/* * Copyright 2002-2010 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.springframework.jmx.export; import java.util.ArrayList; import java.util.Arrays; import java.util.HashMap; import java.util.HashSet; import java.util.LinkedHashMap; import java.util.LinkedHashSet; import java.util.List; import java.util.Map; import java.util.Set; import javax.management.DynamicMBean; import javax.management.JMException; import javax.management.MBeanException; import javax.management.MBeanServer; import javax.management.MalformedObjectNameException; import javax.management.NotCompliantMBeanException; import javax.management.NotificationListener; import javax.management.ObjectName; import javax.management.StandardMBean; import javax.management.modelmbean.ModelMBean; import javax.management.modelmbean.ModelMBeanInfo; import javax.management.modelmbean.RequiredModelMBean; import org.springframework.aop.framework.ProxyFactory; import org.springframework.aop.support.AopUtils; import org.springframework.aop.target.LazyInitTargetSource; import org.springframework.beans.factory.BeanClassLoaderAware; import org.springframework.beans.factory.BeanFactory; import org.springframework.beans.factory.BeanFactoryAware; import org.springframework.beans.factory.CannotLoadBeanClassException; import org.springframework.beans.factory.DisposableBean; import org.springframework.beans.factory.InitializingBean; import org.springframework.beans.factory.ListableBeanFactory; import org.springframework.beans.factory.config.ConfigurableBeanFactory; import org.springframework.beans.factory.config.ConfigurableListableBeanFactory; import org.springframework.core.Constants; import org.springframework.jmx.export.assembler.AutodetectCapableMBeanInfoAssembler; import org.springframework.jmx.export.assembler.MBeanInfoAssembler; import org.springframework.jmx.export.assembler.SimpleReflectiveMBeanInfoAssembler; import org.springframework.jmx.export.naming.KeyNamingStrategy; import org.springframework.jmx.export.naming.ObjectNamingStrategy; import org.springframework.jmx.export.naming.SelfNaming; import org.springframework.jmx.export.notification.ModelMBeanNotificationPublisher; import org.springframework.jmx.export.notification.NotificationPublisherAware; import org.springframework.jmx.support.JmxUtils; import org.springframework.jmx.support.MBeanRegistrationSupport; import org.springframework.util.Assert; import org.springframework.util.ClassUtils; import org.springframework.util.CollectionUtils; import org.springframework.util.ObjectUtils; /** * JMX exporter that allows for exposing any Spring-managed bean to a * JMX {@link javax.management.MBeanServer}, without the need to define any * JMX-specific information in the bean classes. * *
If a bean implements one of the JMX management interfaces, MBeanExporter can * simply register the MBean with the server through its autodetection process. * *
If a bean does not implement one of the JMX management interfaces, MBeanExporter * will create the management information using the supplied {@link MBeanInfoAssembler}. * *
A list of {@link MBeanExporterListener MBeanExporterListeners} can be registered * via the {@link #setListeners(MBeanExporterListener[]) listeners} property, allowing * application code to be notified of MBean registration and unregistration events. * *
This exporter is compatible with JMX 1.2 on Java 5 and above.
* As of Spring 2.5, it also autodetects and exports Java 6 MXBeans.
*
* @author Rob Harrop
* @author Juergen Hoeller
* @author Rick Evans
* @author Mark Fisher
* @since 1.2
* @see #setBeans
* @see #setAutodetect
* @see #setAssembler
* @see #setListeners
* @see org.springframework.jmx.export.assembler.MBeanInfoAssembler
* @see MBeanExporterListener
*/
public class MBeanExporter extends MBeanRegistrationSupport
implements MBeanExportOperations, BeanClassLoaderAware, BeanFactoryAware, InitializingBean, DisposableBean {
/**
* Autodetection mode indicating that no autodetection should be used.
*/
public static final int AUTODETECT_NONE = 0;
/**
* Autodetection mode indicating that only valid MBeans should be autodetected.
*/
public static final int AUTODETECT_MBEAN = 1;
/**
* Autodetection mode indicating that only the {@link MBeanInfoAssembler} should be able
* to autodetect beans.
*/
public static final int AUTODETECT_ASSEMBLER = 2;
/**
* Autodetection mode indicating that all autodetection mechanisms should be used.
