/*
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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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* Copyright 2006-2008 Sun Microsystems, Inc.
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*/
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package org.opends.server.replication.server;
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import org.opends.messages.Message;
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import org.opends.messages.MessageBuilder;
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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.server.loggers.ErrorLogger.logError;
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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.util.ArrayList;
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import java.util.Collection;
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import java.util.LinkedHashSet;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.Semaphore;
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import java.util.concurrent.TimeUnit;
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import java.util.Iterator;
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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.AckMsg;
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import org.opends.server.replication.protocol.ErrorMsg;
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import org.opends.server.replication.protocol.RoutableMsg;
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import org.opends.server.replication.protocol.UpdateMsg;
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import org.opends.server.replication.protocol.TopologyMsg;
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import org.opends.server.replication.protocol.MonitorMsg;
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import org.opends.server.replication.protocol.MonitorRequestMsg;
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import org.opends.server.replication.protocol.ResetGenerationIdMsg;
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import org.opends.server.types.DN;
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import org.opends.server.types.DirectoryException;
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import org.opends.server.types.ResultCode;
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import org.opends.server.util.TimeThread;
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import com.sleepycat.je.DatabaseException;
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import java.util.concurrent.locks.ReentrantLock;
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import org.opends.server.replication.common.DSInfo;
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import org.opends.server.replication.common.RSInfo;
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import org.opends.server.replication.common.ServerStatus;
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import org.opends.server.replication.common.StatusMachineEvent;
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import org.opends.server.replication.protocol.ChangeStatusMsg;
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/**
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* This class define an in-memory cache that will be used to store
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* the messages that have been received from an LDAP server or
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* from another replication server and that should be forwarded to
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* other servers.
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*
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* The size of the cache is set by configuration.
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* If the cache becomes bigger than the configured size, the older messages
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* are removed and should they be needed again must be read from the backing
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* file
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*
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*
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* it runs a thread that is responsible for saving the messages
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* received to the disk and for trimming them
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* Decision to trim can be based on disk space or age of the message
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*/
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public class ReplicationServerDomain
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{
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private final Object flowControlLock = new Object();
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private final DN baseDn;
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// The Status analyzer that periodically verifis if the connected DSs are
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// late or not
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private StatusAnalyzer statusAnalyzer = null;
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/*
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* The following map contains one balanced tree for each replica ID
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* to which we are currently publishing
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* the first update in the balanced tree is the next change that we
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* must push to this particular server
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*
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* We add new TreeSet in the HashMap when a new server register
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* to this replication server.
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*
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*/
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private final Map<Short, ServerHandler> directoryServers =
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new ConcurrentHashMap<Short, ServerHandler>();
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/*
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* This map contains one ServerHandler for each replication servers
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* with which we are connected (so normally all the replication servers)
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* the first update in the balanced tree is the next change that we
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* must push to this particular server
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*
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* We add new TreeSet in the HashMap when a new replication server register
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* to this replication server.
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*/
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private final Map<Short, ServerHandler> replicationServers =
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new ConcurrentHashMap<Short, ServerHandler>();
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/*
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* This map contains the List of updates received from each
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* LDAP server
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*/
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private final Map<Short, DbHandler> sourceDbHandlers =
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new ConcurrentHashMap<Short, DbHandler>();
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private ReplicationServer replicationServer;
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/* GenerationId management */
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private long generationId = -1;
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private boolean generationIdSavedStatus = false;
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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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/* Monitor data management */
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// TODO: Remote monitor data cache lifetime is 500ms/should be configurable
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private long monitorDataLifeTime = 500;
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/* Search op on monitor data is processed by a worker thread.
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* Requests are sent to the other RS,and responses are received by the
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* listener threads.
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* The worker thread is awoke on this semaphore, or on timeout.
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*/
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Semaphore remoteMonitorResponsesSemaphore;
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/**
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* The monitor data consolidated over the topology.
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*/
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private MonitorData monitorData = new MonitorData();
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private MonitorData wrkMonitorData;
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/**
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* Creates a new ReplicationServerDomain associated to the DN baseDn.
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*
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* @param baseDn The baseDn associated to the ReplicationServerDomain.
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* @param replicationServer the ReplicationServer that created this
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* replicationServer cache.
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*/
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public ReplicationServerDomain(DN baseDn, ReplicationServer replicationServer)
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{
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this.baseDn = baseDn;
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this.replicationServer = replicationServer;
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}
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/**
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* Add an update that has been received to the list of
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* updates that must be forwarded to all other servers.
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*
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* @param update The update that has been received.
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* @param sourceHandler The ServerHandler for the server from which the
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* update was received
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* @throws IOException When an IO exception happens during the update
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* processing.
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*/
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public void put(UpdateMsg update, ServerHandler sourceHandler)
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throws IOException
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{
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/*
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* TODO : In case that the source server is a LDAP server this method
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* should check that change did get pushed to at least one
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* other replication server before pushing it to the LDAP servers
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*/
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short id = update.getChangeNumber().getServerId();
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sourceHandler.updateServerState(update);
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sourceHandler.incrementInCount();
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if (update.isAssured())
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{
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int count = this.NumServers();
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if (count > 1)
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{
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if (sourceHandler.isReplicationServer())
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ServerHandler.addWaitingAck(update, sourceHandler.getServerId(),
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this, count - 1);
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else
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sourceHandler.addWaitingAck(update, count - 1);
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} else
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{
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sourceHandler.sendAck(update.getChangeNumber());
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}
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}
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if (generationId < 0)
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{
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generationId = sourceHandler.getGenerationId();
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}
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// look for the dbHandler that is responsible for the LDAP server which
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// generated the change.
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DbHandler dbHandler = null;
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synchronized (sourceDbHandlers)
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{
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dbHandler = sourceDbHandlers.get(id);
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if (dbHandler == null)
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{
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try
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{
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dbHandler = replicationServer.newDbHandler(id, baseDn);
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generationIdSavedStatus = true;
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} catch (DatabaseException e)
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{
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/*
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* Because of database problem we can't save any more changes
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* from at least one LDAP server.
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* This replicationServer therefore can't do it's job properly anymore
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* and needs to close all its connections and shutdown itself.
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*/
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MessageBuilder mb = new MessageBuilder();
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mb.append(ERR_CHANGELOG_SHUTDOWN_DATABASE_ERROR.get());
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mb.append(stackTraceToSingleLineString(e));
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logError(mb.toMessage());
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replicationServer.shutdown();
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return;
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}
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sourceDbHandlers.put(id, dbHandler);
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}
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}
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// Publish the messages to the source handler
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dbHandler.add(update);
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/*
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* Push the message to the replication servers
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*/
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if (!sourceHandler.isReplicationServer())
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{
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for (ServerHandler handler : replicationServers.values())
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{
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/**
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* Ignore updates to RS with bad gen id
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* (no system managed status for a RS)
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*/
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if ( (generationId>0) && (generationId != handler.getGenerationId()) )
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{
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if (debugEnabled())
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TRACER.debugInfo("In RS " +
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replicationServer.getServerId() +
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" for dn " + baseDn.toNormalizedString() + ", update " +
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update.getChangeNumber().toString() +
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" will not be sent to replication server " +
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Short.toString(handler.getServerId()) + " with generation id " +
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Long.toString(handler.getGenerationId()) +
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" different from local " +
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"generation id " + Long.toString(generationId));
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continue;
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}
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handler.add(update, sourceHandler);
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}
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}
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/*
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* Push the message to the LDAP servers
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*/
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for (ServerHandler handler : directoryServers.values())
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{
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// don't forward the change to the server that just sent it
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if (handler == sourceHandler)
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{
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continue;
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}
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/**
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* Ignore updates to DS in bad BAD_GENID_STATUS or FULL_UPDATE_STATUS
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*
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* The RSD lock should not be taken here as it is acceptable to have a
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* delay between the time the server has a wrong status and the fact we
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* detect it: the updates that succeed to pass during this time will have
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* no impact on remote server. But it is interesting to not saturate
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* uselessly the network if the updates are not necessary so this check to
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* stop sending updates is interesting anyway. Not taking the RSD lock
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* allows to have better performances in normal mode (most of the time).
