.getMaxChangeNumber();
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if ((ourMaxChangeNumber == null) ||
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(ourMaxChangeNumber.olderOrEqual(changelogMaxChangeNumber)))
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{
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changelogServer = ServerAddr.toString();
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connected = true;
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break;
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}
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else
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{
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if (checkState == true)
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{
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/* This changelog server is missing some
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* of our changes, we are going to try another server
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* but before log a notice message
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*/
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int msgID = MSGID_CHANGELOG_MISSING_CHANGES;
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String message = getMessage(msgID, server);
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logError(ErrorLogCategory.SYNCHRONIZATION,
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ErrorLogSeverity.NOTICE,
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message, msgID);
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}
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else
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{
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replayOperations.clear();
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/*
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* Get all the changes that have not been seen by this changelog
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* server and update it
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*/
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InternalClientConnection conn = new InternalClientConnection();
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LDAPFilter filter = LDAPFilter.decode(
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"("+ Historical.HISTORICALATTRIBUTENAME +
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">=dummy:" + changelogMaxChangeNumber + ")");
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LinkedHashSet<String> attrs = new LinkedHashSet<String>(1);
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attrs.add(Historical.HISTORICALATTRIBUTENAME);
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InternalSearchOperation op = conn.processSearch(
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new ASN1OctetString(domain.getBaseDN().toString()),
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SearchScope.WHOLE_SUBTREE,
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DereferencePolicy.NEVER_DEREF_ALIASES,
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0, 0, false, filter,
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attrs, this);
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if (op.getResultCode() != ResultCode.SUCCESS)
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{
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/*
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* An error happened trying to search for the updates
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* This server therefore can't start acepting new updates.
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* TODO : should stop the LDAP server (how to ?)
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*/
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int msgID = MSGID_CANNOT_RECOVER_CHANGES;
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String message = getMessage(msgID);
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logError(ErrorLogCategory.SYNCHRONIZATION,
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ErrorLogSeverity.FATAL_ERROR,
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message, msgID);
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}
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else
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{
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changelogServer = ServerAddr.toString();
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connected = true;
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for (FakeOperation replayOp : replayOperations)
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{
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publish(replayOp.generateMessage());
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}
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break;
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}
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}
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}
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}
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catch (ConnectException e)
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{
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/*
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* There was no server waiting on this host:port
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* Log a notice and try the next changelog server in the list
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*/
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int msgID = MSGID_NO_CHANGELOG_SERVER_LISTENING;
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String message = getMessage(msgID, server);
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logError(ErrorLogCategory.SYNCHRONIZATION,
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ErrorLogSeverity.NOTICE,
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message, msgID);
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}
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catch (Exception e)
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{
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int msgID = MSGID_EXCEPTION_STARTING_SESSION;
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String message = getMessage(msgID) + stackTraceToSingleLineString(e);
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logError(ErrorLogCategory.SYNCHRONIZATION,
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ErrorLogSeverity.SEVERE_ERROR,
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message, msgID);
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}
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finally
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{
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if (connected == false)
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{
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if (session != null)
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{
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session.close();
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session = null;
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}
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}
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}
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}
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if (!connected)
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{
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if (checkState == true)
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{
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/*
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* We could not find a changelog server that has seen all the
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* changes that this server has already processed, start again
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* the loop looking for any changelog server.
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*/
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checkState = false;
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int msgID = MSGID_COULD_NOT_FIND_CHANGELOG_WITH_MY_CHANGES;
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String message = getMessage(msgID);
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logError(ErrorLogCategory.SYNCHRONIZATION,
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ErrorLogSeverity.NOTICE,
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message, msgID);
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}
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else
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{
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/*
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* This server could not find any changelog server
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* Let's wait a little and try again.
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*/
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synchronized (this)
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{
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checkState = false;
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int msgID = MSGID_COULD_NOT_FIND_CHANGELOG;
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String message = getMessage(msgID);
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logError(ErrorLogCategory.SYNCHRONIZATION,
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ErrorLogSeverity.NOTICE,
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message, msgID);
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try
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{
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this.wait(1000);
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} catch (InterruptedException e)
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{
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}
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}
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}
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}
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}
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}
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/**
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* Restart the Changelog broker after a failure.
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*
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* @param failingSession the socket which failed
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*/
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private void reStart(ProtocolSession failingSession)
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{
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try
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{
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failingSession.close();
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} catch (IOException e1)
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{
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// ignore
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}
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if (failingSession == session)
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{
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this.connected = false;
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}
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while (!this.connected && (!this.shutdown))
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{
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try
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{
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this.connect();
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} catch (Exception e)
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{
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int msgID = MSGID_EXCEPTION_STARTING_SESSION;
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String message = getMessage(msgID) + stackTraceToSingleLineString(e);
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logError(ErrorLogCategory.SYNCHRONIZATION,
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ErrorLogSeverity.SEVERE_ERROR,
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message, msgID);
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}
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}
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}
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/**
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* Publish a message to the other servers.
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* @param msg the message to publish
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*/
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public void publish(SynchronizationMessage msg)
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{
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boolean done = false;
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ProtocolSession failingSession = session;
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while (!done)
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{
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synchronized (lock)
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{
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try
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{
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if (this.connected == false)
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this.reStart(failingSession);
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session.publish(msg);
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done = true;
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} catch (IOException e)
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{
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this.reStart(failingSession);
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}
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}
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}
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}
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/**
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* Receive a message.
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* @return the received message
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*/
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public SynchronizationMessage receive()
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{
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while (shutdown == false)
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{
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ProtocolSession failingSession = session;
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try
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{
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return session.receive();
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} catch (Exception e)
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{
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if (shutdown == false)
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{
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synchronized (lock)
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{
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this.reStart(failingSession);
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}
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}
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}
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}
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return null;
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}
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/**
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* stop the server.
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*/
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public void stop()
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{
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shutdown = true;
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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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}
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/**
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* restart the server after a suspension.
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* @throws Exception in case of errors.
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*/
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public void restartReceive() throws Exception
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{
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// TODO Auto-generated method stub
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}
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/**
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* Suspend message reception.
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* @throws Exception in case of errors.
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*/
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public void suspendReceive() throws Exception
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{
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// TODO Auto-generated method stub
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}
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/**
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* Get the name of the changelog server to which this broker is currently
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* connected.
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*
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* @return the name of the changelog server to which this domain
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* is currently connected.
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*/
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public String getChangelogServer()
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{
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return changelogServer;
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}
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/**
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* {@inheritDoc}
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*/
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public void handleInternalSearchEntry(
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InternalSearchOperation searchOperation,
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SearchResultEntry searchEntry)
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{
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/*
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* Only deal with modify operation so far
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* TODO : implement code for ADD, DEL, MODDN operation
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*
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* Parse all ds-sync-hist attribute values
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* - for each Changenumber>changelogMaxChangeNumber :
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* build an attribute mod
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*
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*/
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Iterable<FakeOperation> updates =
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Historical.generateFakeOperations(searchEntry);
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for (FakeOperation op : updates)
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{
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replayOperations.add(op);
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}
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}
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/**
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* {@inheritDoc}
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*/
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public void handleInternalSearchReference(
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InternalSearchOperation searchOperation,
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SearchResultReference searchReference)
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{
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// TODO to be implemented
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}
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}
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