/*
* JBoss, Home of Professional Open Source
* Copyright 2005-2011, Red Hat Middleware LLC, and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.jms.server;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.management.ObjectName;
import org.jboss.logging.Logger;
import org.jboss.messaging.core.contract.PersistenceManager;
import org.jboss.messaging.core.impl.postoffice.MessagingPostOffice;
import org.jboss.messaging.util.JMXAccessor;
import org.jboss.system.ServiceMBeanSupport;
/**
* A MessagingClusterHealthMBean
*
* @author <a href="mailto:hgao@redhat.com">Howard Gao</a>
*
* Created Jan 31, 2011 8:52:02 PM
*
*
*/
public class MessagingClusterHealthMBean extends ServiceMBeanSupport
{
private static final Logger log = Logger.getLogger(MessagingClusterHealthMBean.class);
private String serverPeer;
private String postOffice;
private List<ObjectName> connectionFactories;
private List<ObjectName> destinations;
private String persistenceManager;
private boolean nodeStopped;
private NodeRecovery nodeRecovery;
private long shutdownDelay;
public void startService() throws Exception
{
connectionFactories = new ArrayList<ObjectName>();
destinations = new ArrayList<ObjectName>();
log.info(this + " started.");
}
public void stopService() throws Exception
{
setServerPeer(null);
setPostOffice(null);
setPersistenceManager(null);
connectionFactories.clear();
destinations.clear();
if (nodeRecovery != null)
{
nodeRecovery.abandon();
nodeRecovery = null;
}
log.info(this + " stopped.");
}
public Object getInstance()
{
return this;
}
public synchronized void stopNodeOnDBFailure() throws Exception
{
if (nodeStopped) return;
log.info("Stopping JBM node on DB failure...");
//destinations
stopServices(destinations);
//connection factories
stopServices(connectionFactories);
//post office
ObjectName postOfficeServiceName = new ObjectName(postOffice);
getShutdownDelay(postOfficeServiceName);
stopService(postOfficeServiceName);
//server peer
ObjectName serverPeerName = new ObjectName(serverPeer);
stopService(serverPeerName);
nodeStopped = true;
nodeRecovery = new NodeRecovery();
nodeRecovery.start();
log.info("JBM node is stopped.");
}
private void getShutdownDelay(ObjectName postOfficeServiceName)
{
try
{
long nodeRefreshInterval = (Long)server.getAttribute(postOfficeServiceName, "NodeStateRefreshInterval");
shutdownDelay = nodeRefreshInterval * 2;
}
catch (Exception e)
{
log.warn("Failed to get node refresh interval, use default.", e);
shutdownDelay = 30000;
}
}
private void stopService(ObjectName service) throws Exception
{
try
{
server.invoke(service, "stop", new Object[0], new String[0]);
log.debug("Service " + serviceName + " stopped.");
}
catch (Exception e)
{
log.warn("Error stopping service " + serviceName, e);
}
}
private void stopServices(List<ObjectName> services) throws Exception
{
Iterator<ObjectName> iter = services.iterator();
while (iter.hasNext())
{
ObjectName serviceName = iter.next();
stopService(serviceName);
}
}
public void setServerPeer(String serverPeer)
{
this.serverPeer = serverPeer;
}
public String getServerPeer()
{
return serverPeer;
}
public void setPostOffice(String postOffice)
{
this.postOffice = postOffice;
}
public String getPostOffice()
{
return postOffice;
}
public void setPersistenceManager(String persistenceManager)
{
this.persistenceManager = persistenceManager;
}
public String getPersistenceManager()
{
return persistenceManager;
}
private boolean checkDBConnection() throws Exception
{
ObjectName pmName = new ObjectName(persistenceManager);
PersistenceManager pm = (PersistenceManager)JMXAccessor.getJMXAttributeOverSecurity(server, pmName, "Instance");
boolean isConnOK = false;
try
{
isConnOK = pm.checkConnection();
}
catch (Exception e)
{
log.warn("failed to check connection", e);
isConnOK = false;
}
return isConnOK;
}
private synchronized void restartJBMNode() throws Exception
{
if (!nodeStopped) return;
makeSureDelay();
log.info("Restarting JBM node...");
//start server peer
ObjectName spName = new ObjectName(serverPeer);
startService(spName);
//starat post office
ObjectName poName = new ObjectName(postOffice);
startService(poName);
//wait for jgroups back
MessagingPostOffice pm = (MessagingPostOffice)JMXAccessor.getJMXAttributeOverSecurity(server, poName, "Instance");
while (!pm.waitForJGroups())
{
log.info("Failed to start post office due to JGroups failure, retrying...");
this.stopService(poName);
makeSureDelay();
this.startService(poName);
pm = (MessagingPostOffice)JMXAccessor.getJMXAttributeOverSecurity(server, poName, "Instance");
}
List<ObjectName> copy = new ArrayList<ObjectName>(connectionFactories);
connectionFactories.clear();
//start cf
startServices(copy);
copy = new ArrayList<ObjectName>(destinations);
destinations.clear();
//destinations
startServices(copy);
nodeStopped = false;
log.info("JBM node restarted.");
}
private void makeSureDelay()
{
long delay = shutdownDelay;
long stopTime = System.currentTimeMillis();
while (delay > 0)
{
try
{
Thread.sleep(delay);
}
catch (InterruptedException e)
{
}
delay = shutdownDelay - (System.currentTimeMillis() - stopTime);
}
}
private void startService(ObjectName serviceName) throws Exception
{
server.invoke(serviceName, "start", new Object[0], new String[0]);
log.debug("Service " + serviceName + " started.");
}
private void startServices(List<ObjectName> services) throws Exception
{
Iterator<ObjectName> iter = services.iterator();
while (iter.hasNext())
{
ObjectName serviceName = iter.next();
startService(serviceName);
}
}
private class NodeRecovery extends Thread
{
private boolean keepTrying = true;
public NodeRecovery()
{
this.setDaemon(true);
}
public synchronized void abandon()
{
keepTrying = false;
notify();
}
public synchronized void run()
{
try
{
while (keepTrying)
{
if (checkDBConnection())
{
restartJBMNode();
break;
}
try
{
wait(5000);
}
catch (InterruptedException e)
{
//ignore.
}
}
}
catch (Exception e)
{
log.error("Getting exception, stop recovery.", e);
}
}
}
public void registerFactory(ObjectName serviceName)
{
synchronized(connectionFactories)
{
connectionFactories.add(serviceName);
log.info("Registered connection factory " + serviceName);
}
}
public void registerDestination(ObjectName serviceName)
{
synchronized(destinations)
{
destinations.add(serviceName);
log.info("Registered destination " + serviceName);
}
}
}