/*
* Copyright 2002-2008 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.Iterator;
import java.util.LinkedHashMap;
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.DisposableBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.ListableBeanFactory;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.beans.factory.config.BeanDefinition;
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 <i>Spring-managed bean</i>
* to a JMX <code>MBeanServer</code>, without the need to define any
* JMX-specific information in the bean classes.
*
* <p>If the bean implements one of the JMX management interfaces,
* then MBeanExporter can simply register the MBean with the server
* automatically, through its autodetection process.
*
* <p>If the bean does not implement one of the JMX management interfaces,
* then MBeanExporter will create the management information using the
* supplied {@link MBeanInfoAssembler} implementation.
*
* <p>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.
*
* <p>This exporter is compatible with JMX 1.0 or higher for its basic
* functionality. However, for adapting AOP proxies where the target
* bean is a native MBean, JMX 1.2 is required. As of Spring 2.5,
* this class also autodetects and exports JDK 1.6 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 <code>MBeanExporter</code>.
*/
private static final String WILDCARD = "*";
/** Constant for the JMX <code>mr_type</code> "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 Map beans;
/** The autodetect mode to use for this MBeanExporter */
private Integer autodetectMode;
/** Whether to eagerly init candidate beans when autodetecting MBeans */
private boolean allowEagerInit = false;
/** Indicates whether Spring should modify generated ObjectNames */
private boolean ensureUniqueRuntimeObjectNames = true;
/** Indicates whether Spring should expose the managed resource ClassLoader in the MBean */
private boolean exposeManagedResourceClassLoader = true;
/** A set of bean names that should be excluded from autodetection */
private Set excludedBeans;
/** The MBeanExporterListeners registered with this exporter. */
private MBeanExporterListener[] listeners;
/** The NotificationListeners to register for the MBeans registered by this exporter */
private NotificationListenerBean[] notificationListeners;
/** Map of actually registered NotificationListeners */
private final Map registeredNotificationListeners = new LinkedHashMap();
/** Stores the MBeanInfoAssembler to use for this exporter */
private MBeanInfoAssembler assembler = new SimpleReflectiveMBeanInfoAssembler();
/** The strategy to use for creating ObjectNames for an object */
private ObjectNamingStrategy namingStrategy = new KeyNamingStrategy();
/** Stores the ClassLoader to use for generating lazy-init proxies */
private ClassLoader beanClassLoader = ClassUtils.getDefaultClassLoader();
/** Stores the BeanFactory for use in autodetection process */
private ListableBeanFactory beanFactory;
/**
* Supply a <code>Map</code> of beans to be registered with the JMX
* <code>MBeanServer</code>.
* <p>The String keys are the basis for the creation of JMX object names.
* By default, a JMX <code>ObjectName</code> will be created straight
* from the given key. This can be customized through specifying a
* custom <code>NamingStrategy</code>.
* <p>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 beans) {
this.beans = beans;
}
/**
* Set whether to autodetect MBeans in the bean factory that this exporter
* runs in. Will also ask an <code>AutodetectCapableMBeanInfoAssembler</code>
* if available.
* <p>This feature is turned off by default. Explicitly specify
* <code>true</code> here to enable autodetection.
* @see #setAssembler
* @see AutodetectCapableMBeanInfoAssembler
* @see #isMBean
*/
public void setAutodetect(boolean autodetect) {
this.autodetectMode = new Integer(autodetect ? AUTODETECT_ALL : AUTODETECT_NONE);
}
/**
* Set the autodetection mode to use.
* @exception IllegalArgumentException if the supplied value is not
* one of the <code>AUTODETECT_</code> 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(new Integer(autodetectMode))) {
throw new IllegalArgumentException("Only values of autodetect constants allowed");
}
this.autodetectMode = new Integer(autodetectMode);
}
/**
* Set the autodetection mode to use by name.
* @exception IllegalArgumentException if the supplied value is not resolvable
* to one of the <code>AUTODETECT_</code> constants or is <code>null</code>
* @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.
