/*
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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
|
* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Portions Copyright 2006-2007 Sun Microsystems, Inc.
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*/
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package org.opends.server.replication.plugin;
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import org.opends.messages.Message;
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import org.opends.messages.MessageBuilder;
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import static org.opends.server.loggers.ErrorLogger.logError;
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import static org.opends.server.loggers.debug.DebugLogger.*;
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import org.opends.server.loggers.debug.DebugTracer;
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import static org.opends.messages.ReplicationMessages.*;
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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 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 java.net.SocketException;
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import java.net.SocketTimeoutException;
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import java.util.Collection;
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import java.util.LinkedHashSet;
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import java.util.TreeSet;
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import java.util.concurrent.Semaphore;
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import java.util.concurrent.TimeUnit;
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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.replication.common.ChangeNumber;
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import org.opends.server.replication.common.ServerState;
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import org.opends.server.replication.protocol.*;
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import org.opends.server.types.DN;
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import org.opends.server.types.DereferencePolicy;
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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 Multi-master Replication.
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*/
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public class ReplicationBroker implements InternalSearchListener
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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 boolean shutdown = false;
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private Collection<String> servers;
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private boolean connected = false;
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private String replicationServer = "Not connected";
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private TreeSet<FakeOperation> replayOperations;
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private ProtocolSession session = null;
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private final ServerState state;
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private final DN baseDn;
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private final short serverID;
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private int maxSendDelay;
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private int maxReceiveDelay;
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private int maxSendQueue;
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private int maxReceiveQueue;
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private Semaphore sendWindow;
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private int maxSendWindow;
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private int rcvWindow;
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private int halfRcvWindow;
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private int maxRcvWindow;
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private int timeout = 0;
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private short protocolVersion;
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private ReplSessionSecurity replSessionSecurity;
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/**
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* The time in milliseconds between heartbeats from the replication
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* server. Zero means heartbeats are off.
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*/
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private long heartbeatInterval = 0;
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/**
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* A thread to monitor heartbeats on the session.
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*/
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private HeartbeatMonitor heartbeatMonitor = null;
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/**
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* The number of times the connection was lost.
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*/
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private int numLostConnections = 0;
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/**
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* When the broker cannot connect to any replication server
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* it log an error and keeps continuing every second.
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* This boolean is set when the first failure happens and is used
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* to avoid repeating the error message for further failure to connect
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* and to know that it is necessary to print a new message when the broker
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* finally succeed to connect.
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*/
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private boolean connectionError = false;
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private Object connectPhaseLock = new Object();
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/**
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* Creates a new ReplicationServer Broker for a particular ReplicationDomain.
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*
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* @param state The ServerState that should be used by this broker
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* when negociating the session with the replicationServer.
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* @param baseDn The base DN that should be used by this broker
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* when negociating the session with the replicationServer.
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* @param serverID The server ID that should be used by this broker
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* when negociating the session with the replicationServer.
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* @param maxReceiveQueue The maximum size of the receive queue to use on
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* the replicationServer.
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* @param maxReceiveDelay The maximum replication delay to use on the
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* replicationServer.
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* @param maxSendQueue The maximum size of the send queue to use on
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* the replicationServer.
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* @param maxSendDelay The maximum send delay to use on the replicationServer.
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* @param window The size of the send and receive window to use.
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* @param heartbeatInterval The interval between heartbeats requested of the
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* replicationServer, or zero if no heartbeats are requested.
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* @param replSessionSecurity The session security configuration.
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*/
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public ReplicationBroker(ServerState state, DN baseDn, short serverID,
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int maxReceiveQueue, int maxReceiveDelay, int maxSendQueue,
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int maxSendDelay, int window, long heartbeatInterval,
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ReplSessionSecurity replSessionSecurity)
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{
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this.baseDn = baseDn;
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this.serverID = serverID;
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this.maxReceiveDelay = maxReceiveDelay;
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this.maxSendDelay = maxSendDelay;
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this.maxReceiveQueue = maxReceiveQueue;
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this.maxSendQueue = maxSendQueue;
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this.state = state;
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replayOperations =
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new TreeSet<FakeOperation>(new FakeOperationComparator());
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this.rcvWindow = window;
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this.maxRcvWindow = window;
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this.halfRcvWindow = window/2;
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this.heartbeatInterval = heartbeatInterval;
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this.protocolVersion = ProtocolVersion.currentVersion();
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this.replSessionSecurity = replSessionSecurity;
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}
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/**
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* Start the ReplicationBroker.
