public class

StandardMBean

extends Object
implements DynamicMBean MBeanRegistration
java.lang.Object
   ↳ javax.management.StandardMBean
Known Direct Subclasses

Class Overview

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, false);
     mbs.registerMBean(mbean, objectName);
  • Subclassing StandardMBean: 
         public class Impl extends StandardMBean implements Intf {
        public Impl() {
          super(Intf.class, false);
       }
       // 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.

This class may also be used to construct MXBeans. The usage is exactly the same as for Standard MBeans except that in the examples above, the false parameter to the constructor or super(...) invocation is instead true.

Summary

Public Constructors
<T> StandardMBean(T implementation, Class<T> mbeanInterface)

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

<T> StandardMBean(T implementation, Class<T> mbeanInterface, boolean isMXBean)

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

Protected Constructors
StandardMBean(Class<?> mbeanInterface)

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

StandardMBean(Class<?> mbeanInterface, boolean isMXBean)

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

Public Methods
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.
Object getImplementation()
Get the implementation of this Standard MBean (or MXBean).
Class<?> getImplementationClass()
Get the class of the implementation of this Standard MBean (or MXBean).
MBeanInfo getMBeanInfo()
Get the MBeanInfo for this MBean.
final Class<?> getMBeanInterface()
Get the Management Interface of this Standard MBean (or MXBean).
Object invoke(String actionName, Object[] params, String[] signature)
Allows an action to be invoked on the Dynamic MBean.
void postDeregister()

Allows the MBean to perform any operations needed after having been unregistered in the MBean server.

void postRegister(Boolean registrationDone)

Allows the MBean to perform any operations needed after having been registered in the MBean server or after the registration has failed.

void preDeregister()

Allows the MBean to perform any operations it needs before being unregistered by the MBean server.

ObjectName preRegister(MBeanServer server, ObjectName name)

Allows the MBean to perform any operations it needs before being registered in the MBean server.

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.

Protected Methods
void cacheMBeanInfo(MBeanInfo info)
Customization hook: cache the MBeanInfo built for this object.
MBeanInfo getCachedMBeanInfo()
Customization hook: Return the MBeanInfo cached for this object.
String getClassName(MBeanInfo info)
Customization hook: Get the className that will be used in the MBeanInfo returned by this MBean.
MBeanConstructorInfo[] getConstructors(MBeanConstructorInfo[] ctors, Object impl)
Customization hook: Get the MBeanConstructorInfo[] that will be used in the MBeanInfo returned by this MBean.
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.
String getDescription(MBeanOperationInfo info)
Customization hook: Get the description that will be used in the MBeanOperationInfo returned by this MBean.
String getDescription(MBeanAttributeInfo info)
Customization hook: Get the description that will be used in the MBeanAttributeInfo returned by this MBean.
String getDescription(MBeanFeatureInfo info)

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

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.
String getDescription(MBeanInfo info)
Customization hook: Get the description that will be used in the MBeanInfo returned by this MBean.
String getDescription(MBeanConstructorInfo info)
Customization hook: Get the description that will be used in the MBeanConstructorInfo returned by this MBean.
int getImpact(MBeanOperationInfo info)
Customization hook: Get the impact flag of the operation that will be used in the MBeanOperationInfo returned by this MBean.
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.
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.
[Expand]
Inherited Methods
From class java.lang.Object
From interface javax.management.DynamicMBean
From interface javax.management.MBeanRegistration

Public Constructors

public StandardMBean (T implementation, Class<T> mbeanInterface)

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.

public StandardMBean (T implementation, Class<T> mbeanInterface, boolean isMXBean)

Make a DynamicMBean out of the object implementation, using the specified mbeanInterface class. This constructor can be used to make either Standard MBeans or MXBeans. Unlike the constructor StandardMBean(Object, Class), it does not throw NotCompliantMBeanException.

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.
isMXBean If true, the mbeanInterface parameter names an MXBean interface and the resultant MBean is an MXBean.
Throws
IllegalArgumentException if the given implementation is null, or if the mbeanInterface does not follow JMX design patterns for Management Interfaces, or if the given implementation does not implement the specified interface.

Protected Constructors

protected StandardMBean (Class<?> mbeanInterface)

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.

protected StandardMBean (Class<?> mbeanInterface, boolean isMXBean)

Make a DynamicMBean out of this, using the specified mbeanInterface class. This constructor can be used to make either Standard MBeans or MXBeans. Unlike the constructor StandardMBean(Object, Class), it does not throw NotCompliantMBeanException.