* <p>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 <code>MBeanInfoAssembler</code> interface to use
* for this exporter. Default is a <code>SimpleReflectiveMBeanInfoAssembler</code>.
* <p>The passed-in assembler can optionally implement the
* <code>AutodetectCapableMBeanInfoAssembler</code> 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 <code>ObjectNamingStrategy</code> interface
* to use for this exporter. Default is a <code>KeyNamingStrategy</code>.
* @see org.springframework.jmx.export.naming.KeyNamingStrategy
* @see org.springframework.jmx.export.naming.MetadataNamingStrategy
*/
public void setNamingStrategy(ObjectNamingStrategy namingStrategy) {
this.namingStrategy = namingStrategy;
}
/**
* Set the <code>MBeanExporterListener</code>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 HashSet(Arrays.asList(excludedBeans)) : null);
}
/**
* Indicates whether Spring should ensure that {@link ObjectName ObjectNames}
* generated by the configured {@link ObjectNamingStrategy} for
* runtime-registered MBeans should be modified to ensure uniqueness
* for every instance of a managed <code>Class</code>.
* <p>The default value is <code>true</code>.
* @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.
* <p>The default value is <code>true</code>, 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}.
* <P>The key of each entry in the <code>Map</code> 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 (<code>*</code>) for a key will cause the listener to be
* associated with all MBeans registered by this class at startup time.
* <p>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[])}.
* @throws IllegalArgumentException if the supplied <code>listeners</code> {@link Map} is <code>null</code>.
*/
public void setNotificationListenerMappings(Map listeners) {
Assert.notNull(listeners, "'listeners' must not be null");
List notificationListeners = new ArrayList(listeners.size());
for (Iterator iterator = listeners.entrySet().iterator(); iterator.hasNext();) {
Map.Entry entry = (Map.Entry) iterator.next();
// Get the listener from the map value.
Object value = entry.getValue();
if (!(value instanceof NotificationListener)) {
throw new IllegalArgumentException(
"Map entry value [" + value + "] is not a NotificationListener");
}
NotificationListenerBean bean = new NotificationListenerBean((NotificationListener) value);
// Get the ObjectName from the map key.
Object key = entry.getKey();
if (key != null && !WILDCARD.equals(key)) {
// This listener is mapped to a specific ObjectName.
bean.setMappedObjectName(entry.getKey());
}
notificationListeners.add(bean);
}
this.notificationListeners = (NotificationListenerBean[])
notificationListeners.toArray(new NotificationListenerBean[notificationListeners.size()]);
}
public void setBeanClassLoader(ClassLoader classLoader) {
this.beanClassLoader = classLoader;
}
/**
* This callback is only required for resolution of bean names in the
* {@link #setBeans(java.util.Map) "beans"} {@link Map} and for
* autodetection of MBeans (in the latter case, a
* <code>ListableBeanFactory</code> is required).
* @see #setBeans
* @see #setAutodetect
* @throws IllegalArgumentException if the supplied <code>beanFactory</code> is not a {@link ListableBeanFactory}.
*/
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
* <code>ApplicationContext</code>.
* @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 <code>ApplicationContext</code> 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 = null;
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);
}
}
//---------------------------------------------------------------------
// Exporter implementation
//---------------------------------------------------------------------
/**
* Registers the defined beans with the {@link MBeanServer}.
* <p>Each bean is exposed to the <code>MBeanServer</code> via a
* <code>ModelMBean</code>. The actual implemetation of the
* <code>ModelMBean</code> interface used depends on the implementation of
* the <code>ModelMBeanProvider</code> interface that is configured. By
* default the <code>RequiredModelMBean</code> class that is supplied with
* all JMX implementations is used.
