/*
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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 2006-2010 Sun Microsystems, Inc.
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* Portions copyright 2011-2013 ForgeRock AS
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*/
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package org.opends.server.replication.server;
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import java.io.IOException;
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import java.util.HashSet;
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import java.util.Set;
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import java.util.concurrent.CountDownLatch;
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import java.util.concurrent.TimeUnit;
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import org.opends.messages.Message;
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import org.opends.server.replication.common.CSN;
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import org.opends.server.replication.common.ServerState;
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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.util.TimeThread;
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import static org.opends.messages.ReplicationMessages.*;
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import static org.opends.server.loggers.ErrorLogger.*;
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import static org.opends.server.util.StaticUtils.*;
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/**
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* This class maintains monitor data for a replication domain.
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*/
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class ReplicationDomainMonitor
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{
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/**
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* The monitor data consolidated over the topology.
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*/
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private volatile ReplicationDomainMonitorData monitorData =
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new ReplicationDomainMonitorData();
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/**
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* This lock guards against multiple concurrent monitor data recalculation.
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*/
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private final Object pendingMonitorLock = new Object();
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/** Guarded by pendingMonitorLock. */
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private long monitorDataLastBuildDate = 0;
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/**
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* The set of replication servers which are already known to be slow to send
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* monitor data.
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* <p>
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* Guarded by pendingMonitorLock.
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*/
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private final Set<Integer> monitorDataLateServers = new HashSet<Integer>();
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/** This lock serializes updates to the pending monitor data. */
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private final Object pendingMonitorDataLock = new Object();
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/**
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* Monitor data which is currently being calculated.
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* <p>
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* Guarded by pendingMonitorDataLock.
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*/
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private ReplicationDomainMonitorData pendingMonitorData;
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/**
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* A set containing the IDs of servers from which we are currently expecting
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* monitor responses. When a response is received from a server we remove the
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* ID from this table, and count down the latch if the ID was in the table.
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* <p>
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* Guarded by pendingMonitorDataLock.
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*/
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private final Set<Integer> pendingMonitorDataServerIDs =
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new HashSet<Integer>();
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/**
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* This latch is non-null and is used in order to count incoming responses as
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* they arrive. Since incoming response may arrive at any time, even when
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* there is no pending monitor request, access to the latch must be guarded.
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* <p>
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* Guarded by pendingMonitorDataLock.
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*/
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private CountDownLatch pendingMonitorDataLatch;
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/**
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* TODO: Remote monitor data cache lifetime is 500ms/should be configurable.
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*/
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private final long monitorDataLifeTime = 500;
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/**
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* The replication domain monitored by this class.
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*/
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private final ReplicationServerDomain domain;
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/**
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* Builds an object of this class.
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*
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* @param replicationDomain
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* The replication domain that will be monitored by this class
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*/
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public ReplicationDomainMonitor(ReplicationServerDomain replicationDomain)
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{
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this.domain = replicationDomain;
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}
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/**
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* Returns the latest monitor data available for this replication server
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* domain.
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*
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* @return The latest monitor data available for this replication server
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* domain, which is never {@code null}.
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*/
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public ReplicationDomainMonitorData getMonitorData()
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{
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return monitorData;
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}
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/**
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* Recomputes the monitor data for this replication server domain.
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*
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* @return The recomputed monitor data for this replication server domain.
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* @throws InterruptedException
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* If this thread is interrupted while waiting for a response.
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*/
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public ReplicationDomainMonitorData recomputeMonitorData()
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throws InterruptedException
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{
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// Only allow monitor recalculation at a time.
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synchronized (pendingMonitorLock)
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{
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if ((monitorDataLastBuildDate + monitorDataLifeTime) < TimeThread
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.getTime())
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{
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try
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{
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String baseDN = domain.getBaseDN().toNormalizedString();
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// Prevent out of band monitor responses from updating our pending
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// table until we are ready.
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synchronized (pendingMonitorDataLock)
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{
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// Clear the pending monitor data.
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pendingMonitorDataServerIDs.clear();
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pendingMonitorData = new ReplicationDomainMonitorData();
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initializePendingMonitorData();
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// Send the monitor requests to the connected replication servers.
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for (ServerHandler rs : domain.getConnectedRSs().values())
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{
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final int serverId = rs.getServerId();
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MonitorRequestMsg msg =
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new MonitorRequestMsg(domain.getLocalRSServerId(), serverId);
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try
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{
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rs.send(msg);
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// Only register this server ID to pending table if we were able
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// to send the message.
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pendingMonitorDataServerIDs.add(serverId);
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}
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catch (IOException e)
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{
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// Log a message and do a best effort from here.
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Message message = ERR_SENDING_REMOTE_MONITOR_DATA_REQUEST.get(
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baseDN, serverId, e.getMessage());
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logError(message);
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}
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}
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// Create the pending response latch based on the number of expected
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// monitor responses.
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pendingMonitorDataLatch =
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new CountDownLatch(pendingMonitorDataServerIDs.size());
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}
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// Wait for the responses to come back.
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pendingMonitorDataLatch.await(5, TimeUnit.SECONDS);
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// Log messages for replication servers that have gone or come back.
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synchronized (pendingMonitorDataLock)
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{
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// Log servers that have come back.
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for (int serverId : monitorDataLateServers)
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{
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// Ensure that we only log once per server: don't fill the
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// error log with repeated messages.
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if (!pendingMonitorDataServerIDs.contains(serverId))
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{
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logError(NOTE_MONITOR_DATA_RECEIVED.get(baseDN, serverId));
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}
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}
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// Log servers that have gone away.
