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The Commons Modeler ManagedBean.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;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.management.Descriptor;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanException;
import javax.management.RuntimeOperationsException;
import javax.management.modelmbean.InvalidTargetObjectTypeException;
import javax.management.modelmbean.ModelMBean;
import javax.management.modelmbean.ModelMBeanAttributeInfo;
import javax.management.modelmbean.ModelMBeanConstructorInfo;
import javax.management.modelmbean.ModelMBeanInfo;
import javax.management.modelmbean.ModelMBeanInfoSupport;
import javax.management.modelmbean.ModelMBeanNotificationInfo;
import javax.management.modelmbean.ModelMBeanOperationInfo;
/**
* <p>Internal configuration information for a managed bean (MBean)
* descriptor.</p>
*
* @author Craig R. McClanahan
* @version $Revision: 480402 $ $Date: 2006-11-29 04:43:23 +0000 (Wed, 29 Nov 2006) $
*/
public class ManagedBean implements java.io.Serializable
{
// ----------------------------------------------------- Instance Variables
/**
* The <code>ModelMBeanInfo object that corresponds
* to this <code>ManagedBean instance.
*/
transient ModelMBeanInfo info = null;
protected AttributeInfo attributes[] = new AttributeInfo[0];
protected String className =
"org.apache.commons.modeler.BaseModelMBean";
protected ConstructorInfo constructors[] = new ConstructorInfo[0];
protected String description = null;
protected String domain = null;
protected String group = null;
protected String name = null;
protected List fields = new ArrayList();
protected NotificationInfo notifications[] = new NotificationInfo[0];
protected OperationInfo operations[] = new OperationInfo[0];
protected String type = null;
/** Constructor. Will add default attributes.
*
*/
public ManagedBean() {
AttributeInfo ai=new AttributeInfo();
ai.setName("modelerType");
ai.setDescription("Type of the modeled resource. Can be set only once");
ai.setType("java.lang.String");
ai.setWriteable(false);
addAttribute(ai);
}
// ------------------------------------------------------------- Properties
/**
* The collection of attributes for this MBean.
*/
public AttributeInfo[] getAttributes() {
return (this.attributes);
}
/**
* The fully qualified name of the Java class of the MBean
* described by this descriptor. If not specified, the standard JMX
* class (<code>javax.management.modelmbean.RequiredModeLMBean)
* will be utilized.
*/
public String getClassName() {
return (this.className);
}
public void setClassName(String className) {
this.className = className;
this.info = null;
}
/**
* The collection of constructors for this MBean.
*/
public ConstructorInfo[] getConstructors() {
return (this.constructors);
}
/**
* The human-readable description of this MBean.
*/
public String getDescription() {
return (this.description);
}
public void setDescription(String description) {
this.description = description;
this.info = null;
}
/**
* The (optional) <code>ObjectName domain in which this MBean
* should be registered in the MBeanServer.
*/
public String getDomain() {
return (this.domain);
}
public void setDomain(String domain) {
this.domain = domain;
}
/**
* <p>Return a List of the {@link FieldInfo} objects for
* the name/value pairs that should be
* added to the Descriptor created from this metadata.</p>
*/
public List getFields() {
return (this.fields);
}
/**
* The (optional) group to which this MBean belongs.
*/
public String getGroup() {
return (this.group);
}
public void setGroup(String group) {
this.group = group;
}
/**
* The name of this managed bean, which must be unique among all
* MBeans managed by a particular MBeans server.
*/
public String getName() {
return (this.name);
}
public void setName(String name) {
this.name = name;
this.info = null;
}
/**
* The collection of notifications for this MBean.
*/
public NotificationInfo[] getNotifications() {
return (this.notifications);
}
/**
* The collection of operations for this MBean.
*/
public OperationInfo[] getOperations() {
return (this.operations);
}
/**
* The fully qualified name of the Java class of the resource
* implementation class described by the managed bean described
* by this descriptor.
