Package org.springframework.jmx.support

Class JmxUtils

java.lang.Object

org.springframework.jmx.support.JmxUtils

public abstract class JmxUtils
extends Object

Collection of generic utility methods to support Spring JMX. Includes a convenient method to locate an MBeanServer.

Since:

1.2

Author:

Rob Harrop, Juergen Hoeller

See Also:

• locateMBeanServer()

Field Summary

Fields

Modifier and Type	Field	Description
static final String	IDENTITY_OBJECT_NAME_KEY	The key used when extending an existing ObjectName with the identity hash code of its corresponding managed resource.

Constructor Summary

Constructors

Constructor	Description
JmxUtils()

Method Summary

Modifier and Type	Method	Description
static ObjectName	appendIdentityToObjectName(ObjectName objectName, Object managedResource)	Append an additional key/value pair to an existing ObjectName with the key being the static value identity and the value being the identity hash code of the managed resource being exposed on the supplied ObjectName.
static String	getAttributeName(PropertyDescriptor property, boolean useStrictCasing)	Return the JMX attribute name to use for the given JavaBeans property.
static Class<?>	getClassToExpose(Class<?> clazz)	Return the class or interface to expose for the given bean class.
static Class<?>	getClassToExpose(Object managedBean)	Return the class or interface to expose for the given bean.
static Class<?>	getMBeanInterface(Class<?> clazz)	Return the Standard MBean interface for the given class, if any (that is, an interface whose name matches the class name of the given class but with suffix "MBean").
static String[]	getMethodSignature(Method method)	Create a String[] representing the argument signature of a method.
static Class<?>	getMXBeanInterface(Class<?> clazz)	Return the Java 6 MXBean interface exists for the given class, if any (that is, an interface whose name ends with "MXBean" and/or carries an appropriate MXBean annotation).
static boolean	isMBean(Class<?> clazz)	Determine whether the given bean class qualifies as an MBean as-is.
static MBeanServer	locateMBeanServer()	Attempt to find a locally running MBeanServer.
static MBeanServer	locateMBeanServer(String agentId)	Attempt to find a locally running MBeanServer.
static Class<?>[]	parameterInfoToTypes(MBeanParameterInfo[] paramInfo)	Convert an array of MBeanParameterInfo into an array of Class instances corresponding to the parameters.
static Class<?>[]	parameterInfoToTypes(MBeanParameterInfo[] paramInfo, ClassLoader classLoader)	Convert an array of MBeanParameterInfo into an array of Class instances corresponding to the parameters.

Methods inherited from class java.lang.Object

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

Field Details

IDENTITY_OBJECT_NAME_KEY

public static final String IDENTITY_OBJECT_NAME_KEY

The key used when extending an existing ObjectName with the identity hash code of its corresponding managed resource.

See Also:

• Constant Field Values

Constructor Details

JmxUtils

public JmxUtils()

Method Details

locateMBeanServer

public static MBeanServer locateMBeanServer()
                                     throws MBeanServerNotFoundException

Attempt to find a locally running MBeanServer. Fails if no MBeanServer can be found. Logs a warning if more than one MBeanServer found, returning the first one from the list.

Returns:

the MBeanServer if found

Throws:

MBeanServerNotFoundException - if no MBeanServer could be found

See Also:

• MBeanServerFactory.findMBeanServer(java.lang.String)

locateMBeanServer

public static MBeanServer locateMBeanServer(@Nullable
 String agentId)
                                     throws MBeanServerNotFoundException

Attempt to find a locally running MBeanServer. Fails if no MBeanServer can be found. Logs a warning if more than one MBeanServer found, returning the first one from the list.

Parameters:

agentId - the agent identifier of the MBeanServer to retrieve. If this parameter is null, all registered MBeanServers are considered. If the empty String is given, the platform MBeanServer will be returned.

Returns:

the MBeanServer if found

Throws:

MBeanServerNotFoundException - if no MBeanServer could be found

See Also:

• MBeanServerFactory.findMBeanServer(String)

parameterInfoToTypes

@Nullable
public static Class<?>[] parameterInfoToTypes(@Nullable
 MBeanParameterInfo[] paramInfo)
                                       throws ClassNotFoundException

Convert an array of MBeanParameterInfo into an array of Class instances corresponding to the parameters.

