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javax.management
Class StandardMBean

java.lang.Object
  javax.management.StandardMBean

All Implemented Interfaces:

DynamicMBean

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public class StandardMBean

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:

JMX 1.2

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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.

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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()

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getImplementation

public Object getImplementation()

Get the implementation of this MBean.

Returns:

The implementation of this MBean.

See Also:

setImplementation(java.lang.Object)

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getMBeanInterface

public final Class getMBeanInterface()

Get the Management Interface of this MBean.

Returns:

The management interface of this MBean.

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getImplementationClass

public Class getImplementationClass()

Get the class of the implementation of this MBean.

Returns:

The class of the implementation of this MBean.

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getAttribute

public Object getAttribute(String attribute)
                    throws AttributeNotFoundException,
                           MBeanException,
                           ReflectionException

Description copied from interface: DynamicMBean

Obtain the value of a specific attribute of the Dynamic MBean.

Specified by:

getAttribute in interface DynamicMBean

Parameters:

attribute - The name of the attribute to be retrieved

Returns:

The value of the attribute retrieved.

Throws:

ReflectionException - Wraps a java.lang.Exception thrown while trying to invoke the getter.

AttributeNotFoundException

MBeanException - Wraps a java.lang.Exception thrown by the MBean's getter.

See Also:

DynamicMBean.setAttribute(javax.management.Attribute)

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setAttribute

public void setAttribute(Attribute attribute)
                  throws AttributeNotFoundException,
                         InvalidAttributeValueException,
                         MBeanException,
                         ReflectionException

Description copied from interface: DynamicMBean

Set the value of a specific attribute of the Dynamic MBean.

Specified by:

setAttribute in interface DynamicMBean

Parameters:

attribute - The identification of the attribute to be set and the value it is to be set to.

Throws:

InvalidAttributeValueException

AttributeNotFoundException

MBeanException - Wraps a java.lang.Exception thrown by the MBean's setter.

ReflectionException - Wraps a java.lang.Exception thrown while trying to invoke the MBean's setter.

See Also:

DynamicMBean.getAttribute(java.lang.String)

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getAttributes

public AttributeList getAttributes(String[] attributes)

Description copied from interface: DynamicMBean

Get the values of several attributes of the Dynamic MBean.

Specified by:

getAttributes in interface DynamicMBean

Parameters:

attributes - A list of the attributes to be retrieved.

Returns:

The list of attributes retrieved.

See Also:

DynamicMBean.setAttributes(javax.management.AttributeList)

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setAttributes

public AttributeList setAttributes(AttributeList attributes)

Description copied from interface: DynamicMBean

Sets the values of several attributes of the Dynamic MBean.

Specified by:

setAttributes in interface DynamicMBean

Parameters:

attributes - A list of attributes: The identification of the attributes to be set and the values they are to be set to.

Returns:

The list of attributes that were set, with their new values.

See Also:

DynamicMBean.getAttributes(java.lang.String[])

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invoke

public Object invoke(String actionName,
                     Object[] params,
                     String[] signature)
              throws MBeanException,
                     ReflectionException

Description copied from interface: DynamicMBean

Allows an action to be invoked on the Dynamic MBean.

Specified by:

invoke in interface DynamicMBean

Parameters:

actionName - The name of the action to be invoked.

params - An array containing the parameters to be set when the action is invoked.

signature - An array containing the signature of the action. The class objects will be loaded through the same class loader as the one used for loading the MBean on which the action is invoked.

Returns:

The object returned by the action, which represents the result of invoking the action on the MBean specified.

Throws:

MBeanException - Wraps a java.lang.Exception thrown by the MBean's invoked method.

ReflectionException - Wraps a java.lang.Exception thrown while trying to invoke the method

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getMBeanInfo

public MBeanInfo getMBeanInfo()

Get the MBeanInfo for this MBean.

This method implements DynamicMBean.getMBeanInfo().

This method first calls getCachedMBeanInfo() in order to retrieve the cached MBeanInfo for this MBean, if any. If the MBeanInfo returned by getCachedMBeanInfo() is not null, then it is returned.
Otherwise, this method builds a default MBeanInfo for this MBean, using the Management Interface specified for this MBean.

While building the MBeanInfo, this method calls the customization hooks that make it possible for subclasses to supply their custom descriptions, parameter names, etc...
Finally, it calls cacheMBeanInfo() in order to cache the new MBeanInfo.

Specified by:

getMBeanInfo in interface DynamicMBean

Returns:

The cached MBeanInfo for that MBean, if not null, or a newly built MBeanInfo if none was cached.

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getClassName

protected String getClassName(MBeanInfo info)

Customization hook: Get the className that will be used in the MBeanInfo returned by this MBean.
Subclasses may redefine this method in order to supply their custom class name. The default implementation returns info.getClassName().

Parameters:

info - The default MBeanInfo derived by reflection.

Returns:

the class name for the new MBeanInfo.

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getDescription

protected String getDescription(MBeanInfo info)

Customization hook: Get the description that will be used in the MBeanInfo returned by this MBean.
Subclasses may redefine this method in order to supply their custom MBean description. The default implementation returns info.getDescription().

Parameters:

info - The default MBeanInfo derived by reflection.

Returns:

the description for the new MBeanInfo.

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getDescription

protected String getDescription(MBeanFeatureInfo info)

Customization hook: Get the description that will be used in the MBeanFeatureInfo returned by this MBean.

