/*
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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 Sun Microsystems, Inc.
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*/
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package org.opends.server.replication.protocol;
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import org.opends.server.api.DirectoryThread;
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import static org.opends.server.loggers.debug.DebugLogger.debugEnabled;
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import static org.opends.server.loggers.debug.DebugLogger.debugVerbose;
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import static org.opends.server.loggers.debug.DebugLogger.debugInfo;
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import java.io.IOException;
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/**
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* This thread publishes a heartbeat message on a given protocol session at
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* regular intervals when there are no other synchronization messages being
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* published.
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*/
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public class HeartbeatThread extends DirectoryThread
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{
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/**
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* For test purposes only to simulate loss of heartbeats.
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*/
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static private boolean heartbeatsDisabled = false;
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/**
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* The session on which heartbeats are to be sent.
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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.
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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 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 sent.
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* @param heartbeatInterval The desired interval between heartbeats in
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* milliseconds.
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*/
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public HeartbeatThread(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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* {@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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try
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{
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if (debugEnabled())
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{
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debugInfo("Heartbeat thread is starting, interval is %d",
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heartbeatInterval);
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}
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HeartbeatMessage heartbeatMessage = new HeartbeatMessage();
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while (!shutdown)
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{
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long now = System.currentTimeMillis();
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if (debugEnabled())
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{
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debugVerbose("Heartbeat thread awoke at %d, last message was sent " +
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"at %d", now, session.getLastPublishTime());
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}
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if (now > session.getLastPublishTime() + heartbeatInterval)
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{
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if (!heartbeatsDisabled)
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{
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if (debugEnabled())
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{
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debugVerbose("Heartbeat sent at %d", now);
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}
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session.publish(heartbeatMessage);
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}
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}
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try
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{
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long sleepTime = session.getLastPublishTime() +
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heartbeatInterval - now;
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if (sleepTime <= 0)
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{
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sleepTime = heartbeatInterval;
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}
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if (debugEnabled())
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{
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debugVerbose("Heartbeat thread sleeping for %d", sleepTime);
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}
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Thread.sleep(sleepTime);
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}
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catch (InterruptedException e)
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{
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// Keep looping.
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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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if (debugEnabled())
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{
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debugInfo("Heartbeat thread could not send a heartbeat.");
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}
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// This will be caught in another thread.
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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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debugInfo("Heartbeat thread is exiting.");
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}
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}
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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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* For testing purposes only to simulate loss of heartbeats.
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* @param heartbeatsDisabled Set true to prevent heartbeats from being sent.
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*/
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public static void setHeartbeatsDisabled(boolean heartbeatsDisabled)
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{
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HeartbeatThread.heartbeatsDisabled = heartbeatsDisabled;
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}
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}
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