/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at
* trunk/opends/resource/legal-notices/OpenDS.LICENSE
* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at
* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
* add the following below this CDDL HEADER, with the fields enclosed
* by brackets "[]" replaced with your own identifying information:
* Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*
*
* Copyright 2007-2009 Sun Microsystems, Inc.
* Portions Copyright 2011-2013 ForgeRock AS
*/
package org.opends.server.replication.service;
import static org.opends.messages.ReplicationMessages.*;
import static org.opends.server.loggers.ErrorLogger.logError;
import static org.opends.server.loggers.debug.DebugLogger.*;
import org.opends.server.loggers.debug.DebugTracer;
import org.opends.server.replication.protocol.Session;
import org.opends.server.types.DebugLogLevel;
import org.opends.server.api.DirectoryThread;
/**
* This class implements a thread to monitor heartbeat messages from the
* replication server. Each broker runs one of these threads.
*/
final class HeartbeatMonitor extends DirectoryThread
{
/**
* The tracer object for the debug logger.
*/
private static final DebugTracer TRACER = getTracer();
/**
* The session on which heartbeats are to be monitored.
*/
private final Session session;
/**
* The time in milliseconds between heartbeats from the replication
* server. Zero means heartbeats are off.
*/
private final long heartbeatInterval;
// Info required for logging.
private final int serverID;
private final int replicationServerID;
private final String baseDN;
/**
* Thread life-cycle state.
*/
private volatile boolean shutdown = false;
private final Object shutdownLock = new Object();
/**
* Create a heartbeat monitor thread.
*
* @param serverID
* The local directory server ID.
* @param replicationServerID
* The remote replication server ID.
* @param baseDN
* The name of the domain being replicated.
* @param session
* The session on which heartbeats are to be monitored.
* @param heartbeatInterval
* The expected interval between heartbeats received (in
* milliseconds).
*/
HeartbeatMonitor(int serverID, int replicationServerID,
String baseDN, Session session, long heartbeatInterval)
{
super("Replica DS("
+ serverID + ") heartbeat monitor for domain \""
+ baseDN + "\" from RS(" + replicationServerID
+ ") at " + session.getReadableRemoteAddress());
this.serverID = serverID;
this.replicationServerID = replicationServerID;
this.baseDN = baseDN;
this.session = session;
this.heartbeatInterval = heartbeatInterval;
}
/**
* Call this method to stop the thread.
*/
public void shutdown()
{
synchronized (shutdownLock)
{
shutdown = true;
shutdownLock.notifyAll();
}
}
/**
* {@inheritDoc}
*/
@Override
public void run()
{
if (debugEnabled())
{
TRACER.debugInfo(this + " is starting, expected interval is " +
heartbeatInterval);
}
try
{
boolean gotOneFailure = false;
while (!shutdown)
{
long now = System.currentTimeMillis();
long lastReceiveTime = session.getLastReceiveTime();
if (now > lastReceiveTime + heartbeatInterval)
{
if (gotOneFailure)
{
// Heartbeat is well overdue so the server is assumed to be dead.
logError(WARN_HEARTBEAT_FAILURE.get(serverID,
replicationServerID, session.getReadableRemoteAddress(),
baseDN));
// Exit monitor and close session.
shutdown = true;
break;
}
else
{
gotOneFailure = true;
}
}
else
{
gotOneFailure = false;
}
// Sleep.
synchronized (shutdownLock)
{
if (!shutdown)
{
try
{
shutdownLock.wait(heartbeatInterval);
}
catch (InterruptedException e)
{
// Server shutdown monitor may interrupt slow threads.
if (debugEnabled())
{
TRACER.debugCaught(DebugLogLevel.ERROR, e);
}
shutdown = true;
}
}
}
}
}
finally
{
if (debugEnabled())
{
TRACER.debugInfo("Heartbeat monitor is exiting");
}
session.close();
}
}
}