org.springframework.aop.framework
Class ProxyFactoryBean

java.lang.Object
  org.springframework.aop.framework.ProxyConfig
      org.springframework.aop.framework.AdvisedSupport
          org.springframework.aop.framework.ProxyFactoryBean

All Implemented Interfaces:

Advised, AdvisedSupportListener, BeanFactoryAware, FactoryBean

public class ProxyFactoryBean

extends AdvisedSupport

implements FactoryBean, BeanFactoryAware, AdvisedSupportListener

FactoryBean implementation for use to source AOP proxies from a Spring BeanFactory.

Interceptors and Advisors are identified by a list of bean names in the current bean factory. These beans should be of type Interceptor or an Advisor subtype (presently InterceptionAroundAdvisor or InterceptionIntroductionAdvisor). The last entry in the list can be the name of any bean in the factory. If it's neither an Interceptor nor a MethodPointcut, a new InvokerInterceptor is added to wrap it.

Global interceptors and advisors can be added at the factory level. The specified ones are expanded in an interceptor list where an "xxx*" entry is included in the list, matching the given prefix with the bean names (e.g. "global*" would match both "globalBean1" and "globalBean2", "*" all defined interceptors). The matching interceptors get applied according to their returned order value, if they implement the Ordered interface. An interceptor name list may not conclude with a global "xxx*" pattern, as global interceptors cannot invoke targets.

Creates a J2SE proxy when proxy interfaces are given, a CGLIB proxy for the actual target class if not. Note that the latter will only work if the target class does not have final methods, as a dynamic subclass will be created at runtime.

It's possible to cast a proxy obtained from this factory to Advisor, or to obtain the ProxyFactoryBean reference and programmatically manipulate it. This won't work for existing prototype references, which are independent. However, it will work for prototypes subsequently obtained from the factory. Changes to interception will work immediately on singletons (including existing references). However, to change interfaces or target it's necessary to obtain a new instance from the factory. This means that singleton instances obtained from the factory do not have the same object identity. However, they do have the same interceptors and target, and changing any reference will change all objects.

Version:

$Id: ProxyFactoryBean.java,v 1.23 2004/03/19 21:35:54 johnsonr Exp $

Author:

Rod Johnson, Juergen Hoeller

See Also:

setInterceptorNames(java.lang.String[]), setProxyInterfaces(java.lang.String[]), MethodInterceptor

Field Summary

static java.lang.String

GLOBAL_SUFFIX This suffix in a value in an interceptor list indicates to expand globals.

Fields inherited from class org.springframework.aop.framework.AdvisedSupport

advisorChainFactory, EMPTY_TARGET_SOURCE, targetSource

Fields inherited from class org.springframework.aop.framework.ProxyConfig

exposeProxy, logger

Constructor Summary

ProxyFactoryBean()

Method Summary

void	activated(AdvisedSupport advisedSupport) Invoked when first proxy is created
void	adviceChanged(AdvisedSupport advisedSupport) Blow away and recache singleton to allow for advice changes.
java.lang.Object	getObject() Return a proxy.
java.lang.Class	getObjectType() Return the type of object that this FactoryBean creates, or null if not known in advance.
boolean	isSingleton() Is the bean managed by this factory a singleton or a prototype? That is, will getObject() always return the same object?
void	setBeanFactory(BeanFactory beanFactory) Callback that supplies the owning factory to a bean instance.
void	setInterceptorNames(java.lang.String[] interceptorNames) Set the list of Interceptor/Advisor bean names.
void	setProxyInterfaces(java.lang.String[] interfaceNames) Set the names of the interfaces we're proxying.
void	setSingleton(boolean singleton) Set the value of the singleton property.

Methods inherited from class org.springframework.aop.framework.AdvisedSupport

addAdvisor, addAdvisor, addAdvisor, addBeforeAdvice, addInterceptor, addInterceptor, addInterface, addListener, addThrowsAdvice, copyConfigurationFrom, countInterceptorsOfType, createAopProxy, getAdvisorChainFactory, getAdvisors, getMethodInvocationFactory, getProxiedInterfaces, getTargetSource, indexOf, indexOf, interceptorIncluded, isActive, isInterfaceProxied, removeAdvisor, removeAdvisor, removeInterceptor, removeInterface, removeListener, replaceAdvisor, setAdvisorChainFactory, setInterfaces, setMethodInvocationFactory, setTarget, setTargetSource, toProxyConfigString, toString

Methods inherited from class org.springframework.aop.framework.ProxyConfig

copyFrom, getAopProxyFactory, getExposeProxy, getOptimize, getProxyTargetClass, isFrozen, setAopProxyFactory, setExposeProxy, setFrozen, setOptimize, setProxyTargetClass

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.springframework.aop.framework.Advised

getExposeProxy, getProxyTargetClass, isFrozen

Field Detail

GLOBAL_SUFFIX

public static final java.lang.String GLOBAL_SUFFIX

This suffix in a value in an interceptor list indicates to expand globals.

