org.apache.commons.modeler
Class BaseModelMBean

java.lang.Object
  |
  +--org.apache.commons.modeler.BaseModelMBean

All Implemented Interfaces:

javax.management.DynamicMBean, javax.management.modelmbean.ModelMBean, javax.management.modelmbean.ModelMBeanNotificationBroadcaster, javax.management.NotificationBroadcaster, javax.management.PersistentMBean

public class BaseModelMBean

extends java.lang.Object

implements javax.management.modelmbean.ModelMBean

Basic implementation of the ModelMBean interface, which supports the minimal requirements of the interface contract as follows:

• Only managed resources of type objectReference are supportd.
• Caching of attribute values and operation results is not supported. All calls to invoke() are immediately executed.
• Logging (under control of descriptors) is not supported.
• Persistence of MBean attributes and operations is not supported.
• All classes referenced as attribute types, operation parameters, or operation return values must be one of the following:
  • One of the Java primitive types (boolean, byte, char, double, float, integer, long, short). Corresponding value will be wrapped in the appropriate wrapper class automatically.
  • Operations that return no value should declare a return type of void.

Version:

$Revision: 1.1.1.1 $ $Date: 2002/04/30 20:58:51 $

Author:

Craig R. McClanahan

Field Summary

protected BaseNotificationBroadcaster	attributeBroadcaster Notification broadcaster for attribute changes.
protected BaseNotificationBroadcaster	generalBroadcaster Notification broadcaster for general notifications.
protected javax.management.modelmbean.ModelMBeanInfo	info The ModelMBeanInfo object that controls our activity.
protected java.lang.Object	resource The managed resource this MBean is associated with (if any).

Constructor Summary

BaseModelMBean()
Construct a ModelMBean with default ModelMBeanInfo information.

BaseModelMBean(javax.management.modelmbean.ModelMBeanInfo info)
Construct a ModelMBean associated with the specified ModelMBeanInfo information.

Method Summary

void	addAttributeChangeNotificationListener(javax.management.NotificationListener listener, java.lang.String name, java.lang.Object handback) Add an attribute change notification event listener to this MBean.
void	addNotificationListener(javax.management.NotificationListener listener, javax.management.NotificationFilter filter, java.lang.Object handback) Add a notification event listener to this MBean.
protected javax.management.modelmbean.ModelMBeanInfo	createDefaultModelMBeanInfo() Create and return a default ModelMBeanInfo object.
java.lang.Object	getAttribute(java.lang.String name) Obtain and return the value of a specific attribute of this MBean.
javax.management.AttributeList	getAttributes(java.lang.String[] names) Obtain and return the values of several attributes of this MBean.
java.lang.Object	getManagedResource() Get the instance handle of the object against which we execute all methods in this ModelMBean management interface.
javax.management.MBeanInfo	getMBeanInfo() Return the MBeanInfo object for this MBean.
javax.management.MBeanNotificationInfo[]	getNotificationInfo() Return an MBeanNotificationInfo object describing the notifications sent by this MBean.
java.lang.Object	invoke(java.lang.String name, java.lang.Object[] params, java.lang.String[] signature) Invoke a particular method on this MBean, and return any returned value.
protected boolean	isModelMBeanInfoValid(javax.management.modelmbean.ModelMBeanInfo info) Is the specified ModelMBeanInfo instance valid?
void	load() Instantiates this MBean instance from data found in the persistent store.
void	removeAttributeChangeNotificationListener(javax.management.NotificationListener listener, java.lang.String name) Remove an attribute change notification event listener from this MBean.
void	removeAttributeChangeNotificationListener(javax.management.NotificationListener listener, java.lang.String attributeName, java.lang.Object handback) Remove an attribute change notification event listener from this MBean.
void	removeNotificationListener(javax.management.NotificationListener listener) Remove a notification event listener from this MBean.
void	removeNotificationListener(javax.management.NotificationListener listener, javax.management.NotificationFilter filter, java.lang.Object handback) Remove a notification event listener from this MBean.
void	removeNotificationListener(javax.management.NotificationListener listener, java.lang.Object handback) Remove a notification event listener from this MBean.
void	sendAttributeChangeNotification(javax.management.Attribute oldValue, javax.management.Attribute newValue) Send an AttributeChangeNotification to all registered listeners.
void	sendAttributeChangeNotification(javax.management.AttributeChangeNotification notification) Send an AttributeChangeNotification to all registered listeners.
void	sendNotification(javax.management.Notification notification) Send a Notification to all registered listeners as a jmx.modelmbean.general notification.
void	sendNotification(java.lang.String message) Send a Notification which contains the specified string as a jmx.modelmbean.generic notification.
void	setAttribute(javax.management.Attribute attribute) Set the value of a specific attribute of this MBean.
javax.management.AttributeList	setAttributes(javax.management.AttributeList attributes) Set the values of several attributes of this MBean.
void	setManagedResource(java.lang.Object resource, java.lang.String type) Set the instance handle of the object against which we will execute all methods in this ModelMBean management interface.
void	setModelMBeanInfo(javax.management.modelmbean.ModelMBeanInfo info) Initialize the ModelMBeanInfo associated with this ModelMBean.
void	store() Capture the current state of this MBean instance and write it out to the persistent store.