*/
public static final int AUTODETECT_ALL = AUTODETECT_MBEAN | AUTODETECT_ASSEMBLER;
/**
* Wildcard used to map a {@link javax.management.NotificationListener}
* to all MBeans registered by the The String keys are the basis for the creation of JMX object names.
* By default, a JMX Both bean instances and bean names are allowed as values.
* Bean instances are typically linked in through bean references.
* Bean names will be resolved as beans in the current factory, respecting
* lazy-init markers (that is, not triggering initialization of such beans).
* @param beans Map with JMX names as keys and bean instances or bean names
* as values
* @see #setNamingStrategy
* @see org.springframework.jmx.export.naming.KeyNamingStrategy
* @see javax.management.ObjectName#ObjectName(String)
*/
public void setBeans(Map This feature is turned off by default. Explicitly specify
* Default is "false", respecting lazy-init flags on bean definitions.
* Switch this to "true" in order to search lazy-init beans as well,
* including FactoryBean-produced objects that haven't been initialized yet.
*/
public void setAllowEagerInit(boolean allowEagerInit) {
this.allowEagerInit = allowEagerInit;
}
/**
* Set the implementation of the The passed-in assembler can optionally implement the
* The default value is The default value is The key of each entry in the The value of each entry is the
* {@link javax.management.NotificationListener} to register. For more
* advanced options such as registering
* {@link javax.management.NotificationFilter NotificationFilters} and
* handback objects see {@link #setNotificationListeners(NotificationListenerBean[])}.
*/
public void setNotificationListenerMappings(Map, ? extends NotificationListener> listeners) {
Assert.notNull(listeners, "'listeners' must not be null");
List Each bean is exposed to the The management interface produced for each bean is dependent on the
* This method is responsible for deciding how a bean
* should be exposed to the If the bean implements the The default implementation delegates to {@link JmxUtils#isMBean},
* which checks for {@link javax.management.DynamicMBean} classes as well
* as classes with corresponding "*MBean" interface (Standard MBeans)
* or corresponding "*MXBean" interface (Java 6 MXBeans).
* @param beanClass the bean class to analyze
* @return whether the class qualifies as an MBean
* @see org.springframework.jmx.support.JmxUtils#isMBean(Class)
*/
protected boolean isMBean(Class beanClass) {
return JmxUtils.isMBean(beanClass);
}
/**
* Build an adapted MBean for the given bean instance, if possible.
* The default implementation builds a JMX 1.2 StandardMBean
* for the target's MBean/MXBean interface in case of an AOP proxy,
* delegating the interface's management operations to the proxy.
* @param bean the original bean instance
* @return the adapted MBean, or This method is called to obtain a This implementation prevents a bean from being added to the list
* automatically if it has already been added manually, and it prevents
* certain internal classes from being registered automatically.
*/
private void autodetectBeans(final AutodetectCapableMBeanInfoAssembler assembler) {
autodetect(new AutodetectCallback() {
public boolean include(Class beanClass, String beanName) {
return assembler.includeBean(beanClass, beanName);
}
});
}
/**
* Attempts to detect any beans defined in the Please note that if an {@link MBeanExporterListener} throws a (runtime)
* exception when notified, this will essentially interrupt the notification process
* and any remaining listeners that have yet to be notified will not (obviously)
* receive the {@link MBeanExporterListener#mbeanRegistered(javax.management.ObjectName)}
* callback.
* @param objectName the Please note that if an {@link MBeanExporterListener} throws a (runtime)
* exception when notified, this will essentially interrupt the notification process
* and any remaining listeners that have yet to be notified will not (obviously)
* receive the {@link MBeanExporterListener#mbeanUnregistered(javax.management.ObjectName)}
* callback.
* @param objectName the MBeanExporter
.
*/
private static final String WILDCARD = "*";
/** Constant for the JMX mr_type
"ObjectReference" */
private static final String MR_TYPE_OBJECT_REFERENCE = "ObjectReference";
/** Prefix for the autodetect constants defined in this class */
private static final String CONSTANT_PREFIX_AUTODETECT = "AUTODETECT_";
/** Constants instance for this class */
private static final Constants constants = new Constants(MBeanExporter.class);
/** The beans to be exposed as JMX managed resources, with JMX names as keys */
private MapMap
of beans to be registered with the JMX
* MBeanServer
.