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*/
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ServerStatus dsStatus = handler.getStatus();
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if ( (dsStatus == ServerStatus.BAD_GEN_ID_STATUS) ||
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(dsStatus == ServerStatus.FULL_UPDATE_STATUS) )
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{
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if (debugEnabled())
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{
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if (dsStatus == ServerStatus.BAD_GEN_ID_STATUS)
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TRACER.debugInfo("In RS " +
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replicationServer.getServerId() +
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" for dn " + baseDn.toNormalizedString() + ", update " +
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update.getChangeNumber().toString() +
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" will not be sent to directory server " +
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Short.toString(handler.getServerId()) + " with generation id " +
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Long.toString(handler.getGenerationId()) +
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" different from local " +
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"generation id " + Long.toString(generationId));
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if (dsStatus == ServerStatus.FULL_UPDATE_STATUS)
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TRACER.debugInfo("In RS " +
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replicationServer.getServerId() +
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" for dn " + baseDn.toNormalizedString() + ", update " +
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update.getChangeNumber().toString() +
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" will not be sent to directory server " +
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Short.toString(handler.getServerId()) +
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" as it is in full update");
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}
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continue;
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}
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handler.add(update, sourceHandler);
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}
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}
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/**
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* Wait a short while for ServerId disconnection.
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*
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* @param serverId the serverId to be checked.
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*/
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public void waitDisconnection(short serverId)
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{
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if (directoryServers.containsKey(serverId))
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{
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// try again
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try
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{
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Thread.sleep(100);
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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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* Stop operations with a list of servers.
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*
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* @param replServers the replication servers for which
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* we want to stop operations
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*/
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public void stopServers(Collection<String> replServers)
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{
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for (ServerHandler handler : replicationServers.values())
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{
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if (replServers.contains(handler.getServerAddressURL()))
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stopServer(handler);
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}
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}
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/**
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* Checks that a DS is not connected with same id.
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*
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* @param handler the DS we want to check
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* @return true if this is not a duplicate server
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*/
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public boolean checkForDuplicateDS(ServerHandler handler)
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{
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ServerHandler oldHandler = directoryServers.get(handler.getServerId());
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if (directoryServers.containsKey(handler.getServerId()))
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{
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// looks like two LDAP servers have the same serverId
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// log an error message and drop this connection.
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Message message = ERR_DUPLICATE_SERVER_ID.get(
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replicationServer.getMonitorInstanceName(), oldHandler.toString(),
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handler.toString(), handler.getServerId());
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logError(message);
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return false;
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}
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return true;
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}
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/**
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* Stop operations with a given server.
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*
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* @param handler the server for which we want to stop operations
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*/
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public void stopServer(ServerHandler handler)
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{
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/*
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* We must prevent deadlock on replication server domain lock, when for
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* instance this code is called from dying ServerReader but also dying
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* ServerWriter at the same time, or from a thread that wants to shut down
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* the handler. So use a thread safe flag to know if the job must be done
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* or not (is already being processed or not).
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*/
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if (!handler.engageShutdown())
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// Only do this once (prevent other thread to enter here again)
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{
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if (debugEnabled())
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TRACER.debugInfo(
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"In RS " + this.replicationServer.getMonitorInstanceName() +
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" for " + baseDn + " " +
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" stopServer " + handler.getMonitorInstanceName());
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try
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{
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// Acquire lock on domain (see more details in comment of start()
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// method of ServerHandler)
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lock();
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} catch (InterruptedException ex)
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{
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// Try doing job anyway...
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}
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if (handler.isReplicationServer())
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{
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if (replicationServers.containsValue(handler))
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{
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replicationServers.remove(handler.getServerId());
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handler.shutdown();
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// Check if generation id has to be resetted
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mayResetGenerationId();
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// Warn our DSs that a RS or DS has quit (does not use this
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// handler as already removed from list)
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sendTopoInfoToDSs(null);
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}
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} else
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{
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if (directoryServers.containsValue(handler))
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{
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// If this is the last DS for the domain, shutdown the status analyzer
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if (directoryServers.size() == 1)
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{
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if (debugEnabled())
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TRACER.debugInfo("In " +
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replicationServer.getMonitorInstanceName() +
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" remote server " + handler.getMonitorInstanceName() +
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" is the last DS to be stopped: stopping status analyzer");
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stopStatusAnalyzer();
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}
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directoryServers.remove(handler.getServerId());
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handler.shutdown();
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// Check if generation id has to be resetted
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mayResetGenerationId();
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// Update the remote replication servers with our list
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// of connected LDAP servers
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sendTopoInfoToRSs();
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// Warn our DSs that a RS or DS has quit (does not use this
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// handler as already removed from list)
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sendTopoInfoToDSs(null);
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}
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}
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release();
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}
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}
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/**
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* Resets the generationId for this domain if there is no LDAP
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* server currently connected and if the generationId has never
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* been saved.
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*/
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protected void mayResetGenerationId()
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{
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if (debugEnabled())
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TRACER.debugInfo(
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"In RS " + this.replicationServer.getMonitorInstanceName() +
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" for " + baseDn + " " +
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" mayResetGenerationId generationIdSavedStatus=" +
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generationIdSavedStatus);
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// If there is no more any LDAP server connected to this domain in the
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// topology and the generationId has never been saved, then we can reset
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// it and the next LDAP server to connect will become the new reference.
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boolean lDAPServersConnectedInTheTopology = false;
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if (directoryServers.isEmpty())
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{
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for (ServerHandler rsh : replicationServers.values())
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{
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if (generationId != rsh.getGenerationId())
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{
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if (debugEnabled())
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TRACER.debugInfo(
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"In RS " + this.replicationServer.getMonitorInstanceName() +
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" for " + baseDn + " " +
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" mayResetGenerationId skip RS" + rsh.getMonitorInstanceName() +
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" that has different genId");
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} else
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{
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if (rsh.hasRemoteLDAPServers())
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{
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lDAPServersConnectedInTheTopology = true;
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if (debugEnabled())
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TRACER.debugInfo(
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"In RS " + this.replicationServer.getMonitorInstanceName() +
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" for " + baseDn + " " +
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" mayResetGenerationId RS" + rsh.getMonitorInstanceName() +
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" has servers connected to it - will not reset generationId");
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break;
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}
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}
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}
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} else
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{
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lDAPServersConnectedInTheTopology = true;
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if (debugEnabled())
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TRACER.debugInfo(
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"In RS " + this.replicationServer.getMonitorInstanceName() +
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" for " + baseDn + " " +
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" has servers connected to it - will not reset generationId");
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}
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if ((!lDAPServersConnectedInTheTopology) &&
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(!this.generationIdSavedStatus) &&
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(generationId != -1))
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{
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setGenerationId(-1, false);
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}
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}
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/**
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* Checks that a RS is not already connected.
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*
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* @param handler the RS we want to check
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* @return true if this is not a duplicate server
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*/
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public boolean checkForDuplicateRS(ServerHandler handler)
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{
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ServerHandler oldHandler = replicationServers.get(handler.getServerId());
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if ((oldHandler != null))
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{
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if (oldHandler.getServerAddressURL().equals(
|
handler.getServerAddressURL()))
|
{
|
// this is the same server, this means that our ServerStart messages
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// have been sent at about the same time and 2 connections
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// have been established.
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// Silently drop this connection.
|
} else
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{
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// looks like two replication servers have the same serverId
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// log an error message and drop this connection.
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Message message = ERR_DUPLICATE_REPLICATION_SERVER_ID.get(
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replicationServer.getMonitorInstanceName(), oldHandler.
