org.springframework.jmx.access
Class MBeanClientInterceptor

java.lang.Object
  org.springframework.jmx.access.MBeanClientInterceptor

All Implemented Interfaces:

Advice, Interceptor, MethodInterceptor, BeanClassLoaderAware, DisposableBean, InitializingBean

Direct Known Subclasses:

MBeanProxyFactoryBean

public class MBeanClientInterceptor
extends Object
implements MethodInterceptor, BeanClassLoaderAware, InitializingBean, DisposableBean

MethodInterceptor that routes calls to an MBean running on the supplied MBeanServerConnection. Works for both local and remote MBeanServerConnections.

By default, the MBeanClientInterceptor will connect to the MBeanServer and cache MBean metadata at startup. This can be undesirable when running against a remote MBeanServer that may not be running when the application starts. Through setting the connectOnStartup property to "false", you can defer this process until the first invocation against the proxy.

Requires JMX 1.2's MBeanServerConnection feature. As a consequence, this class will not work on JMX 1.0.

This functionality is usually used through MBeanProxyFactoryBean. See the javadoc of that class for more information.

Since:

1.2

Author:

Rob Harrop, Juergen Hoeller

See Also:

MBeanProxyFactoryBean, setConnectOnStartup(boolean)

Field Summary

protected Log

logger Logger available to subclasses

Constructor Summary

MBeanClientInterceptor()

Method Summary

void	afterPropertiesSet() Prepares the MBeanServerConnection if the "connectOnStartup" is turned on (which it is by default).
protected Object	convertResultValueIfNecessary(Object result, Class targetClass) Convert the given result object (from attribute access or operation invocation) to the specified target class for returning from the proxy method.
void	destroy() Closes any JMXConnector that may be managed by this interceptor.
protected Class	getManagementInterface() Return the management interface of the target MBean, or null if none specified.
Object	invoke(MethodInvocation invocation) Route the invocation to the configured managed resource.
protected boolean	isPrepared() Return whether this client interceptor has already been prepared, i.e. has already looked up the server and cached all metadata.
protected MBeanServer	locateMBeanServer(String agentId) Attempt to locate an existing MBeanServer.
void	prepare() Ensures that an MBeanServerConnection is configured and attempts to detect a local connection if one is not supplied.
void	setAgentId(String agentId) Set the agent id of the MBeanServer to locate.
void	setBeanClassLoader(ClassLoader beanClassLoader) Callback that supplies the bean class loader to a bean instance.
void	setConnectOnStartup(boolean connectOnStartup) Set whether or not the proxy should connect to the MBeanServer at creation time ("true") or the first time it is invoked ("false").
void	setManagementInterface(Class managementInterface) Set the management interface of the target MBean, exposing bean property setters and getters for MBean attributes and conventional Java methods for MBean operations.
void	setObjectName(Object objectName) Set the ObjectName of the MBean which calls are routed to, as ObjectName instance or as String.
void	setServer(MBeanServerConnection server) Set the MBeanServerConnection used to connect to the MBean which all invocations are routed to.
void	setServiceUrl(String url) Set the service URL of the remote MBeanServer.
void	setUseStrictCasing(boolean useStrictCasing) Set whether to use strict casing for attributes.

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected final Log logger

Logger available to subclasses

Constructor Detail

MBeanClientInterceptor

public MBeanClientInterceptor()

Method Detail

setServer

public void setServer(MBeanServerConnection server)

Set the MBeanServerConnection used to connect to the MBean which all invocations are routed to.

setServiceUrl

public void setServiceUrl(String url)
                   throws MalformedURLException

Set the service URL of the remote MBeanServer.

Throws:

MalformedURLException

setAgentId

public void setAgentId(String agentId)

Set the agent id of the MBeanServer to locate.

Default is none. If specified, this will result in an attempt being made to locate the attendant MBeanServer, unless the "serviceUrl" property has been set.