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

Parameters
mbeanInterface The Management Interface exported by this MBean.
isMXBean If true, the mbeanInterface parameter names an MXBean interface and the resultant MBean is an MXBean.
Throws
IllegalArgumentException if the mbeanInterface does not follow JMX design patterns for Management Interfaces, or if this does not implement the specified interface.

Public Methods

public Object getAttribute (String attribute)

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

Parameters
attribute The name of the attribute to be retrieved
Returns
  • The value of the attribute retrieved.
Throws
AttributeNotFoundException
MBeanException
ReflectionException

public AttributeList getAttributes (String[] attributes)

Get the values of several attributes of the Dynamic MBean.

Parameters
attributes A list of the attributes to be retrieved.
Returns
  • The list of attributes retrieved.

public Object getImplementation ()

Get the implementation of this Standard MBean (or MXBean).

Returns
  • The implementation of this Standard MBean (or MXBean).
See Also

public Class<?> getImplementationClass ()

Get the class of the implementation of this Standard MBean (or MXBean).

Returns
  • The class of the implementation of this Standard MBean (or MXBean).

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.

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

public final Class<?> getMBeanInterface ()

Get the Management Interface of this Standard MBean (or MXBean).

Returns
  • The management interface of this Standard MBean (or MXBean).

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

Allows an action to be invoked on the Dynamic MBean.

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
ReflectionException

public void postDeregister ()

Allows the MBean to perform any operations needed after having been unregistered in the MBean server.

The default implementation of this method does nothing for Standard MBeans. For MXBeans, it removes any information that was recorded by the preRegister method.

It is good practice for a subclass that overrides this method to call the overridden method via super.postRegister(...). This is necessary if this object is an MXBean that is referenced by attributes or operations in other MXBeans.

public void postRegister (Boolean registrationDone)

Allows the MBean to perform any operations needed after having been registered in the MBean server or after the registration has failed.

The default implementation of this method does nothing for Standard MBeans. For MXBeans, it undoes any work done by preRegister if registration fails.

It is good practice for a subclass that overrides this method to call the overridden method via super.postRegister(...). This is necessary if this object is an MXBean that is referenced by attributes or operations in other MXBeans.

Parameters
registrationDone Indicates whether or not the MBean has been successfully registered in the MBean server. The value false means that the registration phase has failed.

public void preDeregister ()

Allows the MBean to perform any operations it needs before being unregistered by the MBean server.

The default implementation of this method does nothing.

It is good practice for a subclass that overrides this method to call the overridden method via super.preDeegister(...).

Throws
Exception no checked exceptions are throw by this method but Exception is declared so that subclasses can override this method and throw their own exceptions.

public ObjectName preRegister (MBeanServer server, ObjectName name)

Allows the MBean to perform any operations it needs before being registered in the MBean server. If the name of the MBean is not specified, the MBean can provide a name for its registration. If any exception is raised, the MBean will not be registered in the MBean server.

The default implementation of this method returns the name parameter. It does nothing else for Standard MBeans. For MXBeans, it records the MBeanServer and ObjectName parameters so they can be used to translate inter-MXBean references.

It is good practice for a subclass that overrides this method to call the overridden method via super.preRegister(...). This is necessary if this object is an MXBean that is referenced by attributes or operations in other MXBeans.

Parameters
server The MBean server in which the MBean will be registered.
name The object name of the MBean. This name is null if the name parameter to one of the createMBean or registerMBean methods in the MBeanServer interface is null. In that case, this method must return a non-null ObjectName for the new MBean.
Returns
  • The name under which the MBean is to be registered. This value must not be null. If the name parameter is not null, it will usually but not necessarily be the returned value.
Throws
IllegalArgumentException if this is an MXBean and name is null.
InstanceAlreadyExistsException if this is an MXBean and it has already been registered under another name (in this MBean Server or another).
Exception no other checked exceptions are thrown by this method but Exception is declared so that subclasses can override the method and throw their own exceptions.

public void setAttribute (Attribute attribute)

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

Parameters
attribute The identification of the attribute to be set and the value it is to be set to.
Throws
AttributeNotFoundException
InvalidAttributeValueException
MBeanException
ReflectionException

public AttributeList setAttributes (AttributeList attributes)

Sets the values of several attributes of the Dynamic MBean.

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.

public void setImplementation (Object implementation)

Replace the implementation object wrapped in this object.

Parameters
implementation The new implementation of this Standard MBean (or MXBean). The implementation object must implement the Standard MBean (or MXBean) 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 Standard MBean (or MXBean) interface that was supplied at construction.
See Also

Protected Methods

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.

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

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.

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 behavior, 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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.