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*
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* @param servers list of servers used
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*/
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public void start(Collection<String> servers)
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{
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/*
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* Open Socket to the ReplicationServer
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* Send the Start message
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*/
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shutdown = false;
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this.servers = servers;
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if (servers.size() < 1)
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{
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Message message = NOTE_NEED_MORE_THAN_ONE_CHANGELOG_SERVER.get();
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logError(message);
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}
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this.rcvWindow = this.maxRcvWindow;
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this.connect();
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}
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/**
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* Connect to a ReplicationServer.
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*
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* @throws NumberFormatException address was invalid
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*/
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private void connect()
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{
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ReplServerStartMessage startMsg;
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// Stop any existing heartbeat monitor from a previous session.
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if (heartbeatMonitor != null)
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{
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heartbeatMonitor.shutdown();
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heartbeatMonitor = null;
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}
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boolean checkState = true;
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boolean receivedResponse = true;
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synchronized (connectPhaseLock)
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{
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while ((!connected) && (!shutdown) && (receivedResponse))
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{
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receivedResponse = false;
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for (String server : servers)
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{
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int separator = server.lastIndexOf(':');
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String port = server.substring(separator + 1);
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String hostname = server.substring(0, separator);
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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.setReceiveBufferSize(1000000);
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socket.setTcpNoDelay(true);
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socket.connect(ServerAddr, 500);
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session = replSessionSecurity.createClientSession(server, socket);
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boolean isSslEncryption =
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replSessionSecurity.isSslEncryption(server);
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/*
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* Send our ServerStartMessage.
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*/
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ServerStartMessage msg = new ServerStartMessage(serverID, baseDn,
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maxReceiveDelay, maxReceiveQueue, maxSendDelay, maxSendQueue,
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halfRcvWindow*2, heartbeatInterval, state,
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protocolVersion, isSslEncryption);
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session.publish(msg);
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/*
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* Read the ReplServerStartMessage that should come back.
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*/
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session.setSoTimeout(1000);
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startMsg = (ReplServerStartMessage) session.receive();
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receivedResponse = true;
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/*
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* We have sent our own protocol version to the replication server.
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* The replication server will use the same one (or an older one
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* if it is an old replication server).
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*/
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protocolVersion = ProtocolVersion.minWithCurrent(
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startMsg.getVersion());
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session.setSoTimeout(timeout);
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if (!isSslEncryption)
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{
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session.stopEncryption();
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}
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/*
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* We must not publish changes to a replicationServer 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 ReplicationServer has seen all our previous
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* changes.
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* If not, try another replicationServer.
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* If no other replicationServer has seen all our changes, recover
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* those changes and send them again to any replicationServer.
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*/
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ChangeNumber replServerMaxChangeNumber =
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startMsg.getServerState().getMaxChangeNumber(serverID);
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if (replServerMaxChangeNumber == null)
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replServerMaxChangeNumber = new ChangeNumber(0, 0, serverID);
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ChangeNumber ourMaxChangeNumber =
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state.getMaxChangeNumber(serverID);
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if ((ourMaxChangeNumber == null) ||
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(ourMaxChangeNumber.olderOrEqual(replServerMaxChangeNumber)))
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{
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replicationServer = ServerAddr.toString();
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maxSendWindow = startMsg.getWindowSize();
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connected = true;
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startHeartBeat();
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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 replicationServer 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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Message message = NOTE_CHANGELOG_MISSING_CHANGES.get(server);
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logError(message);
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}
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else
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{
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replayOperations.clear();
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// TODO: i18n
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logError(Message.raw("going to search for changes"));
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/*
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* Get all the changes that have not been seen by this
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* replicationServer and update it
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*/
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InternalClientConnection conn =
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InternalClientConnection.getRootConnection();
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LDAPFilter filter = LDAPFilter.decode(
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"("+ Historical.HISTORICALATTRIBUTENAME +
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">=dummy:" + replServerMaxChangeNumber + ")");
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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(baseDn.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 will start acepting again new updates but
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* some inconsistencies will stay between servers.