* <p>The management interface produced for each bean is dependent on the
* <code>MBeanInfoAssembler</code> implementation being used. The
* <code>ObjectName</code> given to each bean is dependent on the
* implementation of the <code>ObjectNamingStrategy</code> 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 HashMap();
// Use AUTODETECT_ALL as default in no beans specified explicitly.
if (this.autodetectMode == null) {
this.autodetectMode = new Integer(AUTODETECT_ALL);
}
}
// Perform autodetection, if desired.
int mode = (this.autodetectMode != null ? this.autodetectMode.intValue() : AUTODETECT_NONE);
if (mode != AUTODETECT_NONE) {
if (this.beanFactory == null) {
throw new MBeanExportException("Cannot autodetect MBeans if not running in a BeanFactory");
}
if (mode == AUTODETECT_MBEAN || mode == AUTODETECT_ALL) {
// Autodetect any beans that are already MBeans.
this.logger.debug("Autodetecting user-defined JMX MBeans");
autodetectMBeans();
}
// Allow the assembler a chance to vote for bean inclusion.
if ((mode == AUTODETECT_ASSEMBLER || mode == AUTODETECT_ALL) &&
this.assembler instanceof AutodetectCapableMBeanInfoAssembler) {
autodetectBeans((AutodetectCapableMBeanInfoAssembler) this.assembler);
}
}
if (!this.beans.isEmpty()) {
for (Iterator it = this.beans.entrySet().iterator(); it.hasNext();) {
Map.Entry entry = (Map.Entry) it.next();
Assert.notNull(entry.getKey(), "Beans key must not be null");
String beanKey = entry.getKey().toString();
Object value = entry.getValue();
registerBeanNameOrInstance(value, beanKey);
}
}
}
/**
* Return whether the specified bean definition should be considered as lazy-init.
* @param beanFactory the bean factory that is supposed to contain the bean definition
* @param beanName the name of the bean to check
* @see org.springframework.beans.factory.config.ConfigurableListableBeanFactory#getBeanDefinition
* @see org.springframework.beans.factory.config.BeanDefinition#isLazyInit
*/
protected boolean isBeanDefinitionLazyInit(ListableBeanFactory beanFactory, String beanName) {
if (!(beanFactory instanceof ConfigurableListableBeanFactory)) {
return false;
}
try {
BeanDefinition bd = ((ConfigurableListableBeanFactory) beanFactory).getBeanDefinition(beanName);
return bd.isLazyInit();
}
catch (NoSuchBeanDefinitionException ex) {
// Probably a directly registered singleton.
return false;
}
}
/**
* Registers an individual bean with the {@link #setServer MBeanServer}.
* <p>This method is responsible for deciding <strong>how</strong> a bean
* should be exposed to the <code>MBeanServer</code>. Specifically, if the
* supplied <code>mapValue</code> is the name of a bean that is configured
* for lazy initialization, then a proxy to the resource is registered with
* the <code>MBeanServer</code> so that the the lazy load behavior is
* honored. If the bean is already an MBean then it will be registered
* directly with the <code>MBeanServer</code> without any intervention. For
* all other beans or bean names, the resource itself is registered with
* the <code>MBeanServer</code> directly.
* @param mapValue the value configured for this bean in the beans map;
* may be either the <code>String</code> name of a bean, or the bean itself
* @param beanKey the key associated with this bean in the beans map
* @return the <code>ObjectName</code> 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) {
Map beansOfSameType = this.beanFactory.getBeansOfType(mapValue.getClass(), false, false);
for (Iterator iterator = beansOfSameType.entrySet().iterator(); iterator.hasNext();) {
Map.Entry entry = (Map.Entry) iterator.next();
if (entry.getValue() == mapValue) {
String beanName = (String) entry.getKey();
ObjectName objectName = registerBeanInstance(mapValue, beanKey);
replaceNotificationListenerBeanNameKeysIfNecessary(beanName, objectName);
return objectName;
}
}
}
return registerBeanInstance(mapValue, beanKey);
}
}
catch (Exception ex) {
throw new UnableToRegisterMBeanException(
"Unable to register MBean [" + mapValue + "] with key '" + beanKey + "'", ex);
}
}
/**
* Replaces any bean names used as keys in the <code>NotificationListener</code>
* mappings with their corresponding <code>ObjectName</code> values.