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getServerAddressURL(), handler.getServerAddressURL(),
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handler.getServerId());
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logError(message);
|
}
|
return false;
|
}
|
return true;
|
}
|
|
/**
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* Get the next update that need to be sent to a given LDAP server.
|
* This call is blocking when no update is available or when dependencies
|
* do not allow to send the next available change
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*
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* @param handler The server handler for the target directory server.
|
*
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* @return the update that must be forwarded
|
*/
|
public UpdateMsg take(ServerHandler handler)
|
{
|
UpdateMsg msg;
|
/*
|
* Get the balanced tree that we use to sort the changes to be
|
* sent to the replica from the cookie
|
*
|
* The next change to send is always the first one in the tree
|
* So this methods simply need to check that dependencies are OK
|
* and update this replicaId RUV
|
*
|
* TODO : dependency :
|
* before forwarding change, we should check that the dependency
|
* that is indicated in this change is OK (change already in the RUV)
|
*/
|
msg = handler.take();
|
synchronized (flowControlLock)
|
{
|
if (handler.restartAfterSaturation(null))
|
flowControlLock.notifyAll();
|
}
|
return msg;
|
}
|
|
/**
|
* Return a Set of String containing the lists of Replication servers
|
* connected to this server.
|
* @return the set of connected servers
|
*/
|
public Set<String> getChangelogs()
|
{
|
LinkedHashSet<String> mySet = new LinkedHashSet<String>();
|
|
for (ServerHandler handler : replicationServers.values())
|
{
|
mySet.add(handler.getServerAddressURL());
|
}
|
|
return mySet;
|
}
|
|
/**
|
* Return a Set containing the servers known by this replicationServer.
|
* @return a set containing the servers known by this replicationServer.
|
*/
|
public Set<Short> getServers()
|
{
|
return sourceDbHandlers.keySet();
|
}
|
|
/**
|
* Returns as a set of String the list of LDAP servers connected to us.
|
* Each string is the serverID of a connected LDAP server.
|
*
|
* @return The set of connected LDAP servers
|
*/
|
public List<String> getConnectedLDAPservers()
|
{
|
List<String> mySet = new ArrayList<String>(0);
|
|
for (ServerHandler handler : directoryServers.values())
|
{
|
mySet.add(String.valueOf(handler.getServerId()));
|
}
|
return mySet;
|
}
|
|
/**
|
* Creates and returns an iterator.
|
* When the iterator is not used anymore, the caller MUST call the
|
* ReplicationIterator.releaseCursor() method to free the resources
|
* and locks used by the ReplicationIterator.
|
*
|
* @param serverId Identifier of the server for which the iterator is created.
|
* @param changeNumber Starting point for the iterator.
|
* @return the created ReplicationIterator. Null when no DB is available
|
* for the provided server Id.
|
*/
|
public ReplicationIterator getChangelogIterator(short serverId,
|
ChangeNumber changeNumber)
|
{
|
DbHandler handler = sourceDbHandlers.get(serverId);
|
if (handler == null)
|
return null;
|
|
try
|
{
|
return handler.generateIterator(changeNumber);
|
} catch (Exception e)
|
{
|
return null;
|
}
|
}
|
|
/**
|
* Returns the change count for that ReplicationServerDomain.
|
*
|
* @return the change count.
|
*/
|
public long getChangesCount()
|
{
|
long entryCount = 0;
|
for (DbHandler dbHandler : sourceDbHandlers.values())
|
{
|
entryCount += dbHandler.getChangesCount();
|
}
|
return entryCount;
|
}
|
|
/**
|
* Get the baseDn.
|
* @return Returns the baseDn.
|
*/
|
public DN getBaseDn()
|
{
|
return baseDn;
|
}
|
|
/**
|
* Sets the provided DbHandler associated to the provided serverId.
|
*
|
* @param serverId the serverId for the server to which is
|
* associated the DbHandler.
|
* @param dbHandler the dbHandler associated to the serverId.
|
*
|
* @throws DatabaseException If a database error happened.
|
*/
|
public void setDbHandler(short serverId, DbHandler dbHandler)
|
throws DatabaseException
|
{
|
synchronized (sourceDbHandlers)
|
{
|
sourceDbHandlers.put(serverId, dbHandler);
|
}
|
}
|
|
/**
|
* Get the number of currently connected servers.
|
*
|
* @return the number of currently connected servers.
|
*/
|
private int NumServers()
|
{
|
return replicationServers.size() + directoryServers.size();
|
}
|
|
/**
|
* Add an ack to the list of ack received for a given change.
|
*
|
* @param message The ack message received.
|
* @param fromServerId The identifier of the server that sent the ack.
|
*/
|
public void ack(AckMsg message, short fromServerId)
|
{
|
/*
|
* there are 2 possible cases here :
|
* - the message that was acked comes from a server to which
|
* we are directly connected.
|
* In this case, we can find the handler from the directoryServers map
|
* - the message that was acked comes from a server to which we are not
|
* connected.
|
* In this case we need to find the replication server that forwarded
|
* the change and send back the ack to this server.
|
*/
|
ServerHandler handler = directoryServers.get(
|
message.getChangeNumber().getServerId());
|
if (handler != null)
|
handler.ack(message, fromServerId);
|
else
|
{
|
ServerHandler.ackChangelog(message, fromServerId);
|
}
|
}
|
|
/**
|
* Retrieves the destination handlers for a routable message.
|
*
|
* @param msg The message to route.
|
* @param senderHandler The handler of the server that published this message.
|
* @return The list of destination handlers.
|
*/
|
protected List<ServerHandler> getDestinationServers(RoutableMsg msg,
|
ServerHandler senderHandler)
|
{
|
List<ServerHandler> servers =
|
new ArrayList<ServerHandler>();
|
|
if (msg.getDestination() == RoutableMsg.THE_CLOSEST_SERVER)
|
{
|
// TODO Import from the "closest server" to be implemented
|
} else if (msg.getDestination() == RoutableMsg.ALL_SERVERS)
|
{
|
if (!senderHandler.isReplicationServer())
|
{
|
// Send to all replication servers with a least one remote
|
// server connected
|
for (ServerHandler rsh : replicationServers.values())
|
{
|
if (rsh.hasRemoteLDAPServers())
|
{
|
servers.add(rsh);
|
}
|
}
|
}
|
|
// Sends to all connected LDAP servers
|
for (ServerHandler destinationHandler : directoryServers.values())
|
{
|
// Don't loop on the sender
|
if (destinationHandler == senderHandler)
|
continue;
|
servers.add(destinationHandler);
|
}
|
} else
|
{
|
// Destination is one server
|
ServerHandler destinationHandler =
|
directoryServers.get(msg.getDestination());
|
if (destinationHandler != null)
|
{
|
servers.add(destinationHandler);
|
} else
|
{
|
// the targeted server is NOT connected
|
// Let's search for THE changelog server that MAY
|
// have the targeted server connected.
|
if (senderHandler.isLDAPserver())
|
{
|
for (ServerHandler h : replicationServers.values())
|
{
|
// Send to all replication servers with a least one remote
|
// server connected
|
if (h.isRemoteLDAPServer(msg.getDestination()))
|
{
|
servers.add(h);
|
}
|
}
|
}
|
}
|
}
|
return servers;
|
}
|
|
/**
|
* Processes a message coming from one server in the topology
|
* and potentially forwards it to one or all other servers.
|
*
|
* @param msg The message received and to be processed.
|
* @param senderHandler The server handler of the server that emitted
|
* the message.
|
*/
|
public void process(RoutableMsg msg, ServerHandler senderHandler)
|
{
|
|
// Test the message for which a ReplicationServer is expected
|
// to be the destination
|
if (msg.getDestination() == this.replicationServer.getServerId())
|
{
|
if (msg instanceof ErrorMsg)
|
{
|
ErrorMsg errorMsg = (ErrorMsg) msg;
|
logError(ERR_ERROR_MSG_RECEIVED.get(
|
errorMsg.getDetails()));
|
} else if (msg instanceof MonitorRequestMsg)
|
{
|
MonitorRequestMsg replServerMonitorRequestMsg =
|
(MonitorRequestMsg) msg;
|
|
MonitorMsg monitorMsg =
|
new MonitorMsg(
|
replServerMonitorRequestMsg.getDestination(),
|
replServerMonitorRequestMsg.getsenderID());
|
|
// Populate for each connected LDAP Server
|
// from the states stored in the serverHandler.