Methods inherited from class java.lang.Object

, clone, equals, finalize, getClass, hashCode, notify, notifyAll, registerNatives, toString, wait, wait, wait

Field Detail

attributeBroadcaster

protected BaseNotificationBroadcaster attributeBroadcaster

Notification broadcaster for attribute changes.

generalBroadcaster

protected BaseNotificationBroadcaster generalBroadcaster

Notification broadcaster for general notifications.

info

protected javax.management.modelmbean.ModelMBeanInfo info

The ModelMBeanInfo object that controls our activity.

resource

protected java.lang.Object resource

The managed resource this MBean is associated with (if any).

Constructor Detail

BaseModelMBean

public BaseModelMBean()
               throws javax.management.MBeanException,
                      javax.management.RuntimeOperationsException

Construct a ModelMBean with default ModelMBeanInfo information.

Throws:

javax.management.MBeanException - if the initializer of an object throws an exception

javax.management.RuntimeOperationsException - if an IllegalArgumentException occurs

BaseModelMBean

public BaseModelMBean(javax.management.modelmbean.ModelMBeanInfo info)
               throws javax.management.MBeanException,
                      javax.management.RuntimeOperationsException

Construct a ModelMBean associated with the specified ModelMBeanInfo information.

Parameters:

info - ModelMBeanInfo for this MBean

Throws:

javax.management.MBeanException - if the initializer of an object throws an exception

javax.management.RuntimeOperationsException - if an IllegalArgumentException occurs

Method Detail

getAttribute

public java.lang.Object getAttribute(java.lang.String name)
                              throws javax.management.AttributeNotFoundException,
                                     javax.management.MBeanException,
                                     javax.management.ReflectionException

Obtain and return the value of a specific attribute of this MBean.

Specified by:

getAttribute in interface javax.management.DynamicMBean

Parameters:

name - Name of the requested attribute

Throws:

javax.management.AttributeNotFoundException - if this attribute is not supported by this MBean

javax.management.MBeanException - if the initializer of an object throws an exception

javax.management.ReflectionException - if a Java reflection exception occurs when invoking the getter

getAttributes

public javax.management.AttributeList getAttributes(java.lang.String[] names)

Obtain and return the values of several attributes of this MBean.

Specified by:

getAttributes in interface javax.management.DynamicMBean

Parameters:

names - Names of the requested attributes

getMBeanInfo

public javax.management.MBeanInfo getMBeanInfo()

Return the MBeanInfo object for this MBean.

Specified by:

getMBeanInfo in interface javax.management.DynamicMBean

invoke

public java.lang.Object invoke(java.lang.String name,
                               java.lang.Object[] params,
                               java.lang.String[] signature)
                        throws javax.management.MBeanException,
                               javax.management.ReflectionException

Invoke a particular method on this MBean, and return any returned value.

IMPLEMENTATION NOTE - This implementation will attempt to invoke this method on the MBean itself, or (if not available) on the managed resource object associated with this MBean.

