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JavaTM 2 Platform Std. Ed. v1.5.0

javax.management
Class StandardMBean

java.lang.Object
  javax.management.StandardMBean

All Implemented Interfaces:: DynamicMBean

public class StandardMBean
extends Object
implements DynamicMBean
extends Object
implements DynamicMBean

An MBean whose management interface is determined by reflection on a Java interface.

This class brings more flexibility to the notion of Management Interface in the use of Standard MBeans. Straightforward use of the patterns for Standard MBeans described in the JMX Specification means that there is a fixed relationship between the implementation class of an MBean and its management interface (i.e., if the implementation class is Thing, the management interface must be ThingMBean). This class makes it possible to keep the convenience of specifying the management interface with a Java interface, without requiring that there be any naming relationship between the implementation and interface classes.

By making a DynamicMBean out of an MBean, this class makes it possible to select any interface implemented by the MBean as its management interface, provided that it complies with JMX patterns (i.e., attributes defined by getter/setter etc...).

This class also provides hooks that make it possible to supply custom descriptions and names for the MBeanInfo returned by the DynamicMBean interface.

Using this class, an MBean can be created with any implementation class name Impl and with a management interface defined (as for current Standard MBeans) by any interface Intf, in one of two general ways:

Using the public constructor StandardMBean(impl,interface):

     MBeanServer mbs;
     ...
     Impl impl = new Impl(...);
     StandardMBean mbean = new StandardMBean(impl, Intf.class);
     mbs.registerMBean(mbean, objectName);

Subclassing StandardMBean:

     public class Impl extends StandardMBean implements Intf {
        public Impl() {
          super(Intf.class);
       }
       // implement methods of Intf
     }

     [...]

     MBeanServer mbs;
     ....
     Impl impl = new Impl();
     mbs.registerMBean(impl, objectName);

In either case, the class Impl must implement the interface Intf.

Standard MBeans based on the naming relationship between implementation and interface classes are of course still available.

Since:: 1.5

Constructor Summary

protected StandardMBean(Class mbeanInterface)
          Make a DynamicMBean out of this, using the specified mbeanInterface class.

StandardMBean(Object implementation, Class mbeanInterface)
          Make a DynamicMBean out of the object implementation, using the specified mbeanInterface class.

Method Summary

protected void cacheMBeanInfo(MBeanInfo info)
          Customization hook: cache the MBeanInfo built for this object.

Object getAttribute(String attribute)
          Obtain the value of a specific attribute of the Dynamic MBean.

AttributeList getAttributes(String[] attributes)
          Get the values of several attributes of the Dynamic MBean.

protected MBeanInfo getCachedMBeanInfo()
          Customization hook: Return the MBeanInfo cached for this object.

protected String getClassName(MBeanInfo info)
          Customization hook: Get the className that will be used in the MBeanInfo returned by this MBean.

protected MBeanConstructorInfo[] getConstructors(MBeanConstructorInfo[] ctors, Object impl)
          Customization hook: Get the MBeanConstructorInfo[] that will be used in the MBeanInfo returned by this MBean.

protected String getDescription(MBeanAttributeInfo info)
          Customization hook: Get the description that will be used in the MBeanAttributeInfo returned by this MBean.

protected String getDescription(MBeanConstructorInfo info)
          Customization hook: Get the description that will be used in the MBeanConstructorInfo returned by this MBean.

protected String getDescription(MBeanConstructorInfo ctor, MBeanParameterInfo param, int sequence)
          Customization hook: Get the description that will be used for the sequence MBeanParameterInfo of the MBeanConstructorInfo returned by this MBean.

protected String getDescription(MBeanFeatureInfo info)
          Customization hook: Get the description that will be used in the MBeanFeatureInfo returned by this MBean.

protected String getDescription(MBeanInfo info)
          Customization hook: Get the description that will be used in the MBeanInfo returned by this MBean.

protected String getDescription(MBeanOperationInfo info)
          Customization hook: Get the description that will be used in the MBeanOperationInfo returned by this MBean.

protected String getDescription(MBeanOperationInfo op, MBeanParameterInfo param, int sequence)
          Customization hook: Get the description that will be used for the sequence MBeanParameterInfo of the MBeanOperationInfo returned by this MBean.

protected int getImpact(MBeanOperationInfo info)
          Customization hook: Get the impact flag of the operation that will be used in the MBeanOperationInfo returned by this MBean.

Object getImplementation()
          Get the implementation of this MBean.

Class getImplementationClass()
          Get the class of the implementation of this MBean.

MBeanInfo getMBeanInfo()
          Get the MBeanInfo for this MBean.

Class getMBeanInterface()
          Get the Management Interface of this MBean.

protected String getParameterName(MBeanConstructorInfo ctor, MBeanParameterInfo param, int sequence)
          Customization hook: Get the name that will be used for the sequence MBeanParameterInfo of the MBeanConstructorInfo returned by this MBean.

protected String getParameterName(MBeanOperationInfo op, MBeanParameterInfo param, int sequence)
          Customization hook: Get the name that will be used for the sequence MBeanParameterInfo of the MBeanOperationInfo returned by this MBean.

Object invoke(String actionName, Object[] params, String[] signature)
          Allows an action to be invoked on the Dynamic MBean.

void setAttribute(Attribute attribute)
          Set the value of a specific attribute of the Dynamic MBean.

AttributeList setAttributes(AttributeList attributes)
          Sets the values of several attributes of the Dynamic MBean.

void setImplementation(Object implementation)
          Replace the implementation object wrapped in this object.

Methods inherited from class java.lang.Object

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

Constructor Detail

StandardMBean

public StandardMBean(Object implementation,
                     Class mbeanInterface)
              throws NotCompliantMBeanException

Make a DynamicMBean out of the object implementation, using the specified mbeanInterface class.

Parameters:: implementation - The implementation of this MBean.; mbeanInterface - The Management Interface exported by this MBean's implementation. If null, then this object will use standard JMX design pattern to determine the management interface associated with the given implementation.
Throws:: IllegalArgumentException - if the given implementation is null.; NotCompliantMBeanException - if the mbeanInterface does not follow JMX design patterns for Management Interfaces, or if the given implementation does not implement the specified interface.

StandardMBean

protected StandardMBean(Class mbeanInterface)
                 throws NotCompliantMBeanException

Make a DynamicMBean out of this, using the specified mbeanInterface class.

Call this(this,mbeanInterface). This constructor is reserved to subclasses.

Parameters:: mbeanInterface - The Management Interface exported by this MBean.
Throws:: NotCompliantMBeanException - if the mbeanInterface does not follow JMX design patterns for Management Interfaces, or if this does not implement the specified interface.

Method Detail

setImplementation

public void setImplementation(Object implementation)
                       throws NotCompliantMBeanException

Replace the implementation object wrapped in this object.

Parameters:: implementation - The new implementation of this MBean. The implementation object must implement the MBean interface that was supplied when this StandardMBean was constructed.
Throws:: IllegalArgumentException - if the given implementation is null.; NotCompliantMBeanException - if the given implementation does not implement the MBean interface that was supplied at construction.
See Also:: getImplementation()

getImplementation

public Object getImplementation()

Get the implementation of this MBean.

Returns:: The implementation of this MBean.
See Also:: setImplementation(java.lang.Object)

getMBeanInterface

public final Class getMBeanInterface()

Get the Management Interface of this MBean.

Returns:: The management interface of this MBean.

getImplementationClass

public Class getImplementationClass()

Get the class of the implementation of this MBean.

Returns:: The class of the implementation of this MBean.