* @param beanName the name of the bean to be registered
* @param objectName the <code>ObjectName</code> under which the bean will be registered
* with the <code>MBeanServer</code>
*/
private void replaceNotificationListenerBeanNameKeysIfNecessary(String beanName, ObjectName objectName) {
if (this.notificationListeners != null) {
for (int i = 0; i < this.notificationListeners.length; i++) {
this.notificationListeners[i].replaceObjectName(beanName, objectName);
}
}
}
/**
* Registers an existing MBean or an MBean adapter for a plain bean
* with the <code>MBeanServer</code>.
* @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 <code>ObjectName</code> under which the bean was registered
* with the <code>MBeanServer</code>
*/
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
* <code>MBeanServer<code> indirectly through a proxy.
* @param beanName the name of the bean in the <code>BeanFactory</code>
* @param beanKey the key associated with this bean in the beans map
* @return the <code>ObjectName</code> under which the bean was registered
* with the <code>MBeanServer</code>
*/
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 <code>ObjectName</code> for a bean.
* <p>If the bean implements the <code>SelfNaming</code> interface, then the
* <code>ObjectName</code> will be retrieved using <code>SelfNaming.getObjectName()</code>.
* Otherwise, the configured <code>ObjectNamingStrategy</code> is used.
* @param bean the name of the bean in the <code>BeanFactory</code>
* @param beanKey the key associated with the bean in the beans map
* @return the <code>ObjectName</code> for the supplied bean
* @throws javax.management.MalformedObjectNameException
* if the retrieved <code>ObjectName</code> 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.
* <p>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.
* <p>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 <code>null</code> if not possible
*/
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 <code>ModelMBean</code>.
* <p>This method is called to obtain a <code>ModelMBean</code> 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 <code>ModelMBean</code>
* @return a new instance of a class that implements <code>ModelMBean</code>
* @throws javax.management.MBeanException if creation of the ModelMBean failed
*/
protected ModelMBean createModelMBean() throws MBeanException {
return (this.exposeManagedResourceClassLoader ? new SpringModelMBean() : new RequiredModelMBean());
}
/**
* Gets the <code>ModelMBeanInfo</code> 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 <code>AutodetectCapableMBeanInfoAssembler</code>.
* Gives the assembler the opportunity to add additional beans from the
* <code>BeanFactory</code> to the list of beans to be exposed via JMX.
* <p>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 <code>ApplicationContext</code> that are
* valid MBeans and registers them automatically with the <code>MBeanServer</code>.
*/
private void autodetectMBeans() {
autodetect(new AutodetectCallback() {
public boolean include(Class beanClass, String beanName) {
return isMBean(beanClass);
}
});
}
/**
* Performs the actual autodetection process, delegating to an
* <code>AutodetectCallback</code> instance to vote on the inclusion of a
* given bean.
* @param callback the <code>AutodetectCallback</code> to use when deciding
* whether to include a bean or not
*/
private void autodetect(AutodetectCallback callback) {
String[] beanNames = this.beanFactory.getBeanNamesForType(Object.class, true, this.allowEagerInit);
for (int i = 0; i < beanNames.length; i++) {
String beanName = beanNames[i];
if (!isExcluded(beanName)) {
Class beanClass = this.beanFactory.getType(beanName);
if (beanClass != null && callback.include(beanClass, beanName)) {
boolean lazyInit = isBeanDefinitionLazyInit(this.beanFactory, beanName);
Object beanInstance = (!lazyInit ? this.beanFactory.getBean(beanName) : null);
if (!this.beans.containsValue(beanName) &&
(beanInstance == null || !CollectionUtils.containsInstance(this.beans.values(), beanInstance))) {
// Not already registered for JMX exposure.
this.beans.put(beanName, (beanInstance != null ? beanInstance : beanName));
if (logger.isInfoEnabled()) {
logger.info("Bean with name '" + beanName + "' has been autodetected for JMX exposure");
}
}
else {
if (logger.isDebugEnabled()) {
logger.debug("Bean with name '" + beanName + "' is already registered for JMX exposure");
}
}
}
}
}
}
/**
* Indicates whether or not a particular bean name is present in the excluded beans list.