Specified by:

invoke in interface javax.management.DynamicMBean

Parameters:

name - Name of the operation to be invoked

params - Array containing the method parameters of this operation

signature - Array containing the class names representing the signature of this operation

Throws:

javax.management.MBeanException - if the initializer of an object throws an exception

ReflectioNException - if a Java reflection exception occurs when invoking a method

setAttribute

public void setAttribute(javax.management.Attribute attribute)
                  throws javax.management.AttributeNotFoundException,
                         javax.management.MBeanException,
                         javax.management.ReflectionException

Set the value of a specific attribute of this MBean.

Specified by:

setAttribute in interface javax.management.DynamicMBean

Parameters:

attribute - The identification of the attribute to be set and the new value

Throws:

javax.management.AttributeNotFoundException - if this attribute is not supported by this MBean

javax.management.MBeanException - if the initializer of an object throws an exception

javax.management.ReflectionException - if a Java reflection exception occurs when invoking the getter

setAttributes

public javax.management.AttributeList setAttributes(javax.management.AttributeList attributes)

Set the values of several attributes of this MBean.

Specified by:

setAttributes in interface javax.management.DynamicMBean

Parameters:

attributes - THe names and values to be set

Returns:

The list of attributes that were set and their new values

getManagedResource

public java.lang.Object getManagedResource()
                                    throws javax.management.InstanceNotFoundException,
                                           javax.management.modelmbean.InvalidTargetObjectTypeException,
                                           javax.management.MBeanException,
                                           javax.management.RuntimeOperationsException

Get the instance handle of the object against which we execute all methods in this ModelMBean management interface.

Throws:

javax.management.InstanceNotFoundException - if the managed resource object cannot be found

javax.management.MBeanException - if the initializer of the object throws an exception

javax.management.RuntimeOperationsException - if the managed resource or the resource type is null or invalid

setManagedResource

public void setManagedResource(java.lang.Object resource,
                               java.lang.String type)
                        throws javax.management.InstanceNotFoundException,
                               javax.management.modelmbean.InvalidTargetObjectTypeException,
                               javax.management.MBeanException,
                               javax.management.RuntimeOperationsException

Set the instance handle of the object against which we will execute all methods in this ModelMBean management interface.

Specified by:

setManagedResource in interface javax.management.modelmbean.ModelMBean

Parameters:

resource - The resource object to be managed

type - The type of reference for the managed resource ("ObjectReference", "Handle", "IOR", "EJBHandle", or "RMIReference")

Throws:

javax.management.InstanceNotFoundException - if the managed resource object cannot be found

javax.management.modelmbean.InvalidTargetObjectTypeException - if this ModelMBean is asked to handle a reference type it cannot deal with

javax.management.MBeanException - if the initializer of the object throws an exception

javax.management.RuntimeOperationsException - if the managed resource or the resource type is null or invalid

setModelMBeanInfo

public void setModelMBeanInfo(javax.management.modelmbean.ModelMBeanInfo info)
                       throws javax.management.MBeanException,
                              javax.management.RuntimeOperationsException

Initialize the ModelMBeanInfo associated with this ModelMBean. After the information and associated descriptors have been customized, the ModelMBean should be registered with the associated MBeanServer.

Specified by:

setModelMBeanInfo in interface javax.management.modelmbean.ModelMBean

Parameters:

info - The ModelMBeanInfo object to be used by this ModelMBean

Throws:

javax.management.MBeanException - If an exception occurs recording this ModelMBeanInfo information

RuntimeOperations - if the specified parameter is null or invalid

addAttributeChangeNotificationListener

public void addAttributeChangeNotificationListener(javax.management.NotificationListener listener,
                                                   java.lang.String name,
                                                   java.lang.Object handback)
                                            throws java.lang.IllegalArgumentException

Add an attribute change notification event listener to this MBean.