See Also:

Constant Field Values

Constructor Detail

ProxyFactoryBean

public ProxyFactoryBean()

Method Detail

setProxyInterfaces

public void setProxyInterfaces(java.lang.String[] interfaceNames)
                        throws org.aopalliance.aop.AspectException,
                               java.lang.ClassNotFoundException

Set the names of the interfaces we're proxying. If no interface is given, a CGLIB for the actual class will be created.

Throws:

org.aopalliance.aop.AspectException

java.lang.ClassNotFoundException

setInterceptorNames

public void setInterceptorNames(java.lang.String[] interceptorNames)

Set the list of Interceptor/Advisor bean names. This must always be set to use this factory bean in a bean factory.

setSingleton

public void setSingleton(boolean singleton)

Set the value of the singleton property. Governs whether this factory should always return the same proxy instance (which implies the same target) or whether it should return a new prototype instance, which implies that the target and interceptors may be new instances also, if they are obtained from prototype bean definitions. This allows for fine control of independence/uniqueness in the object graph.

Parameters:

singleton -

setBeanFactory

public void setBeanFactory(BeanFactory beanFactory)
                    throws BeansException

Description copied from interface: BeanFactoryAware

Callback that supplies the owning factory to a bean instance.

Invoked after population of normal bean properties but before an init callback like InitializingBean's afterPropertiesSet or a custom init-method.

Specified by:

setBeanFactory in interface BeanFactoryAware

Parameters:

beanFactory - owning BeanFactory (may not be null). The bean can immediately call methods on the factory.

Throws:

BeansException - in case of initialization errors

See Also:

BeanInitializationException

getObject

public java.lang.Object getObject()
                           throws BeansException

Return a proxy. Invoked when clients obtain beans from this factory bean. Create an instance of the AOP proxy to be returned by this factory. The instance will be cached for a singleton, and create on each call to getObject() for a proxy.

Specified by:

getObject in interface FactoryBean

Returns:

Object a fresh AOP proxy reflecting the current state of this factory

Throws:

BeansException

See Also:

FactoryBean.getObject()

getObjectType

public java.lang.Class getObjectType()

Description copied from interface: FactoryBean

Return the type of object that this FactoryBean creates, or null if not known in advance. This allows to check for specific types of beans without instantiating objects, e.g. on autowiring.

For a singleton, this can simply return getObject().getClass(), or even null, as autowiring will always check the actual objects for singletons. For prototypes, returning a meaningful type here is highly advisable, as autowiring will simply ignore them else.

Specified by:

getObjectType in interface FactoryBean

Returns:

the type of object that this FactoryBean creates, or null

See Also:

ListableBeanFactory.getBeansOfType(java.lang.Class, boolean, boolean)

isSingleton

public boolean isSingleton()

Description copied from interface: FactoryBean

Is the bean managed by this factory a singleton or a prototype? That is, will getObject() always return the same object?

The singleton status of the FactoryBean itself will generally be provided by the owning BeanFactory.

Specified by:

isSingleton in interface FactoryBean

Returns:

if this bean is a singleton

activated

public void activated(AdvisedSupport advisedSupport)

Description copied from interface: AdvisedSupportListener

Invoked when first proxy is created

Specified by:

activated in interface AdvisedSupportListener

Parameters:

advisedSupport -

See Also:

AdvisedSupportListener.activated(org.springframework.aop.framework.AdvisedSupport)

adviceChanged

public void adviceChanged(AdvisedSupport advisedSupport)

Blow away and recache singleton to allow for advice changes.

Specified by:

adviceChanged in interface AdvisedSupportListener

Parameters:

advisedSupport -

See Also:

AdvisedSupportListener.adviceChanged(org.springframework.aop.framework.AdvisedSupport)