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for (int serverId : pendingMonitorDataServerIDs)
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{
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// Ensure that we only log once per server: don't fill the
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// error log with repeated messages.
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if (!monitorDataLateServers.contains(serverId))
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{
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logError(WARN_MISSING_REMOTE_MONITOR_DATA.get(
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baseDN, serverId));
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}
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}
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// Remember which servers were late this time.
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monitorDataLateServers.clear();
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monitorDataLateServers.addAll(pendingMonitorDataServerIDs);
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}
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// Store the new computed data as the reference
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synchronized (pendingMonitorDataLock)
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{
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// Now we have the expected answers or an error occurred
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pendingMonitorData.completeComputing();
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monitorData = pendingMonitorData;
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monitorDataLastBuildDate = TimeThread.getTime();
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}
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}
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finally
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{
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synchronized (pendingMonitorDataLock)
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{
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// Clear pending state.
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pendingMonitorData = null;
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pendingMonitorDataLatch = null;
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pendingMonitorDataServerIDs.clear();
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}
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}
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}
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}
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return monitorData;
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}
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/**
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* Start collecting global monitoring information for the replication domain.
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*/
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private void initializePendingMonitorData()
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{
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// Let's process our directly connected DS
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// - in the ServerHandler for a given DS1, the stored state contains :
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// -- the max CSN produced by DS1
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// -- the last CSN consumed by DS1 from DS2..n
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// - in the ReplicationDomainDB/ReplicaDB, the built-in state contains:
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// -- the max CSN produced by each server
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// So for a given DS connected we can take the state and the max from
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// the DS/state.
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for (ServerHandler ds : domain.getConnectedDSs().values())
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{
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final int serverId = ds.getServerId();
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final ServerState dsState = ds.getServerState().duplicate();
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CSN maxCSN = dsState.getCSN(serverId);
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if (maxCSN == null)
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{
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// This directly connected LS has never produced any change
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maxCSN = new CSN(0, 0, serverId);
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}
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pendingMonitorData.setMaxCSN(maxCSN);
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pendingMonitorData.setLDAPServerState(serverId, dsState);
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pendingMonitorData.setFirstMissingDate(serverId,
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ds.getApproxFirstMissingDate());
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}
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// Then initialize the max CSN for the LS that produced something
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// - from our own local db state
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// - whatever they are directly or indirectly connected
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final ServerState dbServerState = domain.getLatestServerState();
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pendingMonitorData.setRSState(domain.getLocalRSServerId(), dbServerState);
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for (CSN storedCSN : dbServerState)
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{
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pendingMonitorData.setMaxCSN(storedCSN);
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}
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}
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/**
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* Processes a Monitor message receives from a remote Replication Server and
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* stores the data received.
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*
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* @param msg
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* The message to be processed.
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* @param serverId
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* server handler that is receiving the message.
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*/
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public void receiveMonitorDataResponse(MonitorMsg msg, int serverId)
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{
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synchronized (pendingMonitorDataLock)
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{
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if (pendingMonitorData == null)
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{
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// This is a response for an earlier request whose computing is
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// already complete.
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logError(INFO_IGNORING_REMOTE_MONITOR_DATA.get(
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domain.getBaseDN().toNormalizedString(), msg.getSenderID()));
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return;
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}
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try
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{
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// Here is the RS state : list <serverID, lastCSN>
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// For each LDAP Server, we keep the max CSN across the RSes
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ServerState replServerState = msg.getReplServerDbState();
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pendingMonitorData.setMaxCSNs(replServerState);
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// store the remote RS states.
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pendingMonitorData.setRSState(msg.getSenderID(), replServerState);
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// Store the remote LDAP servers states
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for (int dsServerId : toIterable(msg.ldapIterator()))
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{
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ServerState dsServerState = msg.getLDAPServerState(dsServerId);
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pendingMonitorData.setMaxCSNs(dsServerState);
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pendingMonitorData.setLDAPServerState(dsServerId, dsServerState);
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pendingMonitorData.setFirstMissingDate(dsServerId,
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msg.getLDAPApproxFirstMissingDate(dsServerId));
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}
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// Process the latency reported by the remote RSi on its connections
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// to the other RSes
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for (int rsServerId : toIterable(msg.rsIterator()))
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{
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long newFmd = msg.getRSApproxFirstMissingDate(rsServerId);
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if (rsServerId == domain.getLocalRSServerId())
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{
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// this is the latency of the remote RSi regarding the current RS
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// let's update the first missing date of my connected LS
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for (DataServerHandler ds : domain.getConnectedDSs().values())
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{
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int connectedServerId = ds.getServerId();
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pendingMonitorData.setFirstMissingDate(connectedServerId, newFmd);
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}
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}
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else
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{
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// this is the latency of the remote RSi regarding another RSj
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// let's update the latency of the LSes connected to RSj
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ReplicationServerHandler rsjHdr =
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domain.getConnectedRSs().get(rsServerId);
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if (rsjHdr != null)
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{
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for (int remoteServerId : rsjHdr.getConnectedDirectoryServerIds())
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{
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pendingMonitorData.setFirstMissingDate(remoteServerId, newFmd);
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}
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}
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}
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}
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}
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catch (RuntimeException e)
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{
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// FIXME: do we really expect these???
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logError(ERR_PROCESSING_REMOTE_MONITOR_DATA.get(e.getMessage() + " "
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+ stackTraceToSingleLineString(e)));
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}
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finally
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{
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// Decreases the number of expected responses and potentially
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// wakes up the waiting requester thread.
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if (pendingMonitorDataServerIDs.remove(serverId))
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{
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pendingMonitorDataLatch.countDown();
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}
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}
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}
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}
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}
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