/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Portions Copyright 2007-2008 Sun Microsystems, Inc.
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*/
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package org.opends.server.replication.plugin;
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import static org.opends.messages.ReplicationMessages.*;
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import static org.opends.server.loggers.ErrorLogger.logError;
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import static org.opends.server.loggers.debug.DebugLogger.*;
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import static org.opends.server.util.StaticUtils.stackTraceToSingleLineString;
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import org.opends.server.loggers.debug.DebugTracer;
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import java.io.IOException;
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import org.opends.server.api.DirectoryThread;
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import org.opends.server.replication.protocol.ProtocolSession;
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/**
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* This class implements a thread to monitor heartbeat messages from the
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* replication server. Each broker runs one of these threads.
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*/
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public class HeartbeatMonitor extends DirectoryThread
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{
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/**
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* The tracer object for the debug logger.
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*/
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private static final DebugTracer TRACER = getTracer();
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/**
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* The session on which heartbeats are to be monitored.
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*/
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private ProtocolSession session;
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/**
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* The time in milliseconds between heartbeats from the replication
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* server. Zero means heartbeats are off.
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*/
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private long heartbeatInterval;
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/**
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* Set this to stop the thread.
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*/
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private boolean shutdown = false;
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/**
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* Create a heartbeat monitor thread.
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* @param threadName The name of the heartbeat thread.
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* @param session The session on which heartbeats are to be monitored.
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* @param heartbeatInterval The expected interval between heartbeats in
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* milliseconds.
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*/
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public HeartbeatMonitor(String threadName, ProtocolSession session,
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long heartbeatInterval)
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{
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super(threadName);
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this.session = session;
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this.heartbeatInterval = heartbeatInterval;
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}
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/**
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* Call this method to stop the thread.
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*/
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public void shutdown()
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{
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shutdown = true;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public void run()
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{
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boolean gotOneFailure = false;
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if (debugEnabled())
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{
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TRACER.debugInfo("Heartbeat monitor is starting, expected interval is " +
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heartbeatInterval +
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stackTraceToSingleLineString(new Exception()));
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}
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try
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{
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while (!shutdown)
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{
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long now = System.currentTimeMillis();
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long lastReceiveTime = session.getLastReceiveTime();
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if (now > lastReceiveTime + heartbeatInterval)
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{
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if (gotOneFailure == true)
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{
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// Heartbeat is well overdue so the server is assumed to be dead.
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logError(NOTE_HEARTBEAT_FAILURE.get(currentThread().getName()));
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session.close();
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break;
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}
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else
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{
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gotOneFailure = true;
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}
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}
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else
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{
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gotOneFailure = false;
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}
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try
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{
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Thread.sleep(heartbeatInterval);
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}
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catch (InterruptedException e)
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{
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// That's OK.
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}
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}
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}
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catch (IOException e)
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{
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// Hope that's OK.
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}
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finally
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{
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if (debugEnabled())
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{
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TRACER.debugInfo("Heartbeat monitor is exiting." +
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stackTraceToSingleLineString(new Exception()));
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}
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}
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}
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}
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