Specified by:

addAttributeChangeNotificationListener in interface javax.management.modelmbean.ModelMBeanNotificationBroadcaster

Parameters:

listener - Listener that will receive event notifications

name - Name of the attribute of interest, or null to indicate interest in all attributes

handback - Handback object to be sent along with event notifications

Throws:

java.lang.IllegalArgumentException - if the listener parameter is null

removeAttributeChangeNotificationListener

public void removeAttributeChangeNotificationListener(javax.management.NotificationListener listener,
                                                      java.lang.String name)
                                               throws javax.management.ListenerNotFoundException

Remove an attribute change notification event listener from this MBean.

Specified by:

removeAttributeChangeNotificationListener in interface javax.management.modelmbean.ModelMBeanNotificationBroadcaster

Parameters:

listener - The listener to be removed

name - The attribute name for which no more events are required

Throws:

javax.management.ListenerNotFoundException - if this listener is not registered in the MBean

removeAttributeChangeNotificationListener

public void removeAttributeChangeNotificationListener(javax.management.NotificationListener listener,
                                                      java.lang.String attributeName,
                                                      java.lang.Object handback)
                                               throws javax.management.ListenerNotFoundException

Remove an attribute change notification event listener from this MBean.

Specified by:

removeAttributeChangeNotificationListener in interface javax.management.modelmbean.ModelMBeanNotificationBroadcaster

Parameters:

listener - The listener to be removed

name - The attribute name for which no more events are required

handback - Handback object to be sent along with event notifications

Throws:

javax.management.ListenerNotFoundException - if this listener is not registered in the MBean

sendAttributeChangeNotification

public void sendAttributeChangeNotification(javax.management.AttributeChangeNotification notification)
                                     throws javax.management.MBeanException,
                                            javax.management.RuntimeOperationsException

Send an AttributeChangeNotification to all registered listeners.

Specified by:

sendAttributeChangeNotification in interface javax.management.modelmbean.ModelMBeanNotificationBroadcaster

Parameters:

notification - The AttributeChangeNotification that will be passed

Throws:

javax.management.MBeanException - if an object initializer throws an exception

javax.management.RuntimeOperationsException - wraps IllegalArgumentException when the specified notification is null or invalid

sendAttributeChangeNotification

public void sendAttributeChangeNotification(javax.management.Attribute oldValue,
                                            javax.management.Attribute newValue)
                                     throws javax.management.MBeanException,
                                            javax.management.RuntimeOperationsException

Send an AttributeChangeNotification to all registered listeners.

Specified by:

sendAttributeChangeNotification in interface javax.management.modelmbean.ModelMBeanNotificationBroadcaster

Parameters:

oldValue - The original value of the Attribute

newValue - The new value of the Attribute

Throws:

javax.management.MBeanException - if an object initializer throws an exception

javax.management.RuntimeOperationsException - wraps IllegalArgumentException when the specified notification is null or invalid

sendNotification

public void sendNotification(javax.management.Notification notification)
                      throws javax.management.MBeanException,
                             javax.management.RuntimeOperationsException

Send a Notification to all registered listeners as a jmx.modelmbean.general notification.

Specified by:

sendNotification in interface javax.management.modelmbean.ModelMBeanNotificationBroadcaster

Parameters:

notification - The Notification that will be passed

Throws:

javax.management.MBeanException - if an object initializer throws an exception

javax.management.RuntimeOperationsException - wraps IllegalArgumentException when the specified notification is null or invalid

sendNotification

public void sendNotification(java.lang.String message)
                      throws javax.management.MBeanException,
                             javax.management.RuntimeOperationsException

Send a Notification which contains the specified string as a jmx.modelmbean.generic notification.

Specified by:

sendNotification in interface javax.management.modelmbean.ModelMBeanNotificationBroadcaster

Parameters:

message - The message string to be passed

Throws:

javax.management.MBeanException - if an object initializer throws an exception

javax.management.RuntimeOperationsException - wraps IllegalArgumentException when the specified notification is null or invalid

addNotificationListener

public void addNotificationListener(javax.management.NotificationListener listener,
                                    javax.management.NotificationFilter filter,
                                    java.lang.Object handback)
                             throws java.lang.IllegalArgumentException

Add a notification event listener to this MBean.