|
// - the server state
|
// - the older missing change
|
for (ServerHandler lsh : this.directoryServers.values())
|
{
|
monitorMsg.setServerState(
|
lsh.getServerId(),
|
lsh.getServerState(),
|
lsh.getApproxFirstMissingDate(),
|
true);
|
}
|
|
// Same for the connected RS
|
for (ServerHandler rsh : this.replicationServers.values())
|
{
|
monitorMsg.setServerState(
|
rsh.getServerId(),
|
rsh.getServerState(),
|
rsh.getApproxFirstMissingDate(),
|
false);
|
}
|
|
// Populate the RS state in the msg from the DbState
|
monitorMsg.setReplServerDbState(this.getDbServerState());
|
|
|
try
|
{
|
senderHandler.send(monitorMsg);
|
} catch (Exception e)
|
{
|
// We log the error. The requestor will detect a timeout or
|
// any other failure on the connection.
|
logError(ERR_CHANGELOG_ERROR_SENDING_MSG.get(
|
Short.toString((msg.getDestination()))));
|
}
|
} else if (msg instanceof MonitorMsg)
|
{
|
MonitorMsg monitorMsg =
|
(MonitorMsg) msg;
|
|
receivesMonitorDataResponse(monitorMsg);
|
} else
|
{
|
logError(NOTE_ERR_ROUTING_TO_SERVER.get(
|
msg.getClass().getCanonicalName()));
|
}
|
return;
|
}
|
|
List<ServerHandler> servers = getDestinationServers(msg, senderHandler);
|
|
if (servers.isEmpty())
|
{
|
MessageBuilder mb = new MessageBuilder();
|
mb.append(ERR_NO_REACHABLE_PEER_IN_THE_DOMAIN.get());
|
mb.append(" In Replication Server=" +
|
this.replicationServer.getMonitorInstanceName());
|
mb.append(" domain =" + this.baseDn);
|
mb.append(" unroutable message =" + msg.toString());
|
mb.append(" routing table is empty");
|
ErrorMsg errMsg = new ErrorMsg(
|
this.replicationServer.getServerId(),
|
msg.getsenderID(),
|
mb.toMessage());
|
logError(mb.toMessage());
|
try
|
{
|
senderHandler.send(errMsg);
|
} catch (IOException ioe)
|
{
|
// TODO Handle error properly (sender timeout in addition)
|
/*
|
* An error happened trying to send an error msg to this server.
|
* Log an error and close the connection to this server.
|
*/
|
MessageBuilder mb2 = new MessageBuilder();
|
mb2.append(ERR_CHANGELOG_ERROR_SENDING_ERROR.get(this.toString()));
|
mb2.append(stackTraceToSingleLineString(ioe));
|
logError(mb2.toMessage());
|
stopServer(senderHandler);
|
}
|
} else
|
{
|
for (ServerHandler targetHandler : servers)
|
{
|
try
|
{
|
targetHandler.send(msg);
|
} catch (IOException ioe)
|
{
|
/*
|
* An error happened trying the send a routabled message
|
* to its destination server.
|
* Send back an error to the originator of the message.
|
*/
|
MessageBuilder mb = new MessageBuilder();
|
mb.append(ERR_CHANGELOG_ERROR_SENDING_MSG.get(this.toString()));
|
mb.append(stackTraceToSingleLineString(ioe));
|
mb.append(" ");
|
mb.append(msg.getClass().getCanonicalName());
|
logError(mb.toMessage());
|
|
MessageBuilder mb1 = new MessageBuilder();
|
mb1.append(ERR_NO_REACHABLE_PEER_IN_THE_DOMAIN.get());
|
mb1.append("serverID:" + msg.getDestination());
|
ErrorMsg errMsg = new ErrorMsg(
|
msg.getsenderID(), mb1.toMessage());
|
try
|
{
|
senderHandler.send(errMsg);
|
} catch (IOException ioe1)
|
{
|
// an error happened on the sender session trying to recover
|
// from an error on the receiver session.
|
// We don't have much solution left beside closing the sessions.
|
stopServer(senderHandler);
|
stopServer(targetHandler);
|
}
|
// TODO Handle error properly (sender timeout in addition)
|
}
|
}
|
}
|
|
}
|
|
/**
|
* Send back an ack to the server that sent the change.
|
*
|
* @param changeNumber The ChangeNumber of the change that must be acked.
|
* @param isLDAPserver This boolean indicates if the server that sent the
|
* change was an LDAP server or a ReplicationServer.
|
*/
|
public void sendAck(ChangeNumber changeNumber, boolean isLDAPserver)
|
{
|
short serverId = changeNumber.getServerId();
|
sendAck(changeNumber, isLDAPserver, serverId);
|
}
|
|
/**
|
*
|
* Send back an ack to a server that sent the change.
|
*
|
* @param changeNumber The ChangeNumber of the change that must be acked.
|
* @param isLDAPserver This boolean indicates if the server that sent the
|
* change was an LDAP server or a ReplicationServer.
|
* @param serverId The identifier of the server from which we
|
* received the change..
|
*/
|
public void sendAck(ChangeNumber changeNumber, boolean isLDAPserver,
|
short serverId)
|
{
|
ServerHandler handler;
|
if (isLDAPserver)
|
handler = directoryServers.get(serverId);
|
else
|
handler = replicationServers.get(serverId);
|
|
// TODO : check for null handler and log error
|
try
|
{
|
handler.sendAck(changeNumber);
|
} catch (IOException e)
|
{
|
/*
|
* An error happened trying the send back an ack to this server.
|
* Log an error and close the connection to this server.
|
*/
|
MessageBuilder mb = new MessageBuilder();
|
mb.append(ERR_CHANGELOG_ERROR_SENDING_ACK.get(this.toString()));
|
mb.append(stackTraceToSingleLineString(e));
|
logError(mb.toMessage());
|
stopServer(handler);
|
}
|
}
|
|
/**
|
* Shutdown this ReplicationServerDomain.
|
*/
|
public void shutdown()
|
{
|
// Close session with other changelogs
|
for (ServerHandler serverHandler : replicationServers.values())
|
{
|
stopServer(serverHandler);
|
}
|
|
// Close session with other LDAP servers
|
for (ServerHandler serverHandler : directoryServers.values())
|
{
|
stopServer(serverHandler);
|
}
|
|
// Shutdown the dbHandlers
|
synchronized (sourceDbHandlers)
|
{
|
for (DbHandler dbHandler : sourceDbHandlers.values())
|
{
|
dbHandler.shutdown();
|
}
|
sourceDbHandlers.clear();
|
}
|
}
|
|
/**
|
* Returns the ServerState describing the last change from this replica.
|
*
|
* @return The ServerState describing the last change from this replica.
|
*/
|
public ServerState getDbServerState()
|
{
|
ServerState serverState = new ServerState();
|
for (DbHandler db : sourceDbHandlers.values())
|
{
|
serverState.update(db.getLastChange());
|
}
|
return serverState;
|
}
|
|
/**
|
* {@inheritDoc}
|
*/
|
@Override
|
public String toString()
|
{
|
return "ReplicationServerDomain " + baseDn;
|
}
|
|
/**
|
* Check if some server Handler should be removed from flow control state.
|
* @throws IOException If an error happened.
|
*/
|
public void checkAllSaturation() throws IOException
|
{
|
for (ServerHandler handler : replicationServers.values())
|
{
|
handler.checkWindow();
|
}
|
|
for (ServerHandler handler : directoryServers.values())
|
{
|
handler.checkWindow();
|
}
|
}
|
|
/**
|
* Check if a server that was in flow control can now restart
|
* sending updates.
|
* @param sourceHandler The server that must be checked.
|
* @return true if the server can restart sending changes.
|
* false if the server can't restart sending changes.
|
*/
|
public boolean restartAfterSaturation(ServerHandler sourceHandler)
|
{
|
for (ServerHandler handler : replicationServers.values())
|
{
|
if (!handler.restartAfterSaturation(sourceHandler))
|
return false;
|
}
|
|
for (ServerHandler handler : directoryServers.values())
|
{
|
if (!handler.restartAfterSaturation(sourceHandler))
|
return false;
|
}
|
return true;
|
}
|
|
/**
|
* Send a TopologyMsg to all the connected directory servers in order to
|
* let.