Subclasses may redefine this method in order to supply their custom description. The default implementation returns info.getDescription().

This method is called by getDescription(MBeanAttributeInfo), getDescription(MBeanOperationInfo), getDescription(MBeanConstructorInfo).

Parameters:

info - The default MBeanFeatureInfo derived by reflection.

Returns:

the description for the given MBeanFeatureInfo.

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getDescription

protected String getDescription(MBeanAttributeInfo info)

Customization hook: Get the description that will be used in the MBeanAttributeInfo returned by this MBean.

Subclasses may redefine this method in order to supply their custom description. The default implementation returns getDescription((MBeanFeatureInfo) info).

Parameters:

info - The default MBeanAttributeInfo derived by reflection.

Returns:

the description for the given MBeanAttributeInfo.

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getDescription

protected String getDescription(MBeanConstructorInfo info)

Customization hook: Get the description that will be used in the MBeanConstructorInfo returned by this MBean.
Subclasses may redefine this method in order to supply their custom description. The default implementation returns getDescription((MBeanFeatureInfo) info).

Parameters:

info - The default MBeanConstructorInfo derived by reflection.

Returns:

the description for the given MBeanConstructorInfo.

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getDescription

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.
Subclasses may redefine this method in order to supply their custom description. The default implementation returns param.getDescription().

Parameters:

ctor - The default MBeanConstructorInfo derived by reflection.

param - The default MBeanParameterInfo derived by reflection.

sequence - The sequence number of the parameter considered ("0" for the first parameter, "1" for the second parameter, etc...).

Returns:

the description for the given MBeanParameterInfo.

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getParameterName

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.
Subclasses may redefine this method in order to supply their custom parameter name. The default implementation returns param.getName().

Parameters:

ctor - The default MBeanConstructorInfo derived by reflection.

param - The default MBeanParameterInfo derived by reflection.

sequence - The sequence number of the parameter considered ("0" for the first parameter, "1" for the second parameter, etc...).

Returns:

the name for the given MBeanParameterInfo.

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getDescription

protected String getDescription(MBeanOperationInfo info)

Customization hook: Get the description that will be used in the MBeanOperationInfo returned by this MBean.
Subclasses may redefine this method in order to supply their custom description. The default implementation returns getDescription((MBeanFeatureInfo) info).

Parameters:

info - The default MBeanOperationInfo derived by reflection.

Returns:

the description for the given MBeanOperationInfo.

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getImpact

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.
Subclasses may redefine this method in order to supply their custom impact flag. The default implementation returns info.getImpact().

Parameters:

info - The default MBeanOperationInfo derived by reflection.

Returns:

the impact flag for the given MBeanOperationInfo.

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getParameterName

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.
Subclasses may redefine this method in order to supply their custom parameter name. The default implementation returns param.getName().

Parameters:

op - The default MBeanOperationInfo derived by reflection.

param - The default MBeanParameterInfo derived by reflection.

sequence - The sequence number of the parameter considered ("0" for the first parameter, "1" for the second parameter, etc...).

Returns:

the name to use for the given MBeanParameterInfo.

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getDescription

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.
Subclasses may redefine this method in order to supply their custom description. The default implementation returns param.getDescription().

Parameters:

op - The default MBeanOperationInfo derived by reflection.

param - The default MBeanParameterInfo derived by reflection.

sequence - The sequence number of the parameter considered ("0" for the first parameter, "1" for the second parameter, etc...).

Returns:

the description for the given MBeanParameterInfo.

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getConstructors

protected MBeanConstructorInfo[] getConstructors(MBeanConstructorInfo[] ctors,
                                                 Object impl)

Customization hook: Get the MBeanConstructorInfo[] that will be used in the MBeanInfo returned by this MBean.
By default, this method returns null if the wrapped implementation is not this. Indeed, if the wrapped implementation is not this object itself, it will not be possible to recreate a wrapped implementation by calling the implementation constructors through MBeanServer.createMBean(...).
Otherwise, if the wrapped implementation is this, ctors is returned.
Subclasses may redefine this method in order to modify this behaviour, if needed.

Parameters:

ctors - The default MBeanConstructorInfo[] derived by reflection.

impl - The wrapped implementation. If null is passed, the wrapped implementation is ignored and ctors is returned.

Returns:

the MBeanConstructorInfo[] for the new MBeanInfo.

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getCachedMBeanInfo

protected MBeanInfo getCachedMBeanInfo()

Customization hook: Return the MBeanInfo cached for this object.

Subclasses may redefine this method in order to implement their own caching policy. The default implementation stores one MBeanInfo object per instance.

Returns:

The cached MBeanInfo, or null if no MBeanInfo is cached.

See Also:

cacheMBeanInfo(MBeanInfo)

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cacheMBeanInfo

protected void cacheMBeanInfo(MBeanInfo info)

Customization hook: cache the MBeanInfo built for this object.

Subclasses may redefine this method in order to implement their own caching policy. The default implementation stores info in this instance. A subclass can define other policies, such as not saving info (so it is reconstructed every time getMBeanInfo() is called) or sharing a unique MBeanInfo object when several StandardMBean instances have equal MBeanInfo values.

Parameters:

info - the new MBeanInfo to cache. Any previously cached value is discarded. This parameter may be null, in which case there is no new cached value.

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