Commons Modeler example source code file (Demo.java)
The Commons Modeler Demo.java source code
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.modeler.demo;
import java.io.InputStream;
import java.net.URL;
import java.util.Iterator;
import javax.management.Attribute;
import javax.management.Descriptor;
import javax.management.MBeanAttributeInfo;
import javax.management.MBeanConstructorInfo;
import javax.management.MBeanException;
import javax.management.MBeanNotificationInfo;
import javax.management.MBeanOperationInfo;
import javax.management.MBeanServer;
import javax.management.MBeanServerFactory;
import javax.management.Notification;
import javax.management.NotificationListener;
import javax.management.ObjectInstance;
import javax.management.ObjectName;
import javax.management.modelmbean.ModelMBean;
import javax.management.modelmbean.ModelMBeanInfo;
import org.apache.commons.modeler.ManagedBean;
import org.apache.commons.modeler.Registry;
/**
* <p>Demonstration program for the Modeller package. Instantiates a set
* of simple managed objects, and a set of corresponding MBeans, then
* manipulates the objects through the MBean interfaces.
*
* @author Craig R. McClanahan
* @version $Revision: 480402 $ $Date: 2006-11-29 04:43:23 +0000 (Wed, 29 Nov 2006) $
*/
public class Demo implements NotificationListener {
// ----------------------------------------------------- Instance Variables
// ------------------------------------------------------- Instance Methods
/**
* Handle the notification of a JMX event.
*
* @param notification The event that has occurred
* @param handback The handback object for this event
*/
public void handleNotification(Notification notification,
Object handback) {
System.out.println("NOTIFICATION=" + notification +
", HANDBACK=" + handback);
}
// ------------------------------------------------------- Static Variables
/**
* The attribute notification listener.
*/
private static Demo demo = null;
/**
* The configuration information registry for our managed beans.
*/
private static Registry registry = null;
/**
* The <code>MBeanServer for this application.
*/
private static MBeanServer server = null;
/**
* The managed object tree.
*/
private static Server tree = null;
// ----------------------------------------------------------- Main Program
/**
* The main program for this demonstration.
*
* @param args Command line arguments
*/
public static void main(String arg[]) {
createRegistry();
createServer();
createTree();
createMBeans();
listMBeans();
dumpServer();
updateServer();
}
// -------------------------------------------------------- Support Methods
/**
* Create the MBeans that correspond to every node of our tree.
*/
private static void createMBeans() {
try {
// NOTE: JMXRI crashes on server.setAttribute() unless there has
// been an attribute change listener registered at some point
// on every ModelMBean. :-(
// NOTE: Despite the documentation, you cannot register an
// attribute change listener for all attributes. :-(
Demo demo = new Demo();
System.out.println("Creating MBeans ...");
// Create the MBean for the top-level Server object
String domain = server.getDefaultDomain();
ManagedBean managed = registry.findManagedBean("StandardServer");
ModelMBean mm = managed.createMBean(tree);
mm.addAttributeChangeNotificationListener(demo, "shutdown", tree);
mm.addAttributeChangeNotificationListener(demo, "port", tree);
server.registerMBean(mm, createName(domain, tree));
// Create the MBean for each associated Service and friendes
Service services[] = tree.findServices();
for (int i = 0; i < services.length; i++) {
// The MBean for the Service itself
managed = registry.findManagedBean("StandardService");
mm = managed.createMBean(services[i]);
mm.addAttributeChangeNotificationListener(demo, "name",
services[i]);
server.registerMBean(mm, createName(domain, services[i]));
// The MBean for the corresponding Engine
managed = registry.findManagedBean("StandardEngine");
Engine container = (Engine) services[i].getContainer();
mm = managed.createMBean(container);
mm.addAttributeChangeNotificationListener(demo, "name",
container);
server.registerMBean(mm, createName(domain, container));
// The MBeans for the corresponding Connectors
managed = registry.findManagedBean("HttpConnector");
Connector connectors[] = services[i].findConnectors();
for (int j = 0; j < connectors.length; j++) {
mm = managed.createMBean(connectors[j]);
mm.addAttributeChangeNotificationListener(demo, "port",
connectors[j]);
server.registerMBean
(mm, createName(domain, connectors[j]));
}
}
} catch (MBeanException t) {
Exception e = t.getTargetException();
if (e == null)
e = t;
System.out.println(e.getMessage());
e.printStackTrace(System.out);
} catch (Throwable t) {
System.out.println(t.getMessage());
t.printStackTrace(System.out);
}
}
/**
* Create an <code>ObjectName for this object.
