/*
* JBoss, Home of Professional Open Source.
* Copyright 2008, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file 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.monitor;
import org.jboss.system.ServiceMBeanSupport;
import org.jboss.logging.Logger;
import javax.management.ObjectName;
import java.util.ArrayList;
/**
* Comment
*
* @author <a href="mailto:bill@jboss.org">Bill Burke</a>
* @version $Revision: 89151 $
*
**/
public abstract class JBossMonitor extends ServiceMBeanSupport implements Runnable, JBossMonitorMBean
{
protected Logger log;
protected String monitorName;
protected ObjectName observedObject;
protected String attribute;
protected boolean enabled;
protected boolean alertSent = false;
protected long period;
protected ArrayList alertListeners = null;
protected String thresholdString;
protected Object triggeredAttributeValue;
protected long triggerTime;
protected void startService
() throws Exception
{
super.startService();
log = Logger.getLogger(monitorName);
if (alertListeners != null)
{
for (int i = 0; i < alertListeners.size(); i++)
{
ObjectName aname = (ObjectName)alertListeners.get(i);
getServer().addNotificationListener(getServiceName(), aname, null, null);
}
}
if (enabled)
{
startMonitorThread();
}
}
protected void stopService()
{
enabled = false; // to shutdown monitor thread
}
protected void startMonitorThread()
{
Thread t = new Thread(this, "JBoss JMX Attribute Monitor " + monitorName);
t.start();
}
protected abstract void testThreshold();
public String getMonitorName()
{
return monitorName;
}
public void setMonitorName(String name)
{
monitorName = name;
}
public ObjectName getObservedObject()
{
return observedObject;
}
public void setObservedObject(ObjectName oname)
{
this.observedObject = oname;
}
public String getObservedAttribute()
{
return attribute;
}
public void setObservedAttribute(String attr)
{
attribute = attr;
}
public boolean alerted()
{
return alertSent;
}
public void clearAlert()
{
alertSent = false;
triggeredAttributeValue = null;
triggerTime = 0;
}
public boolean getEnabled()
{
return enabled;
}
public void setEnabled(boolean start)
{
if (start == enabled) return;
enabled = start;
// only start monitor thread if mbean is started and
// we have a state change from enabled == false to enabled == true
if (start && getState() == STARTED)
{
startMonitorThread();
}
}
public long getPeriod()
{
return period;
}
public void setPeriod(long period)
{
this.period = period;
}
public ArrayList getAlertListeners()
{
return alertListeners;
}
public void setAlertListeners(ArrayList listeners)
{
if (alertListeners != null && getState() == STARTED)
{
// remove old listeners
ArrayList copy = new ArrayList(listeners);
for (int i = 0; i < alertListeners.size(); i++)
{
ObjectName oname = (ObjectName)alertListeners.get(i);
int idx = copy.indexOf(oname);
if (idx == -1)
{
try
{
getServer().removeNotificationListener(getServiceName(), oname);
}
catch (Exception ex)
{
getLog().warn("failed to remove listener", ex);
}
}
else
{
copy.remove(idx);
}
}
// copy has all the new listeners
for (int i = 0; i < copy.size(); i++)
{
ObjectName aname = (ObjectName)copy.get(i);
try
{
getServer().addNotificationListener(getServiceName(), aname, null, null);
}
catch (Exception ex)
{
getLog().warn("failed to remove listener", ex);
}
}
}
alertListeners = listeners;
}
public Object getTriggeredAttributeValue()
{
return triggeredAttributeValue;
}
public long getTriggerTime()
{
return triggerTime;
}
public void run()
{
boolean intr = false;
try
{
while (this.getState() == STARTED || this.getState() == STARTING)
{
if (enabled)
{
try
{
testThreshold();
}
catch (Exception ex)
{
log.error(monitorName + " had error while monitoring", ex);
}
}
try
{
Thread.sleep(period);
}
catch (InterruptedException ignored)
{
intr = true;
}
}
}
finally
{
if (intr) Thread.currentThread().interrupt();
}
}
public String getThreshold()
{
return thresholdString;
}
public void setThreshold(String val)
{
thresholdString = val;
}
}