|
* them know the topology (every known DSs and RSs)
|
* @param notThisOne If not null, the topology message will not be sent to
|
* this passed server.
|
*/
|
public void sendTopoInfoToDSs(ServerHandler notThisOne)
|
{
|
for (ServerHandler handler : directoryServers.values())
|
{
|
if ((notThisOne == null) || // All DSs requested
|
((notThisOne != null) && (handler != notThisOne)))
|
// All except passed one
|
{
|
TopologyMsg topoMsg = createTopologyMsgForDS(handler.getServerId());
|
try
|
{
|
handler.sendTopoInfo(topoMsg);
|
} catch (IOException e)
|
{
|
Message message = ERR_EXCEPTION_SENDING_TOPO_INFO.get(
|
baseDn.toString(),
|
"directory", Short.toString(handler.getServerId()), e.getMessage());
|
logError(message);
|
}
|
}
|
}
|
}
|
|
/**
|
* Send a TopologyMsg to all the connected replication servers
|
* in order to let them know our connected LDAP servers.
|
*/
|
public void sendTopoInfoToRSs()
|
{
|
TopologyMsg topoMsg = createTopologyMsgForRS();
|
for (ServerHandler handler : replicationServers.values())
|
{
|
try
|
{
|
handler.sendTopoInfo(topoMsg);
|
} catch (IOException e)
|
{
|
Message message = ERR_EXCEPTION_SENDING_TOPO_INFO.get(
|
baseDn.toString(),
|
"replication", Short.toString(handler.getServerId()),
|
e.getMessage());
|
logError(message);
|
}
|
}
|
}
|
|
/**
|
* Creates a TopologyMsg filled with information to be sent to a remote RS.
|
* We send remote RS the info of every DS that are directly connected to us
|
* plus our own info as RS.
|
* @return A suitable TopologyMsg PDU to be sent to a peer RS
|
*/
|
public TopologyMsg createTopologyMsgForRS()
|
{
|
List<DSInfo> dsInfos = new ArrayList<DSInfo>();
|
|
// Go through every DSs
|
for (ServerHandler serverHandler : directoryServers.values())
|
{
|
dsInfos.add(serverHandler.toDSInfo());
|
}
|
|
// Create info for us (local RS)
|
List<RSInfo> rsInfos = new ArrayList<RSInfo>();
|
RSInfo localRSInfo = new RSInfo(replicationServer.getServerId(),
|
generationId, replicationServer.getGroupId());
|
rsInfos.add(localRSInfo);
|
|
return new TopologyMsg(dsInfos, rsInfos);
|
}
|
|
/**
|
* Creates a TopologyMsg filled with information to be sent to a DS.
|
* We send remote DS the info of every known DS and RS in the topology (our
|
* directly connected DSs plus the DSs connected to other RSs) except himself.
|
* Also put info related to local RS.
|
*
|
* @param destDsId The id of the DS the TopologyMsg PDU is to be sent to and
|
* that we must not include in the list DS list.
|
* @return A suitable TopologyMsg PDU to be sent to a peer DS
|
*/
|
public TopologyMsg createTopologyMsgForDS(short destDsId)
|
{
|
List<DSInfo> dsInfos = new ArrayList<DSInfo>();
|
List<RSInfo> rsInfos = new ArrayList<RSInfo>();
|
|
// Go through every DSs (except recipient of msg)
|
for (ServerHandler serverHandler : directoryServers.values())
|
{
|
if (serverHandler.getServerId() == destDsId)
|
continue;
|
dsInfos.add(serverHandler.toDSInfo());
|
}
|
|
// Add our own info (local RS)
|
RSInfo localRSInfo = new RSInfo(replicationServer.getServerId(),
|
generationId, replicationServer.getGroupId());
|
rsInfos.add(localRSInfo);
|
|
// Go through every peer RSs (and get their connected DSs), also add info
|
// for RSs
|
for (ServerHandler serverHandler : replicationServers.values())
|
{
|
// Put RS info
|
rsInfos.add(serverHandler.toRSInfo());
|
// Put his DSs info
|
Map<Short, LightweightServerHandler> lsList =
|
serverHandler.getConnectedDSs();
|
for (LightweightServerHandler ls : lsList.values())
|
{
|
dsInfos.add(ls.toDSInfo());
|
}
|
}
|
|
return new TopologyMsg(dsInfos, rsInfos);
|
}
|
|
/**
|
* Get the generationId associated to this domain.
|
*
|
* @return The generationId
|
*/
|
public long getGenerationId()
|
{
|
return generationId;
|
}
|
|
/**
|
* Get the generationId saved status.
|
*
|
* @return The generationId saved status.
|
*/
|
public boolean getGenerationIdSavedStatus()
|
{
|
return generationIdSavedStatus;
|
}
|
|
/**
|
* Sets the provided value as the new in memory generationId.
|
*
|
* @param generationId The new value of generationId.
|
* @param savedStatus The saved status of the generationId.
|
* @return The old generation id
|
*/
|
synchronized public long setGenerationId(long generationId,
|
boolean savedStatus)
|
{
|
if (debugEnabled())
|
TRACER.debugInfo(
|
"In " + this.replicationServer.getMonitorInstanceName() +
|
" baseDN=" + baseDn +
|
" RCache.set GenerationId=" + generationId);
|
|
long oldGenerationId = this.generationId;
|
|
if (this.generationId != generationId)
|
{
|
// we are changing of genId
|
clearDbs();
|
|
this.generationId = generationId;
|
this.generationIdSavedStatus = savedStatus;
|
}
|
|
return oldGenerationId;
|
}
|
|
/**
|
* Resets the generationID.
|
*
|
* @param senderHandler The handler associated to the server
|
* that requested to reset the generationId.
|
* @param genIdMsg The reset generation ID msg received.
|
*/
|
public void resetGenerationId(ServerHandler senderHandler,
|
ResetGenerationIdMsg genIdMsg)
|
{
|
if (debugEnabled())
|
{
|
TRACER.debugInfo(
|
"In RS " + getReplicationServer().getServerId() +
|
" Receiving ResetGenerationIdMsg from " + senderHandler.getServerId() +
|
" for baseDn " + baseDn + ":\n" + genIdMsg);
|
}
|
|
try
|
{
|
// Acquire lock on domain (see more details in comment of start() method
|
// of ServerHandler)
|
lock();
|
} catch (InterruptedException ex)
|
{
|
// Try doing job anyway...
|
}
|
|
long newGenId = genIdMsg.getGenerationId();
|
|
if (newGenId != this.generationId)
|
{
|
setGenerationId(newGenId, false);
|
}
|
else
|
{
|
// Order to take a gen id we already have, just ignore
|
if (debugEnabled())
|
{
|
TRACER.debugInfo(
|
"In RS " + getReplicationServer().getServerId()
|
+ " Reset generation id requested for baseDn " + baseDn
|
+ " but generation id was already " + this.generationId
|
+ ":\n" + genIdMsg);
|
}
|
}
|
|
// If we are the first replication server warned,
|
// then forwards the reset message to the remote replication servers
|
for (ServerHandler rsHandler : replicationServers.values())
|
{
|
try
|
{
|
// After we'll have sent the message , the remote RS will adopt
|
// the new genId
|
rsHandler.setGenerationId(newGenId);
|
if (senderHandler.isLDAPserver())
|
{
|
rsHandler.forwardGenerationIdToRS(genIdMsg);
|
}
|
} catch (IOException e)
|
{
|
logError(ERR_EXCEPTION_FORWARDING_RESET_GEN_ID.get(baseDn.toString(),
|
e.getMessage()));
|
}
|
}
|
|
// Change status of the connected DSs according to the requested new
|
// reference generation id
|
for (ServerHandler dsHandler : directoryServers.values())
|
{
|
try
|
{
|
dsHandler.changeStatusForResetGenId(newGenId);
|
} catch (IOException e)
|
{
|
logError(ERR_EXCEPTION_CHANGING_STATUS_AFTER_RESET_GEN_ID.get(baseDn.