*
* @param domain Domain in which this name is to be created
* @param connector The Connector to be named
*/
private static ObjectName createName(String domain, Connector connector) {
ObjectName name = null;
try {
name = new ObjectName(domain + ":type=Connector,port=" +
connector.getPort() + ",service=" +
connector.getService().getName());
} catch (Throwable t) {
System.out.println("Creating name for " + connector);
t.printStackTrace(System.out);
System.exit(1);
}
return (name);
}
/**
* Create an <code>ObjectName for this object.
*
* @param domain Domain in which this name is to be created
* @param engine The Engine to be named
*/
private static ObjectName createName(String domain, Engine engine) {
ObjectName name = null;
try {
name = new ObjectName(domain + ":type=Engine,service=" +
engine.getService().getName());
} catch (Throwable t) {
System.out.println("Creating name for " + engine);
t.printStackTrace(System.out);
System.exit(1);
}
return (name);
}
/**
* Create an <code>ObjectName for this object.
*
* @param domain Domain in which this name is to be created
* @param server The Server to be named
*/
private static ObjectName createName(String domain, Server server) {
ObjectName name = null;
try {
name = new ObjectName(domain + ":type=Server");
} catch (Throwable t) {
System.out.println("Creating name for " + server);
t.printStackTrace(System.out);
System.exit(1);
}
return (name);
}
/**
* Create an <code>ObjectName for this object.
*
* @param domain Domain in which this name is to be created
* @param service The Service to be named
*/
private static ObjectName createName(String domain, Service service) {
ObjectName name = null;
try {
name = new ObjectName(domain + ":type=Service,name=" +
service.getName());
} catch (Throwable t) {
System.out.println("Creating name for " + server);
t.printStackTrace(System.out);
System.exit(1);
}
return (name);
}
/**
* Create and configure the registry of managed objects.
*/
private static void createRegistry() {
System.out.println("Create configuration registry ...");
try {
URL url = Demo.class.getResource
("/org/apache/commons/modeler/demo/mbeans-descriptors.xml");
InputStream stream = url.openStream();
Registry.loadRegistry(stream);
stream.close();
registry = Registry.getRegistry();
} catch (Throwable t) {
t.printStackTrace(System.out);
System.exit(1);
}
}
/**
* Create the <code>MBeanServer with which we will be
* registering our <code>ModelMBean implementations.
*/
private static void createServer() {
System.out.println("Creating MBeanServer ...");
try {
// System.setProperty("LEVEL_TRACE", "true");
server = MBeanServerFactory.createMBeanServer();
} catch (Throwable t) {
t.printStackTrace(System.out);
System.exit(1);
}
}
/**
* Create the tree of managed objects.
*/
private static void createTree() {
System.out.println("Create managed object tree ...");
tree = new Server(8005, "SHUTDOWN");
Service service = new Service("Standard Service", tree);
tree.addService(service);
Engine engine = new Engine("Standard Engine", "localhost", service);
service.setContainer(engine);
Connector conn1 = new Connector(8080, "http", false,
service, engine);
service.addConnector(conn1);
Connector conn2 = new Connector(8443, "https", true,
service, engine);
service.addConnector(conn2);
}
/**
* Dump known information about the "Server" we are managing.
