User: juhalindfors
Date: 02/01/23 14:08:32
Added: src/main/org/jboss/mx/interceptor
PersistenceInterceptor.java
Log:
Revision Changes Path
1.1
jmx/src/main/org/jboss/mx/interceptor/PersistenceInterceptor.java
Index: PersistenceInterceptor.java
===================================================================
/*
* JBoss, the OpenSource J2EE webOS
*
* Distributable under LGPL license.
* See terms of license at gnu.org.
*/
package org.jboss.mx.interceptor;
import java.util.HashMap;
import java.util.Date;
import javax.management.Descriptor;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import javax.management.PersistentMBean;
import javax.management.Notification;
import javax.management.NotificationFilter;
import javax.management.NotificationListener;
import javax.management.MBeanException;
import javax.management.InstanceNotFoundException;
import javax.management.timer.Timer;
import javax.management.timer.TimerMBean;
import org.jboss.mx.modelmbean.ModelMBeanConstants;
import org.jboss.mx.service.ServiceConstants;
import org.jboss.mx.util.MBeanProxy;
import org.jboss.mx.util.AgentID;
/**
*
*
* @see javax.management.PersistentMBean
*
* @author <a href="mailto:[EMAIL PROTECTED]";>Juha Lindfors</a>.
* @version $Revision: 1.1 $
*
*/
public class PersistenceInterceptor
extends Interceptor
implements ModelMBeanConstants, ServiceConstants
{
// Attributes ----------------------------------------------------
private HashMap attrPersistencePolicies = new HashMap();
private String mbeanPersistencePolicy = null;
private MBeanServer server = null;
private PersistentMBean callback = null;
// FIXME: observable descriptors
// Constructors --------------------------------------------------
public PersistenceInterceptor(MBeanServer server, PersistentMBean callback,
Descriptor[] descriptors)
{
super("MBean Persistence Interceptor");
this.server = server;
this.callback = callback;
for (int i = 0; i < descriptors.length; ++i)
{
String policy = (String)descriptors[i].getFieldValue(PERSIST_POLICY);
String persistPeriod = (String)descriptors[i].getFieldValue(PERSIST_PERIOD);
if
(((String)descriptors[i].getFieldValue(DESCRIPTOR_TYPE)).equalsIgnoreCase(MBEAN_DESCRIPTOR))
{
if (policy == null)
mbeanPersistencePolicy = NEVER;
else
mbeanPersistencePolicy = policy;
if (mbeanPersistencePolicy.equalsIgnoreCase(ON_TIMER))
schedulePersistenceNotifications(Long.parseLong(persistPeriod),
MBEAN_DESCRIPTOR);
}
else
{
String name = (String)descriptors[i].getFieldValue(NAME);
attrPersistencePolicies.put(name, policy);
// FIXME FIXME FIXME FIXME
if (policy/*mbeanPersistencePolicy*/.equalsIgnoreCase(ON_TIMER))
schedulePersistenceNotifications(Long.parseLong(persistPeriod), name);
}
}
}
// Public --------------------------------------------------------
public Object invoke(Invocation invocation) throws InvocationException
{
if (invocation.getInvocationType() == Invocation.OPERATION)
return getNext().invoke(invocation);
String policy = (String)attrPersistencePolicies.get(invocation.getName());
if (policy == null)
policy = mbeanPersistencePolicy;
if (policy.equalsIgnoreCase(NEVER) || policy.equalsIgnoreCase(ON_TIMER))
return getNext().invoke(invocation);
else if (policy.equalsIgnoreCase(ON_UPDATE))
{
Object returnValue = getNext().invoke(invocation);
try
{
callback.store();
}
catch (Throwable t)
{
// FIXME: check the exception handling
throw new InvocationException(t, "Cannot persist the MBean data.");
}
return returnValue;
}
// FIXME: NO_MORE_OFTEN_THAN policy
else
throw new Error("NoMoreOftenThan: NYI");
}
private void schedulePersistenceNotifications(long persistPeriod, String name)
{
// FIXME: unschedule on unregistration/descriptor field change
try
{
ObjectName timerName = new ObjectName(PERSISTENCE_TIMER);
TimerMBean timer = (TimerMBean)MBeanProxy.create(Timer.class,
TimerMBean.class, timerName, server);
timer.start();
// FIXME FIXME FIXME FIXME
// if (!server.isRegistered(timerName))
// timer.start();
timer.addNotification(
"persistence.timer.notification",
null, // msg
name, // userData
new Date(System.currentTimeMillis()), // timestamp
persistPeriod
);
server.addNotificationListener(
timerName,
new PersistenceNotificationListener(),
new PersistenceNotificationFilter(name),
null
);
}
catch (Throwable t)
{
// FIXME: maybe just log exception and switch to NEVER policy
throw new Error(t.toString());
}
}
// Inner classes -------------------------------------------------
private class PersistenceNotificationListener
implements NotificationListener
{
// NotificationFilter implementation --------------------------
public void handleNotification(Notification notification, Object handback)
{
try
{
// FIXME: add PersistenceContext field to MBean's descriptor to
// relay attribute name (and possibly other) info with the
// persistence callback
callback.store();
}
catch (MBeanException e)
{
// FIXME: log exception
}
catch (InstanceNotFoundException e)
{
// FIXME: log exception
}
}
}
private class PersistenceNotificationFilter
implements NotificationFilter
{
// Attributes -------------------------------------------------
private String name = null;
// Constructors -----------------------------------------------
public PersistenceNotificationFilter(String attrName)
{
this.name = attrName;
}
// NotificationFilter implementation --------------------------
public boolean isNotificationEnabled(Notification notification)
{
if (notification.getUserData().equals(name))
return true;
return false;
}
}
}
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