|
toString(),
|
Short.toString(dsHandler.getServerId()),
|
e.getMessage()));
|
}
|
}
|
|
// Update every peers (RS/DS) with potential topology changes (status
|
// change). Rather than doing that each time a DS has a status change
|
// (consecutive to reset gen id message), we prefer advertising once for
|
// all after changes (less packet sent), here at the end of the reset msg
|
// treatment.
|
sendTopoInfoToDSs(null);
|
sendTopoInfoToRSs();
|
|
Message message = NOTE_RESET_GENERATION_ID.get(baseDn.toString(),
|
Long.toString(newGenId));
|
logError(message);
|
|
release();
|
}
|
|
/**
|
* Process message of a remote server changing his status.
|
* @param senderHandler The handler associated to the server
|
* that changed his status.
|
* @param csMsg The message containing the new status
|
*/
|
public void processNewStatus(ServerHandler senderHandler,
|
ChangeStatusMsg csMsg)
|
{
|
if (debugEnabled())
|
{
|
TRACER.debugInfo(
|
"In RS " + getReplicationServer().getServerId() +
|
" Receiving ChangeStatusMsg from " + senderHandler.getServerId() +
|
" for baseDn " + baseDn + ":\n" + csMsg);
|
}
|
|
try
|
{
|
// Acquire lock on domain (see more details in comment of start() method
|
// of ServerHandler)
|
lock();
|
} catch (InterruptedException ex)
|
{
|
// Try doing job anyway...
|
}
|
|
ServerStatus newStatus = senderHandler.processNewStatus(csMsg);
|
if (newStatus == ServerStatus.INVALID_STATUS)
|
{
|
// Already logged an error in processNewStatus()
|
// just return not to forward a bad status to topology
|
release();
|
return;
|
}
|
|
// Update every peers (RS/DS) with topology changes
|
sendTopoInfoToDSs(senderHandler);
|
sendTopoInfoToRSs();
|
|
Message message = NOTE_DIRECTORY_SERVER_CHANGED_STATUS.get(
|
Short.toString(senderHandler.getServerId()),
|
baseDn.toString(),
|
newStatus.toString());
|
logError(message);
|
|
release();
|
}
|
|
/**
|
* Change the status of a directory server according to the event generated
|
* from the status analyzer.
|
* @param serverHandler The handler of the directory server to update
|
* @param event The event to be used for new status computation
|
* @return True if we have been interrupted (must stop), false otherwise
|
*/
|
public boolean changeStatusFromStatusAnalyzer(ServerHandler serverHandler,
|
StatusMachineEvent event)
|
{
|
try
|
{
|
// Acquire lock on domain (see more details in comment of start() method
|
// of ServerHandler)
|
lock();
|
} catch (InterruptedException ex)
|
{
|
// We have been interrupted for dying, from stopStatusAnalyzer
|
// to prevent deadlock in this situation:
|
// RS is being shutdown, and stopServer will call stopStatusAnalyzer.
|
// Domain lock is taken by shutdown thread while status analyzer thread
|
// is willing to change the status of a server at the same time so is
|
// waiting for the domain lock at the same time. As shutdown thread is
|
// waiting for analyzer thread death, a deadlock occurs. So we force
|
// interruption of the status analyzer thread death after 2 seconds if
|
// it has not finished (see StatusAnalyzer.waitForShutdown). This allows
|
// to have the analyzer thread taking the domain lock only when the status
|
// of a DS has to be changed. See more comments in run method of
|
// StatusAnalyzer.
|
if (debugEnabled())
|
TRACER.debugInfo(
|
"Status analyzer for domain " + baseDn + " has been interrupted when"
|
+ " trying to acquire domain lock for changing the status of DS " +
|
serverHandler.getServerId());
|
return true;
|
}
|
|
ServerStatus newStatus = ServerStatus.INVALID_STATUS;
|
ServerStatus oldStatus = serverHandler.getStatus();
|
try
|
{
|
newStatus = serverHandler.changeStatusFromStatusAnalyzer(event);
|
} catch (IOException e)
|
{
|
logError(ERR_EXCEPTION_CHANGING_STATUS_FROM_STATUS_ANALYZER.get(baseDn.
|
toString(),
|
Short.toString(serverHandler.getServerId()),
|
e.getMessage()));
|
}
|
|
if ( (newStatus == ServerStatus.INVALID_STATUS) ||
|
(newStatus == oldStatus) )
|
{
|
// Change was impossible or already occurred (see StatusAnalyzer comments)
|
release();
|
return false;
|
}
|
|
// Update every peers (RS/DS) with topology changes
|
sendTopoInfoToDSs(serverHandler);
|
sendTopoInfoToRSs();
|
|
release();
|
return false;
|
}
|
|
/**
|
* Clears the Db associated with that cache.
|
*/
|
public void clearDbs()
|
{
|
// Reset the localchange and state db for the current domain
|
synchronized (sourceDbHandlers)
|
{
|
for (DbHandler dbHandler : sourceDbHandlers.values())
|
{
|
try
|
{
|
dbHandler.clear();
|
} catch (Exception e)
|
{
|
// TODO: i18n
|
MessageBuilder mb = new MessageBuilder();
|
mb.append(ERR_ERROR_CLEARING_DB.get(dbHandler.toString(),
|
e.getMessage() + " " +
|
stackTraceToSingleLineString(e)));
|
logError(mb.toMessage());
|
}
|
}
|
sourceDbHandlers.clear();
|
|
if (debugEnabled())
|
TRACER.debugInfo(
|
"In " + this.replicationServer.getMonitorInstanceName() +
|
" baseDN=" + baseDn +
|
" The source db handler has been cleared");
|
}
|
try
|
{
|
replicationServer.clearGenerationId(baseDn);
|
} catch (Exception e)
|
{
|
// TODO: i18n
|
logError(Message.raw(
|
"Exception caught while clearing generationId:" +
|
e.getLocalizedMessage()));
|
}
|
}
|
|
/**
|
* Returns whether the provided server is in degraded
|
* state due to the fact that the peer server has an invalid
|
* generationId for this domain.
|
*
|
* @param serverId The serverId for which we want to know the
|
* the state.
|
* @return Whether it is degraded or not.
|
*/
|
public boolean isDegradedDueToGenerationId(short serverId)
|
{
|
if (debugEnabled())
|
TRACER.debugInfo(
|
"In " + this.replicationServer.getMonitorInstanceName() +
|
" baseDN=" + baseDn +
|
" isDegraded serverId=" + serverId +
|
" given local generation Id=" + this.generationId);
|
|
ServerHandler handler = replicationServers.get(serverId);
|
if (handler == null)
|
{
|
handler = directoryServers.get(serverId);
|
if (handler == null)
|
{
|
return false;
|
}
|
}
|
|
if (debugEnabled())
|
TRACER.debugInfo(
|
"In " + this.replicationServer.getMonitorInstanceName() +
|
" baseDN=" + baseDn +
|
" Compute degradation of serverId=" + serverId +
|
" LS server generation Id=" + handler.getGenerationId());
|
return (handler.getGenerationId() != this.generationId);
|
}
|
|
/**
|
* Return the associated replication server.
|
* @return The replication server.
|
*/
|
public ReplicationServer getReplicationServer()
|
{
|
return replicationServer;
|
}
|
|
/**
|
* Process topology information received from a peer RS.
|
* @param topoMsg The just received topo message from remote RS
|
* @param handler The handler that received the message.
|
* @param allowResetGenId True for allowing to reset the generation id (
|
* when called after initial handshake)
|
* @throws IOException If an error occurred.