Parameters:

paramInfo - the JMX parameter info

Returns:

the parameter types as classes

Throws:

ClassNotFoundException - if a parameter type could not be resolved

parameterInfoToTypes

@Nullable
public static Class<?>[] parameterInfoToTypes(@Nullable
 MBeanParameterInfo[] paramInfo,
 @Nullable
 ClassLoader classLoader)
                                       throws ClassNotFoundException

Convert an array of MBeanParameterInfo into an array of Class instances corresponding to the parameters.

Parameters:

paramInfo - the JMX parameter info

classLoader - the ClassLoader to use for loading parameter types

Returns:

the parameter types as classes

Throws:

ClassNotFoundException - if a parameter type could not be resolved

getMethodSignature

public static String[] getMethodSignature(Method method)

Create a String[] representing the argument signature of a method. Each element in the array is the fully qualified class name of the corresponding argument in the methods signature.

Parameters:

method - the method to build an argument signature for

Returns:

the signature as array of argument types

getAttributeName

public static String getAttributeName(PropertyDescriptor property,
 boolean useStrictCasing)

Return the JMX attribute name to use for the given JavaBeans property.

When using strict casing, a JavaBean property with a getter method such as getFoo() translates to an attribute called Foo. With strict casing disabled, getFoo() would translate to just foo.

Parameters:

property - the JavaBeans property descriptor

useStrictCasing - whether to use strict casing

Returns:

the JMX attribute name to use

appendIdentityToObjectName

public static ObjectName appendIdentityToObjectName(ObjectName objectName,
 Object managedResource)
                                             throws MalformedObjectNameException

Append an additional key/value pair to an existing ObjectName with the key being the static value identity and the value being the identity hash code of the managed resource being exposed on the supplied ObjectName. This can be used to provide a unique ObjectName for each distinct instance of a particular bean or class. Useful when generating ObjectNames at runtime for a set of managed resources based on the template value supplied by a ObjectNamingStrategy.

Parameters:

objectName - the original JMX ObjectName

managedResource - the MBean instance

Returns:

an ObjectName with the MBean identity added

Throws:

MalformedObjectNameException - in case of an invalid object name specification

See Also:

• ObjectUtils.getIdentityHexString(Object)

getClassToExpose

public static Class<?> getClassToExpose(Object managedBean)

Return the class or interface to expose for the given bean. This is the class that will be searched for attributes and operations (for example, checked for annotations).

This implementation returns the superclass for a CGLIB proxy and the class of the given bean else (for a JDK proxy or a plain bean class).

Parameters:

managedBean - the bean instance (might be an AOP proxy)

Returns:

the bean class to expose

See Also:

• ClassUtils.getUserClass(Object)

getClassToExpose

public static Class<?> getClassToExpose(Class<?> clazz)

Return the class or interface to expose for the given bean class. This is the class that will be searched for attributes and operations (for example, checked for annotations).

This implementation returns the superclass for a CGLIB proxy and the class of the given bean else (for a JDK proxy or a plain bean class).

Parameters:

clazz - the bean class (might be an AOP proxy class)

Returns:

the bean class to expose

See Also:

• ClassUtils.getUserClass(Class)

isMBean

public static boolean isMBean(@Nullable
 Class<?> clazz)

Determine whether the given bean class qualifies as an MBean as-is.

This implementation checks for DynamicMBean classes as well as classes with corresponding "*MBean" interface (Standard MBeans) or corresponding "*MXBean" interface (Java 6 MXBeans).

Parameters:

clazz - the bean class to analyze

Returns:

whether the class qualifies as an MBean

See Also:

• MBeanExporter.isMBean(Class)

getMBeanInterface

@Nullable
public static Class<?> getMBeanInterface(@Nullable
 Class<?> clazz)

Return the Standard MBean interface for the given class, if any (that is, an interface whose name matches the class name of the given class but with suffix "MBean").

Parameters:

clazz - the class to check

Returns:

the Standard MBean interface for the given class

getMXBeanInterface

@Nullable
public static Class<?> getMXBeanInterface(@Nullable
 Class<?> clazz)

Return the Java 6 MXBean interface exists for the given class, if any (that is, an interface whose name ends with "MXBean" and/or carries an appropriate MXBean annotation).

Parameters:

clazz - the class to check

Returns:

whether there is an MXBean interface for the given class