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* Log an error for the repair tool
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* that will need to resynchronize the servers.
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*/
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Message message = ERR_CANNOT_RECOVER_CHANGES.get(
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baseDn.toNormalizedString());
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logError(message);
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}
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else
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{
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replicationServer = ServerAddr.toString();
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maxSendWindow = startMsg.getWindowSize();
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connected = true;
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for (FakeOperation replayOp : replayOperations)
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{
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logError(Message.raw("sendingChange")); // TODO: i18n
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session.publish(replayOp.generateMessage());
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}
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startHeartBeat();
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logError(Message.raw("changes sent")); // TODO: i18n
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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 replicationServer in the list
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*/
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if (!connectionError )
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{
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// the error message is only logged once to avoid overflowing
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// the error log
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Message message = NOTE_NO_CHANGELOG_SERVER_LISTENING.get(server);
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logError(message);
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}
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}
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catch (Exception e)
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{
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Message message =
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ERR_EXCEPTION_STARTING_SESSION.get(e.getMessage());
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logError(message);
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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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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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// The session was already closed, just ignore.
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}
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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) && (checkState == true) && receivedResponse)
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{
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/*
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* We could not find a replicationServer 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 replicationServer.
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*/
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Message message = NOTE_COULD_NOT_FIND_CHANGELOG_WITH_MY_CHANGES.get();
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logError(message);
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checkState = false;
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}
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}
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if (connected)
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{
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// This server has connected correctly.
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// Log a message to let the administrator know that the failure was
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// resolved.
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// wakeup all the thread that were waiting on the window
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// on the previous connection.
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connectionError = false;
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if (sendWindow != null)
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sendWindow.release(Integer.MAX_VALUE);
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this.sendWindow = new Semaphore(maxSendWindow);
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connectPhaseLock.notify();
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Message message =
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NOTE_NOW_FOUND_CHANGELOG.get(replicationServer, baseDn.toString());
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logError(message);
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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 replicationServer
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* It's going to start in degraded mode.
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* Log a message
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*/
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if (!connectionError)
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{
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checkState = false;
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connectionError = true;
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connectPhaseLock.notify();
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Message message =
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NOTE_COULD_NOT_FIND_CHANGELOG.get(baseDn.toString());
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logError(message);
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}
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}
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}
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}
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/**
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* Start the heartbeat monitor thread.
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*/
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private void startHeartBeat()
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{
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// Start a heartbeat monitor thread.
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if (heartbeatInterval > 0)
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{
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heartbeatMonitor =
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new HeartbeatMonitor("Replication Heartbeat Monitor", session,
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heartbeatInterval);
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heartbeatMonitor.start();
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}
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}
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/**
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* restart the ReplicationBroker.
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*/
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private void reStart()
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{
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reStart(null);
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}
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/**
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* Restart the ReplicationServer 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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if (failingSession != null)
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{
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failingSession.close();
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numLostConnections++;
|
}
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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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MessageBuilder mb = new MessageBuilder();
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mb.append(ERR_EXCEPTION_STARTING_SESSION.get(e.getMessage()));
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mb.append(stackTraceToSingleLineString(e));
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logError(mb.toMessage());
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}
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if ((!connected) && (!shutdown))
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{
|
try
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{
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Thread.sleep(500);
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} catch (InterruptedException e)
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{
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// ignore
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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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* 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(ReplicationMessage msg)
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{
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boolean done = false;
|
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while (!done)
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{
|
if (connectionError)
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{
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// It was not possible to connect to any replication server.
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// Since the operation was already processed, we have no other
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// choice than to return without sending the ReplicationMessage
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// and relying on the resend procedure of the connect phase to
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// fix the problem when we finally connect.
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return;
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}
|
|
try
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{
|
boolean credit;
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ProtocolSession current_session;
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Semaphore currentWindowSemaphore;
|
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// save the session at the time when we acquire the
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// sendwindow credit so that we can make sure later
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// that the session did not change in between.
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// This is necessary to make sure that we don't publish a message
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// on a session with a credit that was acquired from a previous
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// session.