|
*/
|
public void receiveTopoInfoFromRS(TopologyMsg topoMsg, ServerHandler handler,
|
boolean allowResetGenId)
|
throws IOException
|
{
|
if (debugEnabled())
|
{
|
TRACER.debugInfo(
|
"In RS " + getReplicationServer().getServerId() +
|
" Receiving TopologyMsg from " + handler.getServerId() +
|
" for baseDn " + baseDn + ":\n" + topoMsg);
|
}
|
|
try
|
{
|
// Acquire lock on domain (see more details in comment of start() method
|
// of ServerHandler)
|
lock();
|
} catch (InterruptedException ex)
|
{
|
// Try doing job anyway...
|
}
|
|
/*
|
* Store DS connected to remote RS and update information about the peer RS
|
*/
|
handler.receiveTopoInfoFromRS(topoMsg);
|
|
/*
|
* Handle generation id
|
*/
|
if (allowResetGenId)
|
{
|
// Check if generation id has to be resetted
|
mayResetGenerationId();
|
if (generationId < 0)
|
generationId = handler.getGenerationId();
|
}
|
|
if (generationId > 0 && (generationId != handler.getGenerationId()))
|
{
|
Message message = NOTE_BAD_GENERATION_ID_FROM_RS.get(
|
baseDn.toNormalizedString(),
|
Short.toString(handler.getServerId()),
|
Long.toString(handler.getGenerationId()),
|
Long.toString(generationId));
|
logError(message);
|
|
ErrorMsg errorMsg = new ErrorMsg(
|
getReplicationServer().getServerId(),
|
handler.getServerId(),
|
message);
|
handler.sendError(errorMsg);
|
}
|
|
/*
|
* Sends the currently known topology information to every connected
|
* DS we have.
|
*/
|
sendTopoInfoToDSs(null);
|
|
release();
|
}
|
|
/* =======================
|
* Monitor Data generation
|
* =======================
|
*/
|
/**
|
* Retrieves the global monitor data.
|
* @return The monitor data.
|
* @throws DirectoryException When an error occurs.
|
*/
|
synchronized protected MonitorData getMonitorData()
|
throws DirectoryException
|
{
|
if (monitorData.getBuildDate() + monitorDataLifeTime > TimeThread.getTime())
|
{
|
if (debugEnabled())
|
TRACER.debugInfo(
|
"In " + this.replicationServer.getMonitorInstanceName() +
|
" baseDn=" + baseDn + " getRemoteMonitorData in cache");
|
// The current data are still valid. No need to renew them.
|
return monitorData;
|
}
|
|
wrkMonitorData = new MonitorData();
|
synchronized (wrkMonitorData)
|
{
|
if (debugEnabled())
|
TRACER.debugInfo(
|
"In " + this.replicationServer.getMonitorInstanceName() +
|
" baseDn=" + baseDn + " Computing monitor data ");
|
|
// Let's process our directly connected LSes
|
// - in the ServerHandler for a given LS1, the stored state contains :
|
// - the max CN produced by LS1
|
// - the last CN consumed by LS1 from LS2..n
|
// - in the RSdomain/dbHandler, the built-in state contains :
|
// - the max CN produced by each server
|
// So for a given LS connected we can take the state and the max from
|
// the LS/state.
|
|
for (ServerHandler directlsh : directoryServers.values())
|
{
|
short serverID = directlsh.getServerId();
|
|
// the state comes from the state stored in the SH
|
ServerState directlshState = directlsh.getServerState().duplicate();
|
|
// the max CN sent by that LS also comes from the SH
|
ChangeNumber maxcn = directlshState.getMaxChangeNumber(serverID);
|
if (maxcn == null)
|
{
|
// This directly connected LS has never produced any change
|
maxcn = new ChangeNumber(0, 0, serverID);
|
}
|
wrkMonitorData.setMaxCN(serverID, maxcn);
|
wrkMonitorData.setLDAPServerState(serverID, directlshState);
|
wrkMonitorData.setFirstMissingDate(serverID,
|
directlsh.getApproxFirstMissingDate());
|
}
|
|
// Then initialize the max CN for the LS that produced something
|
// - from our own local db state
|
// - whatever they are directly or undirectly connected
|
ServerState dbServerState = getDbServerState();
|
Iterator<Short> it = dbServerState.iterator();
|
while (it.hasNext())
|
{
|
short sid = it.next();
|
ChangeNumber storedCN = dbServerState.getMaxChangeNumber(sid);
|
wrkMonitorData.setMaxCN(sid, storedCN);
|
}
|
|
// Now we have used all available local informations
|
// and we need the remote ones.
|
if (debugEnabled())
|
TRACER.debugInfo(
|
"In " + this.replicationServer.getMonitorInstanceName() +
|
" baseDn=" + baseDn + " Local monitor data: " +
|
wrkMonitorData.toString());
|
}
|
|
// Send Request to the other Replication Servers
|
if (remoteMonitorResponsesSemaphore == null)
|
{
|
remoteMonitorResponsesSemaphore = new Semaphore(0);
|
short requestCnt = sendMonitorDataRequest();
|
// Wait reponses from them or timeout
|
waitMonitorDataResponses(requestCnt);
|
} else
|
{
|
// The processing of renewing the monitor cache is already running
|
// We'll make it sleeping until the end
|
// TODO: unit test for this case.
|
while (remoteMonitorResponsesSemaphore != null)
|
{
|
waitMonitorDataResponses(1);
|
}
|
}
|
|
wrkMonitorData.completeComputing();
|
|
// Store the new computed data as the reference
|
synchronized (monitorData)
|
{
|
// Now we have the expected answers or an error occurred
|
monitorData = wrkMonitorData;
|
wrkMonitorData = null;
|
if (debugEnabled())
|
TRACER.debugInfo(
|
"In " + this.replicationServer.getMonitorInstanceName() +
|
" baseDn=" + baseDn + " *** Computed MonitorData: " +
|
monitorData.toString());
|
}
|
return monitorData;
|
}
|
|
/**
|
* Sends a MonitorRequest message to all connected RS.
|
* @return the number of requests sent.
|
* @throws DirectoryException when a problem occurs.
|
*/
|
protected short sendMonitorDataRequest()
|
throws DirectoryException
|
{
|
short sent = 0;
|
try
|
{
|
for (ServerHandler rs : replicationServers.values())
|
{
|
MonitorRequestMsg msg =
|
new MonitorRequestMsg(this.replicationServer.getServerId(),
|
rs.getServerId());
|
rs.send(msg);
|
sent++;
|
}
|
} catch (Exception e)
|
{
|
Message message = ERR_SENDING_REMOTE_MONITOR_DATA_REQUEST.get();
|
logError(message);
|
throw new DirectoryException(ResultCode.OTHER,
|
message, e);
|
}
|
return sent;
|
}
|
|
/**
|
* Wait for the expected count of received MonitorMsg.
|
* @param expectedResponses The number of expected answers.
|
* @throws DirectoryException When an error occurs.
|
*/
|
protected void waitMonitorDataResponses(int expectedResponses)
|
throws DirectoryException
|
{
|
try
|
{
|
if (debugEnabled())
|
TRACER.debugInfo(
|
"In " + this.replicationServer.getMonitorInstanceName() +
|
" baseDn=" + baseDn +
|
" waiting for " + expectedResponses + " expected monitor messages");
|
|
boolean allPermitsAcquired =
|
remoteMonitorResponsesSemaphore.tryAcquire(
|
expectedResponses,
|
(long) 5000, TimeUnit.MILLISECONDS);
|
|
if (!allPermitsAcquired)
|
{
|
logError(ERR_MISSING_REMOTE_MONITOR_DATA.get());
|
// let's go on in best effort even with limited data received.
|
} else
|
{
|
if (debugEnabled())
|
TRACER.debugInfo(
|
"In " + this.replicationServer.getMonitorInstanceName() +
|
" baseDn=" + baseDn +
|
" Successfully received all " + expectedResponses +
|
" expected monitor messages");
|
}
|
} catch (Exception e)
|
{
|
logError(ERR_PROCESSING_REMOTE_MONITOR_DATA.get(e.getMessage()));
|
} finally
|
{
|
remoteMonitorResponsesSemaphore = null;
|
}
|
}
|
|
/**
|
* Processes a Monitor message receives from a remote Replication Server
|
* and stores the data received.