* ObjectName
will be created straight
* from the given key. This can be customized through specifying a
* custom NamingStrategy
.
* AutodetectCapableMBeanInfoAssembler
* if available.
* true
here to enable autodetection.
* @see #setAssembler
* @see AutodetectCapableMBeanInfoAssembler
* @see #isMBean
*/
public void setAutodetect(boolean autodetect) {
this.autodetectMode = (autodetect ? AUTODETECT_ALL : AUTODETECT_NONE);
}
/**
* Set the autodetection mode to use.
* @exception IllegalArgumentException if the supplied value is not
* one of the AUTODETECT_
constants
* @see #setAutodetectModeName(String)
* @see #AUTODETECT_ALL
* @see #AUTODETECT_ASSEMBLER
* @see #AUTODETECT_MBEAN
* @see #AUTODETECT_NONE
*/
public void setAutodetectMode(int autodetectMode) {
if (!constants.getValues(CONSTANT_PREFIX_AUTODETECT).contains(autodetectMode)) {
throw new IllegalArgumentException("Only values of autodetect constants allowed");
}
this.autodetectMode = autodetectMode;
}
/**
* Set the autodetection mode to use by name.
* @exception IllegalArgumentException if the supplied value is not resolvable
* to one of the AUTODETECT_
constants or is null
* @see #setAutodetectMode(int)
* @see #AUTODETECT_ALL
* @see #AUTODETECT_ASSEMBLER
* @see #AUTODETECT_MBEAN
* @see #AUTODETECT_NONE
*/
public void setAutodetectModeName(String constantName) {
if (constantName == null || !constantName.startsWith(CONSTANT_PREFIX_AUTODETECT)) {
throw new IllegalArgumentException("Only autodetect constants allowed");
}
this.autodetectMode = (Integer) constants.asNumber(constantName);
}
/**
* Specify whether to allow eager initialization of candidate beans
* when autodetecting MBeans in the Spring application context.
* MBeanInfoAssembler
interface to use
* for this exporter. Default is a SimpleReflectiveMBeanInfoAssembler
.
* AutodetectCapableMBeanInfoAssembler
interface, which enables it
* to participate in the exporter's MBean autodetection process.
* @see org.springframework.jmx.export.assembler.SimpleReflectiveMBeanInfoAssembler
* @see org.springframework.jmx.export.assembler.AutodetectCapableMBeanInfoAssembler
* @see org.springframework.jmx.export.assembler.MetadataMBeanInfoAssembler
* @see #setAutodetect
*/
public void setAssembler(MBeanInfoAssembler assembler) {
this.assembler = assembler;
}
/**
* Set the implementation of the ObjectNamingStrategy
interface
* to use for this exporter. Default is a KeyNamingStrategy
.
* @see org.springframework.jmx.export.naming.KeyNamingStrategy
* @see org.springframework.jmx.export.naming.MetadataNamingStrategy
*/
public void setNamingStrategy(ObjectNamingStrategy namingStrategy) {
this.namingStrategy = namingStrategy;
}
/**
* Set the MBeanExporterListener
s that should be notified
* of MBean registration and unregistration events.
* @see MBeanExporterListener
*/
public void setListeners(MBeanExporterListener[] listeners) {
this.listeners = listeners;
}
/**
* Set the list of names for beans that should be excluded from autodetection.
*/
public void setExcludedBeans(String[] excludedBeans) {
this.excludedBeans = (excludedBeans != null ? new HashSetClass
.
* true
.
* @see #registerManagedResource
* @see JmxUtils#appendIdentityToObjectName(javax.management.ObjectName, Object)
*/
public void setEnsureUniqueRuntimeObjectNames(boolean ensureUniqueRuntimeObjectNames) {
this.ensureUniqueRuntimeObjectNames = ensureUniqueRuntimeObjectNames;
}
/**
* Indicates whether or not the managed resource should be exposed on the
* {@link Thread#getContextClassLoader() thread context ClassLoader} before
* allowing any invocations on the MBean to occur.
* true
, exposing a {@link SpringModelMBean}
* which performs thread context ClassLoader management. Switch this flag off to
* expose a standard JMX {@link javax.management.modelmbean.RequiredModelMBean}.