*/
public String getType() {
return (this.type);
}
public void setType(String type) {
this.type = type;
this.info = null;
}
// --------------------------------------------------------- Public Methods
/**
* Add a new attribute to the set of attributes for this MBean.
*
* @param attribute The new attribute descriptor
*/
public void addAttribute(AttributeInfo attribute) {
synchronized (attributes) {
AttributeInfo results[] =
new AttributeInfo[attributes.length + 1];
System.arraycopy(attributes, 0, results, 0, attributes.length);
results[attributes.length] = attribute;
attributes = results;
this.info = null;
}
}
/**
* Add a new constructor to the set of constructors for this MBean.
*
* @param constructor The new constructor descriptor
*/
public void addConstructor(ConstructorInfo constructor) {
synchronized (constructors) {
ConstructorInfo results[] =
new ConstructorInfo[constructors.length + 1];
System.arraycopy(constructors, 0, results, 0, constructors.length);
results[constructors.length] = constructor;
constructors = results;
this.info = null;
}
}
/**
* <p>Add a new field to the fields associated with the
* Descriptor that will be created from this metadata.</p>
*
* @param field The field to be added
*/
public void addField(FieldInfo field) {
fields.add(field);
}
/**
* Add a new notification to the set of notifications for this MBean.
*
* @param notification The new notification descriptor
*/
public void addNotification(NotificationInfo notification) {
synchronized (notifications) {
NotificationInfo results[] =
new NotificationInfo[notifications.length + 1];
System.arraycopy(notifications, 0, results, 0,
notifications.length);
results[notifications.length] = notification;
notifications = results;
this.info = null;
}
}
/**
* Add a new operation to the set of operations for this MBean.
*
* @param operation The new operation descriptor
*/
public void addOperation(OperationInfo operation) {
synchronized (operations) {
OperationInfo results[] =
new OperationInfo[operations.length + 1];
System.arraycopy(operations, 0, results, 0, operations.length);
results[operations.length] = operation;
operations = results;
this.info = null;
}
}
/**
* Create and return a <code>ModelMBean that has been
* preconfigured with the <code>ModelMBeanInfo information
* for this managed bean, but is not associated with any particular
* managed resource. The returned <code>ModelMBean will
* <strong>NOT have been registered with our
* <code>MBeanServer.
*
* @exception InstanceNotFoundException if the managed resource
* object cannot be found
* @exception InvalidTargetObjectTypeException if our MBean cannot
* handle object references (should never happen)
* @exception MBeanException if a problem occurs instantiating the
* <code>ModelMBean instance
* @exception RuntimeOperationsException if a JMX runtime error occurs
*/
public ModelMBean createMBean()
throws InstanceNotFoundException,
InvalidTargetObjectTypeException,
MBeanException, RuntimeOperationsException {
return (createMBean(null));
}
/**
* Create and return a <code>ModelMBean that has been
* preconfigured with the <code>ModelMBeanInfo information
* for this managed bean, and is associated with the specified
* managed object instance. The returned <code>ModelMBean
* will <strong>NOT have been registered with our
* <code>MBeanServer.
*
* @param instance Instanced of the managed object, or <code>null
* for no associated instance
*
* @exception InstanceNotFoundException if the managed resource
* object cannot be found
* @exception InvalidTargetObjectTypeException if our MBean cannot
* handle object references (should never happen)
* @exception MBeanException if a problem occurs instantiating the
* <code>ModelMBean instance
* @exception RuntimeOperationsException if a JMX runtime error occurs
*/
public ModelMBean createMBean(Object instance)
throws InstanceNotFoundException,
InvalidTargetObjectTypeException,
MBeanException, RuntimeOperationsException {
// Load the ModelMBean implementation class
Class clazz = null;
Exception ex = null;
try {
clazz = Class.forName(getClassName());
} catch (Exception e) {
}
if( clazz==null ) {
try {
ClassLoader cl= Thread.currentThread().getContextClassLoader();
if ( cl != null)
clazz= cl.loadClass(getClassName());
} catch (Exception e) {
ex=e;
}
}
if( clazz==null) {
throw new MBeanException
(ex, "Cannot load ModelMBean class " + getClassName());
}
// Create a new ModelMBean instance
ModelMBean mbean = null;
try {
mbean = (ModelMBean) clazz.newInstance();
mbean.setModelMBeanInfo(createMBeanInfo());
} catch (MBeanException e) {
throw e;
} catch (RuntimeOperationsException e) {
throw e;
} catch (Exception e) {
throw new MBeanException
(e, "Cannot instantiate ModelMBean of class " +
getClassName());
}
// Set the managed resource (if any)
try {
if (instance != null)
mbean.setManagedResource(instance, "ObjectReference");
} catch (InstanceNotFoundException e) {
throw e;
} catch (InvalidTargetObjectTypeException e) {
throw e;
}
return (mbean);
}
/**
* Create and return a <code>ModelMBeanInfo object that
* describes this entire managed bean.