Specified by:

addNotificationListener in interface javax.management.NotificationBroadcaster

Parameters:

listener - Listener that will receive event notifications

filter - Filter object used to filter event notifications actually delivered, or null for no filtering

handback - Handback object to be sent along with event notifications

Throws:

java.lang.IllegalArgumentException - if the listener parameter is null

getNotificationInfo

public javax.management.MBeanNotificationInfo[] getNotificationInfo()

Return an MBeanNotificationInfo object describing the notifications sent by this MBean.

Specified by:

getNotificationInfo in interface javax.management.NotificationBroadcaster

removeNotificationListener

public void removeNotificationListener(javax.management.NotificationListener listener)
                                throws javax.management.ListenerNotFoundException

Remove a notification event listener from this MBean.

Specified by:

removeNotificationListener in interface javax.management.NotificationBroadcaster

Parameters:

listener - The listener to be removed (any and all registrations for this listener will be eliminated)

Throws:

javax.management.ListenerNotFoundException - if this listener is not registered in the MBean

removeNotificationListener

public void removeNotificationListener(javax.management.NotificationListener listener,
                                       java.lang.Object handback)
                                throws javax.management.ListenerNotFoundException

Remove a notification event listener from this MBean.

Specified by:

removeNotificationListener in interface javax.management.NotificationBroadcaster

Parameters:

listener - The listener to be removed (any and all registrations for this listener will be eliminated)

handback - Handback object to be sent along with event notifications

Throws:

javax.management.ListenerNotFoundException - if this listener is not registered in the MBean

removeNotificationListener

public void removeNotificationListener(javax.management.NotificationListener listener,
                                       javax.management.NotificationFilter filter,
                                       java.lang.Object handback)
                                throws javax.management.ListenerNotFoundException

Remove a notification event listener from this MBean.

Specified by:

removeNotificationListener in interface javax.management.NotificationBroadcaster

Parameters:

listener - The listener to be removed (any and all registrations for this listener will be eliminated)

filter - Filter object used to filter event notifications actually delivered, or null for no filtering

handback - Handback object to be sent along with event notifications

Throws:

javax.management.ListenerNotFoundException - if this listener is not registered in the MBean

load

public void load()
          throws javax.management.InstanceNotFoundException,
                 javax.management.MBeanException,
                 javax.management.RuntimeOperationsException

Instantiates this MBean instance from data found in the persistent store. The data loaded could include attribute and operation values. This method should be called during construction or initialization of the instance, and before the MBean is registered with the MBeanServer.

IMPLEMENTATION NOTE - This implementation does not support persistence.

Specified by:

load in interface javax.management.PersistentMBean

Throws:

javax.management.InstanceNotFoundException - if the managed resource object cannot be found

javax.management.MBeanException - if the initializer of the object throws an exception

javax.management.RuntimeOperationsException - if an exception is reported by the persistence mechanism

store

public void store()
           throws javax.management.InstanceNotFoundException,
                  javax.management.MBeanException,
                  javax.management.RuntimeOperationsException

Capture the current state of this MBean instance and write it out to the persistent store. The state stored could include attribute and operation values. If one of these methods of persistence is not supported, a "service not found" exception will be thrown.

IMPLEMENTATION NOTE - This implementation does not support persistence.

Specified by:

store in interface javax.management.PersistentMBean

Throws:

javax.management.InstanceNotFoundException - if the managed resource object cannot be found

javax.management.MBeanException - if the initializer of the object throws an exception, or persistence is not supported

javax.management.RuntimeOperationsException - if an exception is reported by the persistence mechanism

createDefaultModelMBeanInfo

protected javax.management.modelmbean.ModelMBeanInfo createDefaultModelMBeanInfo()

Create and return a default ModelMBeanInfo object.

isModelMBeanInfoValid

protected boolean isModelMBeanInfoValid(javax.management.modelmbean.ModelMBeanInfo info)

Is the specified ModelMBeanInfo instance valid?

IMPLEMENTATION NOTE - This implementation does not check anything, but this method can be overridden as required.

Parameters:

info - The ModelMBeanInfo object to check