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synchronized (connectPhaseLock)
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{
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current_session = session;
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currentWindowSemaphore = sendWindow;
|
}
|
|
if (msg instanceof UpdateMessage)
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{
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// Acquiring the window credit must be done outside of the
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// connectPhaseLock because it can be blocking and we don't
|
// want to hold off reconnection in case the connection dropped.
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credit =
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currentWindowSemaphore.tryAcquire(
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(long) 500, TimeUnit.MILLISECONDS);
|
}
|
else
|
{
|
credit = true;
|
}
|
if (credit)
|
{
|
synchronized (connectPhaseLock)
|
{
|
// check the session. If it has changed, some
|
// deconnection/reconnection happened and we need to restart from
|
// scratch.
|
if (session == current_session)
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{
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session.publish(msg);
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done = true;
|
}
|
}
|
}
|
if (!credit)
|
{
|
// the window is still closed.
|
// Send a WindowProbe message to wakeup the receiver in case the
|
// window update message was lost somehow...
|
// then loop to check again if connection was closed.
|
session.publish(new WindowProbe());
|
}
|
} catch (IOException e)
|
{
|
// The receive threads should handle reconnection or
|
// mark this broker in error. Just retry.
|
synchronized (connectPhaseLock)
|
{
|
try
|
{
|
connectPhaseLock.wait(100);
|
} catch (InterruptedException e1)
|
{
|
// ignore
|
}
|
}
|
}
|
catch (InterruptedException e)
|
{
|
// just loop.
|
}
|
}
|
}
|
|
|
/**
|
* Receive a message.
|
* This method is not multithread safe and should either always be
|
* called in a single thread or protected by a locking mechanism
|
* before being called.
|
*
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* @return the received message
|
* @throws SocketTimeoutException if the timeout set by setSoTimeout
|
* has expired
|
*/
|
public ReplicationMessage receive() throws SocketTimeoutException
|
{
|
while (shutdown == false)
|
{
|
if (!connected)
|
{
|
reStart();
|
}
|
|
ProtocolSession failingSession = session;
|
try
|
{
|
ReplicationMessage msg = session.receive();
|
if (msg instanceof WindowMessage)
|
{
|
WindowMessage windowMsg = (WindowMessage) msg;
|
sendWindow.release(windowMsg.getNumAck());
|
}
|
else
|
{
|
if (msg instanceof UpdateMessage)
|
{
|
rcvWindow--;
|
if (rcvWindow < halfRcvWindow)
|
{
|
session.publish(new WindowMessage(halfRcvWindow));
|
rcvWindow += halfRcvWindow;
|
}
|
}
|
return msg;
|
}
|
} catch (SocketTimeoutException e)
|
{
|
throw e;
|
} catch (Exception e)
|
{
|
if (shutdown == false)
|
{
|
Message message =
|
NOTE_DISCONNECTED_FROM_CHANGELOG.get(replicationServer);
|
logError(message);
|
this.reStart(failingSession);
|
}
|
}
|
}
|
return null;
|
}
|
|
|
/**
|
* stop the server.
|
*/
|
public void stop()
|
{
|
replicationServer = "stopped";
|
shutdown = true;
|
connected = false;
|
try
|
{
|
if (debugEnabled())
|
{
|
TRACER.debugInfo("ReplicationBroker Stop Closing session");
|
}
|
|
if (session != null)
|
session.close();
|
} catch (IOException e)
|
{}
|
}
|
|
/**
|
* Set a timeout value.
|
* With this option set to a non-zero value, calls to the receive() method
|
* block for only this amount of time after which a
|
* java.net.SocketTimeoutException is raised.
|
* The Broker is valid and useable even after such an Exception is raised.
|
*
|
* @param timeout the specified timeout, in milliseconds.
|
* @throws SocketException if there is an error in the underlying protocol,
|
* such as a TCP error.
|
*/
|
public void setSoTimeout(int timeout) throws SocketException
|
{
|
this.timeout = timeout;
|
if (session != null)
|
{
|
session.setSoTimeout(timeout);
|
}
|
}
|
|
/**
|
* Get the name of the replicationServer to which this broker is currently
|
* connected.