See Also:

MBeanServerFactory.findMBeanServer(String)

setConnectOnStartup

public void setConnectOnStartup(boolean connectOnStartup)

Set whether or not the proxy should connect to the MBeanServer at creation time ("true") or the first time it is invoked ("false"). Default is "true".

setObjectName

public void setObjectName(Object objectName)
                   throws MalformedObjectNameException

Set the ObjectName of the MBean which calls are routed to, as ObjectName instance or as String.

Throws:

MalformedObjectNameException

setUseStrictCasing

public void setUseStrictCasing(boolean useStrictCasing)

Set whether to use strict casing for attributes. Enabled by default.

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

setManagementInterface

public void setManagementInterface(Class managementInterface)

Set the management interface of the target MBean, exposing bean property setters and getters for MBean attributes and conventional Java methods for MBean operations.

getManagementInterface

protected final Class getManagementInterface()

Return the management interface of the target MBean, or null if none specified.

setBeanClassLoader

public void setBeanClassLoader(ClassLoader beanClassLoader)

Description copied from interface: BeanClassLoaderAware

Callback that supplies the bean class loader to a bean instance.

Invoked after the population of normal bean properties but before an initialization callback such as InitializingBean's InitializingBean.afterPropertiesSet() method or a custom init-method.

Specified by:

setBeanClassLoader in interface BeanClassLoaderAware

Parameters:

beanClassLoader - the owning class loader; may be null in which case a default ClassLoader must be used, for example the ClassLoader obtained via ClassUtils.getDefaultClassLoader()

afterPropertiesSet

public void afterPropertiesSet()

Prepares the MBeanServerConnection if the "connectOnStartup" is turned on (which it is by default).

Specified by:

afterPropertiesSet in interface InitializingBean

prepare

public void prepare()

Ensures that an MBeanServerConnection is configured and attempts to detect a local connection if one is not supplied.

locateMBeanServer

protected MBeanServer locateMBeanServer(String agentId)
                                 throws MBeanServerNotFoundException

Attempt to locate an existing MBeanServer. Called if no "serviceUrl" was specified.

The default implementation attempts to find an MBeanServer using a standard lookup. Subclasses may override to add additional location logic.

Parameters:

agentId - the agent identifier of the MBeanServer to retrieve. If this parameter is null, all registered MBeanServers are considered.

Returns:

the MBeanServer if found

Throws:

MBeanServerNotFoundException - if no MBeanServer could be found

See Also:

JmxUtils.locateMBeanServer(String), MBeanServerFactory.findMBeanServer(String)

isPrepared

protected boolean isPrepared()

Return whether this client interceptor has already been prepared, i.e. has already looked up the server and cached all metadata.

invoke

public Object invoke(MethodInvocation invocation)
              throws Throwable

Route the invocation to the configured managed resource. Correctly routes JavaBean property access to MBeanServerConnection.get/setAttribute and method invocation to MBeanServerConnection.invoke. Any attempt to invoke a method that does not correspond to an attribute or operation defined in the management interface of the managed resource results in an InvalidInvocationException.

Specified by:

invoke in interface MethodInterceptor

Parameters:

invocation - the MethodInvocation to re-route.

Returns:

the value returned as a result of the re-routed invocation.

Throws:

InvocationFailureException - if the invocation does not match an attribute or operation on the management interface of the resource.

Throwable - typically as the result of an error during invocation

convertResultValueIfNecessary

protected Object convertResultValueIfNecessary(Object result,
                                               Class targetClass)

Convert the given result object (from attribute access or operation invocation) to the specified target class for returning from the proxy method.

Parameters:

result - the result object as returned by the MBeanServer

targetClass - the result type of the proxy method that's been invoked

Returns:

the converted result object, or the passed-in object if no conversion is necessary

destroy

public void destroy()
             throws Exception

Closes any JMXConnector that may be managed by this interceptor.

Specified by:

destroy in interface DisposableBean

Throws:

Exception - in case of shutdown errors. Exceptions will get logged but not rethrown to allow other beans to release their resources too.