*/
public void setExposeManagedResourceClassLoader(boolean exposeManagedResourceClassLoader) {
this.exposeManagedResourceClassLoader = exposeManagedResourceClassLoader;
}
/**
* Set the {@link NotificationListenerBean NotificationListenerBeans}
* containing the
* {@link javax.management.NotificationListener NotificationListeners}
* that will be registered with the {@link MBeanServer}.
* @see #setNotificationListenerMappings(java.util.Map)
* @see NotificationListenerBean
*/
public void setNotificationListeners(NotificationListenerBean[] notificationListeners) {
this.notificationListeners = notificationListeners;
}
/**
* Set the {@link NotificationListener NotificationListeners} to register
* with the {@link javax.management.MBeanServer}.
* Map
is a {@link String}
* representation of the {@link javax.management.ObjectName} or the bean
* name of the MBean the listener should be registered for. Specifying an
* asterisk (*
) for a key will cause the listener to be
* associated with all MBeans registered by this class at startup time.
* ListableBeanFactory
is required).
* @see #setBeans
* @see #setAutodetect
*/
public void setBeanFactory(BeanFactory beanFactory) {
if (beanFactory instanceof ListableBeanFactory) {
this.beanFactory = (ListableBeanFactory) beanFactory;
}
else {
logger.info("MBeanExporter not running in a ListableBeanFactory: autodetection of MBeans not available.");
}
}
//---------------------------------------------------------------------
// Lifecycle in bean factory: automatically register/unregister beans
//---------------------------------------------------------------------
/**
* Start bean registration automatically when deployed in an
* ApplicationContext
.
* @see #registerBeans()
*/
public void afterPropertiesSet() {
// If no server was provided then try to find one. This is useful in an environment
// such as JDK 1.5, Tomcat or JBoss where there is already an MBeanServer loaded.
if (this.server == null) {
this.server = JmxUtils.locateMBeanServer();
}
try {
logger.info("Registering beans for JMX exposure on startup");
registerBeans();
registerNotificationListeners();
}
catch (RuntimeException ex) {
// Unregister beans already registered by this exporter.
unregisterNotificationListeners();
unregisterBeans();
throw ex;
}
}
/**
* Unregisters all beans that this exported has exposed via JMX
* when the enclosing ApplicationContext
is destroyed.
*/
public void destroy() {
logger.info("Unregistering JMX-exposed beans on shutdown");
unregisterNotificationListeners();
unregisterBeans();
}
//---------------------------------------------------------------------
// Implementation of MBeanExportOperations interface
//---------------------------------------------------------------------
public ObjectName registerManagedResource(Object managedResource) throws MBeanExportException {
Assert.notNull(managedResource, "Managed resource must not be null");
ObjectName objectName;
try {
objectName = getObjectName(managedResource, null);
if (this.ensureUniqueRuntimeObjectNames) {
objectName = JmxUtils.appendIdentityToObjectName(objectName, managedResource);
}
}
catch (Exception ex) {
throw new MBeanExportException("Unable to generate ObjectName for MBean [" + managedResource + "]", ex);
}
registerManagedResource(managedResource, objectName);
return objectName;
}
public void registerManagedResource(Object managedResource, ObjectName objectName) throws MBeanExportException {
Assert.notNull(managedResource, "Managed resource must not be null");
Assert.notNull(objectName, "ObjectName must not be null");
try {
if (isMBean(managedResource.getClass())) {
doRegister(managedResource, objectName);
}
else {
ModelMBean mbean = createAndConfigureMBean(managedResource, managedResource.getClass().getName());
doRegister(mbean, objectName);
injectNotificationPublisherIfNecessary(managedResource, mbean, objectName);
}
}
catch (JMException ex) {
throw new UnableToRegisterMBeanException(
"Unable to register MBean [" + managedResource + "] with object name [" + objectName + "]", ex);
}
}
public void unregisterManagedResource(ObjectName objectName) {
Assert.notNull(objectName, "ObjectName must not be null");
doUnregister(objectName);
}
//---------------------------------------------------------------------
// Exporter implementation
//---------------------------------------------------------------------
/**
* Registers the defined beans with the {@link MBeanServer}.
* MBeanServer
via a
* ModelMBean
. The actual implemetation of the
* ModelMBean
interface used depends on the implementation of
* the ModelMBeanProvider
interface that is configured. By
* default the RequiredModelMBean
class that is supplied with
* all JMX implementations is used.