*/
private boolean isExcluded(String beanName) {
return (this.excludedBeans != null && this.excludedBeans.contains(beanName));
}
//---------------------------------------------------------------------
// Notification and listener management
//---------------------------------------------------------------------
/**
* If the supplied managed resource implements the {@link NotificationPublisherAware} an instance of
* {@link org.springframework.jmx.export.notification.NotificationPublisher} is injected.
*/
private void injectNotificationPublisherIfNecessary(
Object managedResource, ModelMBean modelMBean, ObjectName objectName) {
if (managedResource instanceof NotificationPublisherAware) {
((NotificationPublisherAware) managedResource).setNotificationPublisher(
new ModelMBeanNotificationPublisher(modelMBean, objectName, managedResource));
}
}
/**
* Register the configured {@link NotificationListener NotificationListeners}
* with the {@link MBeanServer}.
*/
private void registerNotificationListeners() throws MBeanExportException {
if (this.notificationListeners != null) {
for (int i = 0; i < this.notificationListeners.length; i++) {
NotificationListenerBean bean = this.notificationListeners[i];
try {
ObjectName[] mappedObjectNames = bean.getResolvedObjectNames();
if (mappedObjectNames == null) {
// Mapped to all MBeans registered by the MBeanExporter.
mappedObjectNames = getRegisteredObjectNames();
}
if (this.registeredNotificationListeners.put(bean, mappedObjectNames) == null) {
for (int j = 0; j < mappedObjectNames.length; j++) {
this.server.addNotificationListener(mappedObjectNames[j],
bean.getNotificationListener(), bean.getNotificationFilter(), bean.getHandback());
}
}
}
catch (Exception ex) {
throw new MBeanExportException("Unable to register NotificationListener", ex);
}
}
}
}
/**
* Unregister the configured {@link NotificationListener NotificationListeners}
* from the {@link MBeanServer}.
*/
private void unregisterNotificationListeners() {
for (Iterator it = this.registeredNotificationListeners.entrySet().iterator(); it.hasNext();) {
Map.Entry entry = (Map.Entry) it.next();
NotificationListenerBean bean = (NotificationListenerBean) entry.getKey();
ObjectName[] mappedObjectNames = (ObjectName[]) entry.getValue();
for (int j = 0; j < mappedObjectNames.length; j++) {
try {
this.server.removeNotificationListener(mappedObjectNames[j],
bean.getNotificationListener(), bean.getNotificationFilter(), bean.getHandback());
}
catch (Exception ex) {
if (logger.isDebugEnabled()) {
logger.debug("Unable to unregister NotificationListener", ex);
}
}
}
}
this.registeredNotificationListeners.clear();
}
/**
* Called when an MBean is registered. Notifies all registered
* {@link MBeanExporterListener MBeanExporterListeners} of the registration event.
* <p>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 <code>ObjectName</code> of the registered MBean
*/
protected void onRegister(ObjectName objectName) {
notifyListenersOfRegistration(objectName);
}
/**
* Called when an MBean is unregistered. Notifies all registered
* {@link MBeanExporterListener MBeanExporterListeners} of the unregistration event.
* <p>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 <code>ObjectName</code> of the unregistered MBean
*/
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 (int i = 0; i < this.listeners.length; i++) {
this.listeners[i].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 (int i = 0; i < this.listeners.length; i++) {
this.listeners[i].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;
}
protected void postProcessTargetObject(Object targetObject) {
injectNotificationPublisherIfNecessary(targetObject, this.modelMBean, this.objectName);
}
}
}