*/
private static void dumpServer() {
try {
System.out.println("Dump ModelMBeanInfo for Server:");
ObjectName name =
new ObjectName(server.getDefaultDomain() + ":type=Server");
// Return static ModelMBeanInfo information
ModelMBeanInfo info = (ModelMBeanInfo) server.getMBeanInfo(name);
System.out.println(" className=" + info.getClassName());
System.out.println(" description=" + info.getDescription());
System.out.println(" mbeanDescriptor=" + info.getMBeanDescriptor());
MBeanAttributeInfo attrs[] = info.getAttributes();
for (int i = 0; i < attrs.length; i++)
System.out.println(" AttributeInfo=" + attrs[i]);
MBeanConstructorInfo consts[] = info.getConstructors();
for (int i = 0; i < consts.length; i++)
System.out.println(" ConstructorInfo=" + consts[i]);
Descriptor descs[] = info.getDescriptors(null);
for (int i = 0; i < descs.length; i++)
System.out.println(" Descriptor=" + descs[i]);
MBeanNotificationInfo notifs[] = info.getNotifications();
for (int i = 0; i < notifs.length; i++)
System.out.println(" Notification=" + notifs[i]);
MBeanOperationInfo opers[] = info.getOperations();
for (int i = 0; i < opers.length; i++)
System.out.println(" Operation=" + opers[i]);
} catch (MBeanException t) {
Exception e = t.getTargetException();
if (e == null)
e = t;
System.out.println(e.getMessage());
e.printStackTrace(System.out);
} catch (Throwable t) {
System.out.println(t.getMessage());
t.printStackTrace(System.out);
}
}
/**
* List information about all registered MBeans.
*/
private static void listMBeans() {
System.out.println("There are " + server.getMBeanCount().intValue() +
" registered MBeans");
Iterator instances = server.queryMBeans(null, null).iterator();
while (instances.hasNext()) {
ObjectInstance instance = (ObjectInstance) instances.next();
System.out.println(" objectName=" + instance.getObjectName() +
", className=" + instance.getClassName());
}
}
/**
* Test updating an attribute through the JMX interfaces.
*/
private static void updateServer() {
try {
System.out.println("===========================================");
System.out.println("Test updating Server properties ...");
ObjectName name =
new ObjectName(server.getDefaultDomain() + ":type=Server");
System.out.println(" Retrieving current value of 'shutdown'");
String value = (String) server.getAttribute(name, "shutdown");
if (!"SHUTDOWN".equals(value))
throw new IllegalStateException("Current shutdown value is '" +
value + "'");
System.out.println(" Setting new value of 'shutdown'");
server.setAttribute(name,
new Attribute("shutdown", "NEW VALUE"));
System.out.println(" Checking new value of 'shutdown'");
value = (String) server.getAttribute(name, "shutdown");
if (!"NEW VALUE".equals(value))
throw new IllegalStateException("New shutdown value is '" +
value + "'");
System.out.println("===========================================");
System.out.println("Test updating Server properties ...");
System.out.println(" Retrieving current value of 'port'");
Integer ivalue = (Integer) server.getAttribute(name, "port");
if (ivalue.intValue() != 8005)
throw new IllegalStateException("Current port value is '" +
ivalue + "'");
System.out.println(" Setting new value of 'port'");
server.setAttribute(name,
new Attribute("port", new Integer(8765)));
/*
server.invoke(name, "setPort",
new Object[] { new java.lang.Integer(8765) },
new String[] { "int" });
*/
System.out.println(" Checking new value of 'port'");
ivalue = (Integer) server.getAttribute(name, "port");
if (ivalue.intValue() != 8765)
throw new IllegalStateException("New port value is '" +
ivalue + "'");
} catch (MBeanException t) {
Exception e = t.getTargetException();
if (e == null)
e = t;
System.out.println(e.getMessage());
e.printStackTrace(System.out);
} catch (Throwable t) {
System.out.println(t.getMessage());
t.printStackTrace(System.out);
}
}
}
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