* MBeanInfoAssembler
implementation being used. The
* ObjectName
given to each bean is dependent on the
* implementation of the ObjectNamingStrategy
interface being used.
*/
protected void registerBeans() {
// The beans property may be null, for example if we are relying solely on autodetection.
if (this.beans == null) {
this.beans = new HashMapMBeanServer
. Specifically, if the
* supplied mapValue
is the name of a bean that is configured
* for lazy initialization, then a proxy to the resource is registered with
* the MBeanServer
so that the the lazy load behavior is
* honored. If the bean is already an MBean then it will be registered
* directly with the MBeanServer
without any intervention. For
* all other beans or bean names, the resource itself is registered with
* the MBeanServer
directly.
* @param mapValue the value configured for this bean in the beans map;
* may be either the String
name of a bean, or the bean itself
* @param beanKey the key associated with this bean in the beans map
* @return the ObjectName
under which the resource was registered
* @throws MBeanExportException if the export failed
* @see #setBeans
* @see #registerBeanInstance
* @see #registerLazyInit
*/
protected ObjectName registerBeanNameOrInstance(Object mapValue, String beanKey) throws MBeanExportException {
try {
if (mapValue instanceof String) {
// Bean name pointing to a potentially lazy-init bean in the factory.
if (this.beanFactory == null) {
throw new MBeanExportException("Cannot resolve bean names if not running in a BeanFactory");
}
String beanName = (String) mapValue;
if (isBeanDefinitionLazyInit(this.beanFactory, beanName)) {
ObjectName objectName = registerLazyInit(beanName, beanKey);
replaceNotificationListenerBeanNameKeysIfNecessary(beanName, objectName);
return objectName;
}
else {
Object bean = this.beanFactory.getBean(beanName);
ObjectName objectName = registerBeanInstance(bean, beanKey);
replaceNotificationListenerBeanNameKeysIfNecessary(beanName, objectName);
return objectName;
}
}
else {
// Plain bean instance -> register it directly.
if (this.beanFactory != null) {
MapNotificationListener
* mappings with their corresponding ObjectName
values.
* @param beanName the name of the bean to be registered
* @param objectName the ObjectName
under which the bean will be registered
* with the MBeanServer
*/
private void replaceNotificationListenerBeanNameKeysIfNecessary(String beanName, ObjectName objectName) {
if (this.notificationListeners != null) {
for (NotificationListenerBean notificationListener : this.notificationListeners) {
notificationListener.replaceObjectName(beanName, objectName);
}
}
}
/**
* Registers an existing MBean or an MBean adapter for a plain bean
* with the MBeanServer
.
* @param bean the bean to register, either an MBean or a plain bean
* @param beanKey the key associated with this bean in the beans map
* @return the ObjectName
under which the bean was registered
* with the MBeanServer
*/
private ObjectName registerBeanInstance(Object bean, String beanKey) throws JMException {
ObjectName objectName = getObjectName(bean, beanKey);
Object mbeanToExpose = null;
if (isMBean(bean.getClass())) {
mbeanToExpose = bean;
}
else {
DynamicMBean adaptedBean = adaptMBeanIfPossible(bean);
if (adaptedBean != null) {
mbeanToExpose = adaptedBean;
}
}
if (mbeanToExpose != null) {
if (logger.isInfoEnabled()) {
logger.info("Located MBean '" + beanKey + "': registering with JMX server as MBean [" +
objectName + "]");
}
doRegister(mbeanToExpose, objectName);
}
else {
if (logger.isInfoEnabled()) {
logger.info("Located managed bean '" + beanKey + "': registering with JMX server as MBean [" +
objectName + "]");
}
ModelMBean mbean = createAndConfigureMBean(bean, beanKey);
doRegister(mbean, objectName);
injectNotificationPublisherIfNecessary(bean, mbean, objectName);
}
return objectName;
}
/**
* Registers beans that are configured for lazy initialization with the
* MBeanServer
indirectly through a proxy.
* @param beanName the name of the bean in the
BeanFactory
* @param beanKey the key associated with this bean in the beans map
* @return the ObjectName
under which the bean was registered
* with the MBeanServer
*/
private ObjectName registerLazyInit(String beanName, String beanKey) throws JMException {
ProxyFactory proxyFactory = new ProxyFactory();
proxyFactory.setProxyTargetClass(true);
proxyFactory.setFrozen(true);
if (isMBean(this.beanFactory.getType(beanName))) {
// A straight MBean... Let's create a simple lazy-init CGLIB proxy for it.