*/
public ModelMBeanInfo createMBeanInfo() {
// Return our cached information (if any)
if (info != null)
return (info);
// Create subordinate information descriptors as required
AttributeInfo attrs[] = getAttributes();
ModelMBeanAttributeInfo attributes[] =
new ModelMBeanAttributeInfo[attrs.length];
for (int i = 0; i < attrs.length; i++)
attributes[i] = attrs[i].createAttributeInfo();
ConstructorInfo consts[] = getConstructors();
ModelMBeanConstructorInfo constructors[] =
new ModelMBeanConstructorInfo[consts.length];
for (int i = 0; i < consts.length; i++)
constructors[i] = consts[i].createConstructorInfo();
NotificationInfo notifs[] = getNotifications();
ModelMBeanNotificationInfo notifications[] =
new ModelMBeanNotificationInfo[notifs.length];
for (int i = 0; i < notifs.length; i++)
notifications[i] = notifs[i].createNotificationInfo();
OperationInfo opers[] = getOperations();
ModelMBeanOperationInfo operations[] =
new ModelMBeanOperationInfo[opers.length];
for (int i = 0; i < opers.length; i++)
operations[i] = opers[i].createOperationInfo();
/*
// Add operations for attribute getters and setters as needed
ArrayList list = new ArrayList();
for (int i = 0; i < operations.length; i++)
list.add(operations[i]);
for (int i = 0; i < attributes.length; i++) {
Descriptor descriptor = attributes[i].getDescriptor();
String getMethod = (String) descriptor.getFieldValue("getMethod");
if (getMethod != null) {
OperationInfo oper =
new OperationInfo(getMethod, true,
attributes[i].getType());
list.add(oper.createOperationInfo());
}
String setMethod = (String) descriptor.getFieldValue("setMethod");
if (setMethod != null) {
OperationInfo oper =
new OperationInfo(setMethod, false,
attributes[i].getType());
list.add(oper.createOperationInfo());
}
}
if (list.size() > operations.length)
operations =
(ModelMBeanOperationInfo[]) list.toArray(operations);
*/
// Construct and return a new ModelMBeanInfo object
info = new ModelMBeanInfoSupport
(getClassName(), getDescription(),
attributes, constructors, operations, notifications);
try {
Descriptor descriptor = info.getMBeanDescriptor();
Iterator fields = getFields().iterator();
while (fields.hasNext()) {
FieldInfo field = (FieldInfo) fields.next();
descriptor.setField(field.getName(), field.getValue());
}
info.setMBeanDescriptor(descriptor);
} catch (MBeanException e) {
;
}
return (info);
}
/**
* Return a string representation of this managed bean.
*/
public String toString() {
StringBuffer sb = new StringBuffer("ManagedBean[");
sb.append("name=");
sb.append(name);
sb.append(", className=");
sb.append(className);
sb.append(", description=");
sb.append(description);
if (group != null) {
sb.append(", group=");
sb.append(group);
}
sb.append(", type=");
sb.append(type);
sb.append("]");
return (sb.toString());
}
}
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