|
*
|
* @param msg The message to be processed.
|
*/
|
public void receivesMonitorDataResponse(MonitorMsg msg)
|
{
|
if (debugEnabled())
|
TRACER.debugInfo(
|
"In " + this.replicationServer.getMonitorInstanceName() +
|
"Receiving " + msg + " from " + msg.getsenderID() +
|
remoteMonitorResponsesSemaphore);
|
|
if (remoteMonitorResponsesSemaphore == null)
|
{
|
// Let's ignore the remote monitor data just received
|
// since the computing processing has been ended.
|
// An error - probably a timemout - occurred that was already logged
|
logError(NOTE_IGNORING_REMOTE_MONITOR_DATA.get(
|
Short.toString(msg.getsenderID())));
|
return;
|
}
|
|
try
|
{
|
synchronized (wrkMonitorData)
|
{
|
// Here is the RS state : list <serverID, lastChangeNumber>
|
// For each LDAP Server, we keep the max CN accross the RSes
|
ServerState replServerState = msg.getReplServerDbState();
|
wrkMonitorData.setMaxCNs(replServerState);
|
|
// Store the remote LDAP servers states
|
Iterator<Short> lsidIterator = msg.ldapIterator();
|
while (lsidIterator.hasNext())
|
{
|
short sid = lsidIterator.next();
|
wrkMonitorData.setLDAPServerState(sid,
|
msg.getLDAPServerState(sid).duplicate());
|
wrkMonitorData.setFirstMissingDate(sid,
|
msg.getLDAPApproxFirstMissingDate(sid));
|
}
|
|
// Process the latency reported by the remote RSi on its connections
|
// to the other RSes
|
Iterator<Short> rsidIterator = msg.rsIterator();
|
while (rsidIterator.hasNext())
|
{
|
short rsid = rsidIterator.next();
|
if (rsid == replicationServer.getServerId())
|
{
|
// this is the latency of the remote RSi regarding the current RS
|
// let's update the fmd of my connected LS
|
for (ServerHandler connectedlsh : directoryServers.values())
|
{
|
short connectedlsid = connectedlsh.getServerId();
|
Long newfmd = msg.getRSApproxFirstMissingDate(rsid);
|
wrkMonitorData.setFirstMissingDate(connectedlsid, newfmd);
|
}
|
} else
|
{
|
// this is the latency of the remote RSi regarding another RSj
|
// let's update the latency of the LSes connected to RSj
|
ServerHandler rsjHdr = replicationServers.get(rsid);
|
if (rsjHdr != null)
|
{
|
for (short remotelsid : rsjHdr.getConnectedDirectoryServerIds())
|
{
|
Long newfmd = msg.getRSApproxFirstMissingDate(rsid);
|
wrkMonitorData.setFirstMissingDate(remotelsid, newfmd);
|
}
|
}
|
}
|
}
|
if (debugEnabled())
|
{
|
if (debugEnabled())
|
TRACER.debugInfo(
|
"In " + this.replicationServer.getMonitorInstanceName() +
|
" baseDn=" + baseDn +
|
" Processed msg from " + msg.getsenderID() +
|
" New monitor data: " + wrkMonitorData.toString());
|
}
|
}
|
|
// Decreases the number of expected responses and potentially
|
// wakes up the waiting requestor thread.
|
remoteMonitorResponsesSemaphore.release();
|
|
} catch (Exception e)
|
{
|
logError(ERR_PROCESSING_REMOTE_MONITOR_DATA.get(e.getMessage() +
|
stackTraceToSingleLineString(e)));
|
|
// If an exception occurs while processing one of the expected message,
|
// the processing is aborted and the waiting thread is awoke.
|
remoteMonitorResponsesSemaphore.notifyAll();
|
}
|
}
|
|
/**
|
* Set the purge delay on all the db Handlers for this Domain
|
* of Replicaiton.
|
*
|
* @param delay The new purge delay to use.
|
*/
|
void setPurgeDelay(long delay)
|
{
|
for (DbHandler handler : sourceDbHandlers.values())
|
{
|
handler.setPurgeDelay(delay);
|
}
|
}
|
|
/**
|
* Get the map of connected DSs.
|
* @return The map of connected DSs
|
*/
|
public Map<Short, ServerHandler> getConnectedDSs()
|
{
|
return directoryServers;
|
}
|
|
/**
|
* Get the map of connected RSs.
|
* @return The map of connected RSs
|
*/
|
public Map<Short, ServerHandler> getConnectedRSs()
|
{
|
return replicationServers;
|
}
|
/**
|
* A synchronization mechanism is created to insure exclusive access to the
|
* domain. The goal is to have a consistent view of the topology by locking
|
* the structures holding the topology view of the domain: directoryServers
|
* and replicationServers. When a connection is established with a peer DS or
|
* RS, the lock should be taken before updating these structures, then
|
* released. The same mechanism should be used when updating any data related
|
* to the view of the topology: for instance if the status of a DS is changed,
|
* the lock should be taken before updating the matching server handler and
|
* sending the topology messages to peers and released after.... This allows
|
* every member of the topology to have a consistent view of the topology and
|
* to be sure it will not miss some information.
|
* So the locking system must be called (not exhaustive list):
|
* - when connection established with a DS or RS
|
* - when connection ended with a DS or RS
|
* - when receiving a TopologyMsg and updating structures
|
* - when creating and sending a TopologyMsg
|
* - when a DS status is changing (ChangeStatusMsg received or sent)...
|
*/
|
private ReentrantLock lock = new ReentrantLock();
|
|
/**
|
* Tests if the current thread has the lock on this domain.
|
* @return True if the current thread has the lock.
|
*/
|
public boolean hasLock()
|
{
|
return (lock.getHoldCount() > 0);
|
}
|
|
/**
|
* Takes the lock on this domain (blocking until lock can be acquired) or
|
* calling thread is interrupted.
|
* @throws java.lang.InterruptedException If interrupted.
|
*/
|
public void lock() throws InterruptedException
|
{
|
lock.lockInterruptibly();
|
}
|
|
/**
|
* Releases the lock on this domain.
|
*/
|
public void release()
|
{
|
lock.unlock();
|
}
|
|
/**
|
* Tries to acquire the lock on the domain within a given amount of time.
|
* @param timeout The amount of milliseconds to wait for acquiring the lock.
|
* @return True if the lock was acquired, false if timeout occurred.
|
* @throws java.lang.InterruptedException When call was interrupted.
|
*/
|
public boolean tryLock(long timeout) throws InterruptedException
|
{
|
return lock.tryLock(timeout, TimeUnit.MILLISECONDS);
|
}
|
|
/**
|
* Starts the status analyzer for the domain.
|
*/
|
public void startStatusAnalyzer()
|
{
|
if (statusAnalyzer == null)
|
{
|
int degradedStatusThreshold =
|
replicationServer.getDegradedStatusThreshold();
|
if (degradedStatusThreshold > 0) // 0 means no status analyzer
|
{
|
statusAnalyzer = new StatusAnalyzer(this, degradedStatusThreshold);
|
statusAnalyzer.start();
|
}
|
}
|
}
|
|
/**
|
* Stops the status analyzer for the domain.
|
*/
|
public void stopStatusAnalyzer()
|
{
|
if (statusAnalyzer != null)
|
{
|
statusAnalyzer.shutdown();
|
statusAnalyzer.waitForShutdown();
|
statusAnalyzer = null;
|
}
|
}
|
|
/**
|
* Tests if the status analyzer for this domain is running.
|
* @return True if the status analyzer is running, false otherwise.
|
*/
|
public boolean isRunningStatusAnalyzer()
|
{
|
return (statusAnalyzer != null);
|
}
|
|
/**
|
* Update the status analyzer with the new threshold value.
|
* @param degradedStatusThreshold The new threshold value.
|
*/
|
public void updateStatusAnalyzer(int degradedStatusThreshold)
|
{
|
if (statusAnalyzer != null)
|
{
|
statusAnalyzer.setDeradedStatusThreshold(degradedStatusThreshold);
|
}
|
}
|
}
|