LazyInitTargetSource targetSource = new LazyInitTargetSource();
targetSource.setTargetBeanName(beanName);
targetSource.setBeanFactory(this.beanFactory);
proxyFactory.setTargetSource(targetSource);
Object proxy = proxyFactory.getProxy(this.beanClassLoader);
ObjectName objectName = getObjectName(proxy, beanKey);
if (logger.isDebugEnabled()) {
logger.debug("Located MBean '" + beanKey + "': registering with JMX server as lazy-init MBean [" +
objectName + "]");
}
doRegister(proxy, objectName);
return objectName;
}
else {
// A simple bean... Let's create a lazy-init ModelMBean proxy with notification support.
NotificationPublisherAwareLazyTargetSource targetSource = new NotificationPublisherAwareLazyTargetSource();
targetSource.setTargetBeanName(beanName);
targetSource.setBeanFactory(this.beanFactory);
proxyFactory.setTargetSource(targetSource);
Object proxy = proxyFactory.getProxy(this.beanClassLoader);
ObjectName objectName = getObjectName(proxy, beanKey);
if (logger.isDebugEnabled()) {
logger.debug("Located simple bean '" + beanKey + "': registering with JMX server as lazy-init MBean [" +
objectName + "]");
}
ModelMBean mbean = createAndConfigureMBean(proxy, beanKey);
targetSource.setModelMBean(mbean);
targetSource.setObjectName(objectName);
doRegister(mbean, objectName);
return objectName;
}
}
/**
* Retrieve the ObjectName
for a bean.
* SelfNaming
interface, then the
* ObjectName
will be retrieved using SelfNaming.getObjectName()
.
* Otherwise, the configured ObjectNamingStrategy
is used.
* @param bean the name of the bean in the BeanFactory
* @param beanKey the key associated with the bean in the beans map
* @return the ObjectName
for the supplied bean
* @throws javax.management.MalformedObjectNameException
* if the retrieved ObjectName
is malformed
*/
protected ObjectName getObjectName(Object bean, String beanKey) throws MalformedObjectNameException {
if (bean instanceof SelfNaming) {
return ((SelfNaming) bean).getObjectName();
}
else {
return this.namingStrategy.getObjectName(bean, beanKey);
}
}
/**
* Determine whether the given bean class qualifies as an MBean as-is.
* null
if not possible
*/
@SuppressWarnings("unchecked")
protected DynamicMBean adaptMBeanIfPossible(Object bean) throws JMException {
Class targetClass = AopUtils.getTargetClass(bean);
if (targetClass != bean.getClass()) {
Class ifc = JmxUtils.getMXBeanInterface(targetClass);
if (ifc != null) {
if (!(ifc.isInstance(bean))) {
throw new NotCompliantMBeanException("Managed bean [" + bean +
"] has a target class with an MXBean interface but does not expose it in the proxy");
}
return new StandardMBean(bean, ifc, true);
}
else {
ifc = JmxUtils.getMBeanInterface(targetClass);
if (ifc != null) {
if (!(ifc.isInstance(bean))) {
throw new NotCompliantMBeanException("Managed bean [" + bean +
"] has a target class with an MBean interface but does not expose it in the proxy");
}
return new StandardMBean(bean, ifc);
}
}
}
return null;
}
/**
* Creates an MBean that is configured with the appropriate management
* interface for the supplied managed resource.
* @param managedResource the resource that is to be exported as an MBean
* @param beanKey the key associated with the managed bean
* @see #createModelMBean()
* @see #getMBeanInfo(Object, String)
*/
protected ModelMBean createAndConfigureMBean(Object managedResource, String beanKey)
throws MBeanExportException {
try {
ModelMBean mbean = createModelMBean();
mbean.setModelMBeanInfo(getMBeanInfo(managedResource, beanKey));
mbean.setManagedResource(managedResource, MR_TYPE_OBJECT_REFERENCE);
return mbean;
}
catch (Exception ex) {
throw new MBeanExportException("Could not create ModelMBean for managed resource [" +
managedResource + "] with key '" + beanKey + "'", ex);
}
}
/**
* Create an instance of a class that implements ModelMBean
.