|
*
|
* @return the name of the replicationServer to which this domain
|
* is currently connected.
|
*/
|
public String getReplicationServer()
|
{
|
return replicationServer;
|
}
|
/**
|
* {@inheritDoc}
|
*/
|
public void handleInternalSearchEntry(
|
InternalSearchOperation searchOperation,
|
SearchResultEntry searchEntry)
|
{
|
/*
|
* Only deal with modify operation so far
|
* TODO : implement code for ADD, DEL, MODDN operation
|
*
|
* Parse all ds-sync-hist attribute values
|
* - for each Changenumber > replication server MaxChangeNumber :
|
* build an attribute mod
|
*
|
*/
|
Iterable<FakeOperation> updates =
|
Historical.generateFakeOperations(searchEntry);
|
for (FakeOperation op : updates)
|
{
|
replayOperations.add(op);
|
}
|
}
|
|
/**
|
* {@inheritDoc}
|
*/
|
public void handleInternalSearchReference(
|
InternalSearchOperation searchOperation,
|
SearchResultReference searchReference)
|
{
|
// TODO to be implemented
|
}
|
|
/**
|
* Get the maximum receive window size.
|
*
|
* @return The maximum receive window size.
|
*/
|
public int getMaxRcvWindow()
|
{
|
return maxRcvWindow;
|
}
|
|
/**
|
* Get the current receive window size.
|
*
|
* @return The current receive window size.
|
*/
|
public int getCurrentRcvWindow()
|
{
|
return rcvWindow;
|
}
|
|
/**
|
* Get the maximum send window size.
|
*
|
* @return The maximum send window size.
|
*/
|
public int getMaxSendWindow()
|
{
|
return maxSendWindow;
|
}
|
|
/**
|
* Get the current send window size.
|
*
|
* @return The current send window size.
|
*/
|
public int getCurrentSendWindow()
|
{
|
if (connected)
|
return sendWindow.availablePermits();
|
else
|
return 0;
|
}
|
|
/**
|
* Get the number of times the connection was lost.
|
* @return The number of times the connection was lost.
|
*/
|
public int getNumLostConnections()
|
{
|
return numLostConnections;
|
}
|
|
|
/**
|
* Change some config parameters.
|
*
|
* @param replicationServers The new list of replication servers.
|
* @param maxReceiveQueue The max size of receive queue.
|
* @param maxReceiveDelay The max receive delay.
|
* @param maxSendQueue The max send queue.
|
* @param maxSendDelay The max Send Delay.
|
* @param window The max window size.
|
* @param heartbeatInterval The heartbeat interval.
|
*/
|
public void changeConfig(Collection<String> replicationServers,
|
int maxReceiveQueue, int maxReceiveDelay, int maxSendQueue,
|
int maxSendDelay, int window, long heartbeatInterval)
|
{
|
this.servers = replicationServers;
|
this.maxRcvWindow = window;
|
this.heartbeatInterval = heartbeatInterval;
|
this.maxReceiveDelay = maxReceiveDelay;
|
this.maxReceiveQueue = maxReceiveQueue;
|
this.maxSendDelay = maxSendDelay;
|
this.maxSendQueue = maxSendQueue;
|
// TODO : Changing those parameters requires to either restart a new
|
// session with the replicationServer or renegociate the parameters that
|
// were sent in the ServerStart message
|
}
|
|
/**
|
* Get the version of the replication protocol.
|
* @return The version of the replication protocol.
|
*/
|
public short getProtocolVersion()
|
{
|
return protocolVersion;
|
}
|
|
/**
|
* Check if the broker is connected to a ReplicationServer and therefore
|
* ready to received and send Replication Messages.
|
*
|
* @return true if the server is connected, false if not.
|
*/
|
public boolean isConnected()
|
{
|
return !connectionError;
|
}
|
|
/**
|
* Determine whether the connection to the replication server is encrypted.
|
* @return true if the connection is encrypted, false otherwise.
|
*/
|
public boolean isSessionEncrypted()
|
{
|
boolean isEncrypted = false;
|
if (session != null)
|
{
|
return session.isEncrypted();
|
}
|
return isEncrypted;
|
}
|
}
|
