You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@commons.apache.org by co...@apache.org on 2002/11/05 20:13:43 UTC
cvs commit: jakarta-commons/modeler/src/java/org/apache/commons/modeler JndiJmx.java
costin 2002/11/05 11:13:42
Added: modeler/src/java/org/apache/commons/modeler JndiJmx.java
Log:
A better solution to intercept the attribute setting and instances.
Use the standard notification - will work for any mbean supporting
the attribute change notification.
The goal is to persist the config data that is changed via JMX -
without saving all the attributes.
Jndi is used because (IMO) it is the natural API for that.
Revision Changes Path
1.1 jakarta-commons/modeler/src/java/org/apache/commons/modeler/JndiJmx.java
Index: JndiJmx.java
===================================================================
/*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001-2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Commons", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* [Additional notices, if required by prior licensing conditions]
*
*/
package org.apache.commons.modeler;
import java.io.*;
import java.net.URL;
import java.lang.reflect.InvocationTargetException;
import java.util.*;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
// Depends on JNDI - if a DirContext is provided we'll push info into it.
import javax.naming.*;
import javax.naming.directory.*;
import javax.management.*;
// EXPERIMENTAL. It may fit better in tomcat jndi impl.
/**
*
* Link between JNDI and JMX. JNDI can be used for persistence ( it is
* an API for storing hierarchical data and a perfect fit for that ), as
* well as an alternate view of the MBean registry.
*
* If this component is enabled, all MBeans will be registered in JNDI, and
* all attributes that are set via JMX can be stored in a DirContext.
*
* @author Costin Manolache
*/
public class JndiJmx implements NotificationListener {
private static Log log= LogFactory.getLog(JndiJmx.class);
protected Context componentContext;
protected Context descriptorContext;
protected Context configContext;
MBeanServer mserver;
/**
* Protected constructor to require use of the factory create method.
*/
public JndiJmx() {
}
/** If a JNDI context is set, all components
* will be registered in the context.
*
* @param ctx
*/
public void setComponentContext(Context ctx) {
this.componentContext= ctx;
}
/** JNDI context for component descriptors ( metadata ).
*
* @param ctx
*/
public void setDescriptorContext(Context ctx) {
this.descriptorContext= ctx;
}
/** JNDI context where attributes will be stored for persistence
*
*/
public void setConfigContext( Context ctx ) {
this.configContext= ctx;
}
// -------------------- Registration/unregistration --------------------
// temp - will only set in the jndi contexts
Hashtable attributes=new Hashtable();
Hashtable instances=new Hashtable();
public void handleNotification(Notification notification, Object handback)
{
// register/unregister mbeans in jndi
if( notification instanceof MBeanServerNotification ) {
MBeanServerNotification msnot=(MBeanServerNotification)notification;
ObjectName oname=msnot.getMBeanName();
if( "jmx.mbean.created".equalsIgnoreCase( notification.getType() )) {
try {
Object mbean=mserver.getObjectInstance(oname);
if( log.isDebugEnabled() )
log.debug( "MBean created " + oname + " " + mbean);
// XXX add filter support
if( mbean instanceof NotificationBroadcaster ) {
// register for attribute changes
NotificationBroadcaster nb=(NotificationBroadcaster)mbean;
nb.addNotificationListener(this, null, null);
if( log.isDebugEnabled() )
log.debug( "Add attribute change listener");
}
instances.put( oname.toString(), mbean );
} catch( InstanceNotFoundException ex ) {
log.error( "Instance not found for the created object", ex );
}
}
if( "jmx.mbean.deleted".equalsIgnoreCase( notification.getType() )) {
instances.remove(oname.toString());
}
}
// set attributes in jndi
// if( "jmx.attribute.changed".equals( notification.getType() )) {
if( notification instanceof AttributeChangeNotification) {
AttributeChangeNotification anotif=(AttributeChangeNotification)notification;
String name=anotif.getAttributeName();
Object value=anotif.getNewValue();
Object source=anotif.getSource();
log.debug( "Attribute change notification " + name + " " + value + " " + source );
}
}
public void init() throws Exception {
MBeanServer mserver=(MBeanServer)Registry.getRegistry().getMBeanServer();
ObjectName delegate=new ObjectName("JMImplementation:type=MBeanServerDelegate");
// we'll know of all registered beans
mserver.addNotificationListener(delegate, this, null, null );
}
}
--
To unsubscribe, e-mail: <ma...@jakarta.apache.org>
For additional commands, e-mail: <ma...@jakarta.apache.org>