* ModelMBean
instance to
* use when registering a bean. This method is called once per bean during the
* registration phase and must return a new instance of ModelMBean
* @return a new instance of a class that implements ModelMBean
* @throws javax.management.MBeanException if creation of the ModelMBean failed
*/
protected ModelMBean createModelMBean() throws MBeanException {
return (this.exposeManagedResourceClassLoader ? new SpringModelMBean() : new RequiredModelMBean());
}
/**
* Gets the ModelMBeanInfo
for the bean with the supplied key
* and of the supplied type.
*/
private ModelMBeanInfo getMBeanInfo(Object managedBean, String beanKey) throws JMException {
ModelMBeanInfo info = this.assembler.getMBeanInfo(managedBean, beanKey);
if (logger.isWarnEnabled() && ObjectUtils.isEmpty(info.getAttributes()) &&
ObjectUtils.isEmpty(info.getOperations())) {
logger.warn("Bean with key '" + beanKey +
"' has been registered as an MBean but has no exposed attributes or operations");
}
return info;
}
//---------------------------------------------------------------------
// Autodetection process
//---------------------------------------------------------------------
/**
* Invoked when using an AutodetectCapableMBeanInfoAssembler
.
* Gives the assembler the opportunity to add additional beans from the
* BeanFactory
to the list of beans to be exposed via JMX.
* ApplicationContext
that are
* valid MBeans and registers them automatically with the MBeanServer
.
*/
private void autodetectMBeans() {
autodetect(new AutodetectCallback() {
public boolean include(Class beanClass, String beanName) {
return isMBean(beanClass);
}
});
}
/**
* Performs the actual autodetection process, delegating to an
* AutodetectCallback
instance to vote on the inclusion of a
* given bean.
* @param callback the AutodetectCallback
to use when deciding
* whether to include a bean or not
*/
private void autodetect(AutodetectCallback callback) {
SetObjectName
of the registered MBean
*/
@Override
protected void onRegister(ObjectName objectName) {
notifyListenersOfRegistration(objectName);
}
/**
* Called when an MBean is unregistered. Notifies all registered
* {@link MBeanExporterListener MBeanExporterListeners} of the unregistration event.
* ObjectName
of the unregistered MBean
*/
@Override
protected void onUnregister(ObjectName objectName) {
notifyListenersOfUnregistration(objectName);
}
/**
* Notifies all registered {@link MBeanExporterListener MBeanExporterListeners} of the
* registration of the MBean identified by the supplied {@link ObjectName}.
*/
private void notifyListenersOfRegistration(ObjectName objectName) {
if (this.listeners != null) {
for (MBeanExporterListener listener : this.listeners) {
listener.mbeanRegistered(objectName);
}
}
}
/**
* Notifies all registered {@link MBeanExporterListener MBeanExporterListeners} of the
* unregistration of the MBean identified by the supplied {@link ObjectName}.
*/
private void notifyListenersOfUnregistration(ObjectName objectName) {
if (this.listeners != null) {
for (MBeanExporterListener listener : this.listeners) {
listener.mbeanUnregistered(objectName);
}
}
}
//---------------------------------------------------------------------
// Inner classes for internal use
//---------------------------------------------------------------------
/**
* Internal callback interface for the autodetection process.
*/
private static interface AutodetectCallback {
/**
* Called during the autodetection process to decide whether
* or not a bean should be included.
* @param beanClass the class of the bean
* @param beanName the name of the bean
*/
boolean include(Class beanClass, String beanName);
}
/**
* Extension of {@link LazyInitTargetSource} that will inject a
* {@link org.springframework.jmx.export.notification.NotificationPublisher}
* into the lazy resource as it is created if required.
*/
private class NotificationPublisherAwareLazyTargetSource extends LazyInitTargetSource {
private ModelMBean modelMBean;
private ObjectName objectName;
public void setModelMBean(ModelMBean modelMBean) {
this.modelMBean = modelMBean;
}
public void setObjectName(ObjectName objectName) {
this.objectName = objectName;
}
@Override
protected void postProcessTargetObject(Object targetObject) {
injectNotificationPublisherIfNecessary(targetObject, this.modelMBean, this.objectName);
}
}
}