org.springframework.jmx.support
Class MBeanRegistrationSupport

java.lang.Object
  org.springframework.jmx.support.MBeanRegistrationSupport

Direct Known Subclasses:

ConnectorServerFactoryBean, MBeanExporter

public class MBeanRegistrationSupport
extends Object

Provides supporting infrastructure for registering MBeans with an MBeanServer. The behavior when encountering an existing MBean at a given ObjectName is fully configurable allowing for flexible registration settings.

All registered MBeans are tracked and can be unregistered by calling the #unregisterBeans() method.

Sub-classes can receive notifications when an MBean is registered or unregistered by overriding the onRegister(ObjectName) and onUnregister(ObjectName) methods respectively.

By default, the registration process will fail if attempting to register an MBean using a ObjectName that is already used.

By setting the registrationBehaviorName property to REGISTRATION_IGNORE_EXISTING the registration process will simply ignore existing MBeans leaving them registered. This is useful in settings where multiple applications want to share a common MBean in a shared MBeanServer.

Setting registrationBehaviorName property to REGISTRATION_REPLACE_EXISTING will cause existing MBeans to be replaced during registration if necessary. This is useful in situations where you can't guarantee the state of your MBeanServer.

Since:

2.0

Author:

Rob Harrop, Juergen Hoeller

See Also:

setServer(javax.management.MBeanServer), setRegistrationBehaviorName(java.lang.String), MBeanExporter

Field Summary

protected Log	logger Log instance for this class.
protected Set	registeredBeans The beans that have been registered by this exporter.
static int	REGISTRATION_FAIL_ON_EXISTING Constant indicating that registration should fail when attempting to register an MBean under a name that already exists.
static int	REGISTRATION_IGNORE_EXISTING Constant indicating that registration should ignore the affected MBean when attempting to register an MBean under a name that already exists.
static int	REGISTRATION_REPLACE_EXISTING Constant indicating that registration should replace the affected MBean when attempting to register an MBean under a name that already exists.
protected MBeanServer	server The MBeanServer instance being used to register beans.

Constructor Summary

MBeanRegistrationSupport()

Method Summary

protected void	doRegister(Object mbean, ObjectName objectName) Actually register the MBean with the server.
protected void	doUnregister(ObjectName objectName) Actually unregister the specified MBean from the server.
protected ObjectName[]	getRegisteredObjectNames() Return the ObjectNames of all registered beans.
MBeanServer	getServer() Return the MBeanServer that the beans will be registered with.
protected void	onRegister(ObjectName objectName) Called when an MBean is registered under the given ObjectName.
protected void	onRegister(ObjectName objectName, Object mbean) Called when an MBean is registered under the given ObjectName.
protected void	onUnregister(ObjectName objectName) Called when an MBean is unregistered under the given ObjectName.
void	setRegistrationBehavior(int registrationBehavior) Specify what action should be taken when attempting to register an MBean under an ObjectName that already exists.
void	setRegistrationBehaviorName(String registrationBehavior) Set the registration behavior by the name of the corresponding constant, e.g.
void	setServer(MBeanServer server) Specify the MBeanServer instance with which all beans should be registered.
protected void	unregisterBeans() Unregisters all beans that have been registered by an instance of this class.

Methods inherited from class java.lang.Object

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

Field Detail

REGISTRATION_FAIL_ON_EXISTING

public static final int REGISTRATION_FAIL_ON_EXISTING

Constant indicating that registration should fail when attempting to register an MBean under a name that already exists.

This is the default registration behavior.

See Also:

Constant Field Values

REGISTRATION_IGNORE_EXISTING

public static final int REGISTRATION_IGNORE_EXISTING

Constant indicating that registration should ignore the affected MBean when attempting to register an MBean under a name that already exists.

See Also:

Constant Field Values

REGISTRATION_REPLACE_EXISTING

public static final int REGISTRATION_REPLACE_EXISTING

Constant indicating that registration should replace the affected MBean when attempting to register an MBean under a name that already exists.

See Also:

Constant Field Values

logger

protected final Log logger

Log instance for this class.

server

protected MBeanServer server

The MBeanServer instance being used to register beans.

registeredBeans

protected final Set registeredBeans

The beans that have been registered by this exporter.

Constructor Detail

MBeanRegistrationSupport

public MBeanRegistrationSupport()

Method Detail

setServer

public void setServer(MBeanServer server)

Specify the MBeanServer instance with which all beans should be registered. The MBeanExporter will attempt to locate an existing MBeanServer if none is supplied.

getServer

public final MBeanServer getServer()

Return the MBeanServer that the beans will be registered with.

setRegistrationBehaviorName

public void setRegistrationBehaviorName(String registrationBehavior)

Set the registration behavior by the name of the corresponding constant, e.g. "REGISTRATION_IGNORE_EXISTING".

See Also:

setRegistrationBehavior(int), REGISTRATION_FAIL_ON_EXISTING, REGISTRATION_IGNORE_EXISTING, REGISTRATION_REPLACE_EXISTING

setRegistrationBehavior

public void setRegistrationBehavior(int registrationBehavior)

Specify what action should be taken when attempting to register an MBean under an ObjectName that already exists.

Default is REGISTRATION_FAIL_ON_EXISTING.

See Also:

setRegistrationBehaviorName(String), REGISTRATION_FAIL_ON_EXISTING, REGISTRATION_IGNORE_EXISTING, REGISTRATION_REPLACE_EXISTING

doRegister

protected void doRegister(Object mbean,
                          ObjectName objectName)
                   throws JMException

Actually register the MBean with the server. The behavior when encountering an existing MBean can be configured using the setRegistrationBehavior(int) and setRegistrationBehaviorName(String) methods.

Parameters:

mbean - the MBean instance

objectName - the suggested ObjectName for the MBean

Throws:

JMException - if the registration failed

unregisterBeans

protected void unregisterBeans()

Unregisters all beans that have been registered by an instance of this class.

doUnregister

protected void doUnregister(ObjectName objectName)

Actually unregister the specified MBean from the server.

Parameters:

objectName - the suggested ObjectName for the MBean

getRegisteredObjectNames

protected final ObjectName[] getRegisteredObjectNames()

Return the ObjectNames of all registered beans.

onRegister

protected void onRegister(ObjectName objectName,
                          Object mbean)

Called when an MBean is registered under the given ObjectName. Allows subclasses to perform additional processing when an MBean is registered.

The default implementation delegates to onRegister(ObjectName).

Parameters:

objectName - the actual ObjectName that the MBean was registered with

mbean - the registered MBean instance

onRegister

protected void onRegister(ObjectName objectName)

Called when an MBean is registered under the given ObjectName. Allows subclasses to perform additional processing when an MBean is registered.

The default implementation is empty. Can be overridden in subclasses.

Parameters:

objectName - the actual ObjectName that the MBean was registered with

onUnregister

protected void onUnregister(ObjectName objectName)

Called when an MBean is unregistered under the given ObjectName. Allows subclasses to perform additional processing when an MBean is unregistered.

The default implementation is empty. Can be overridden in subclasses.

Parameters:

objectName - the ObjectName that the MBean was registered with