public abstract class AbstractAutoProxyCreator extends ProxyConfig implements SmartInstantiationAwareBeanPostProcessor, BeanClassLoaderAware, BeanFactoryAware, Ordered, AopInfrastructureBean
BeanPostProcessor
implementation
that wraps each eligible bean with an AOP proxy, delegating to specified interceptors
before invoking the bean itself.
This class distinguishes between "common" interceptors: shared for all proxies it creates, and "specific" interceptors: unique per bean instance. There need not be any common interceptors. If there are, they are set using the interceptorNames property. As with ProxyFactoryBean, interceptors names in the current factory are used rather than bean references to allow correct handling of prototype advisors and interceptors: for example, to support stateful mixins. Any advice type is supported for "interceptorNames" entries.
Such auto-proxying is particularly useful if there's a large number of beans that need to be wrapped with similar proxies, i.e. delegating to the same interceptors. Instead of x repetitive proxy definitions for x target beans, you can register one single such post processor with the bean factory to achieve the same effect.
Subclasses can apply any strategy to decide if a bean is to be proxied, e.g. by type, by name, by definition details, etc. They can also return additional interceptors that should just be applied to the specific bean instance. The default concrete implementation is BeanNameAutoProxyCreator, identifying the beans to be proxied via a list of bean names.
Any number of TargetSourceCreator
implementations can be used to create
a custom target source - for example, to pool prototype objects. Auto-proxying will
occur even if there is no advice, as long as a TargetSourceCreator specifies a custom
TargetSource
. If there are no TargetSourceCreators set,
or if none matches, a SingletonTargetSource
will be used by default to wrap the target bean instance.
setInterceptorNames(java.lang.String[])
,
getAdvicesAndAdvisorsForBean(java.lang.Class<?>, java.lang.String, org.springframework.aop.TargetSource)
,
BeanNameAutoProxyCreator
,
DefaultAdvisorAutoProxyCreator
,
Serialized FormModifier and Type | Field and Description |
---|---|
protected static Object[] |
DO_NOT_PROXY
Convenience constant for subclasses: Return value for "do not proxy".
|
protected Log |
logger
Logger available to subclasses
|
protected static Object[] |
PROXY_WITHOUT_ADDITIONAL_INTERCEPTORS
Convenience constant for subclasses: Return value for
"proxy without additional interceptors, just the common ones".
|
HIGHEST_PRECEDENCE, LOWEST_PRECEDENCE
Constructor and Description |
---|
AbstractAutoProxyCreator() |
Modifier and Type | Method and Description |
---|---|
protected boolean |
advisorsPreFiltered()
Return whether the Advisors returned by the subclass are pre-filtered
to match the bean's target class already, allowing the ClassFilter check
to be skipped when building advisors chains for AOP invocations.
|
protected Advisor[] |
buildAdvisors(String beanName,
Object[] specificInterceptors)
Determine the advisors for the given bean, including the specific interceptors
as well as the common interceptor, all adapted to the Advisor interface.
|
protected Object |
createProxy(Class<?> beanClass,
String beanName,
Object[] specificInterceptors,
TargetSource targetSource)
Create an AOP proxy for the given bean.
|
protected void |
customizeProxyFactory(ProxyFactory proxyFactory)
Subclasses may choose to implement this: for example,
to change the interfaces exposed.
|
Constructor<?>[] |
determineCandidateConstructors(Class<?> beanClass,
String beanName)
Determine the candidate constructors to use for the given bean.
|
protected abstract Object[] |
getAdvicesAndAdvisorsForBean(Class<?> beanClass,
String beanName,
TargetSource customTargetSource)
Return whether the given bean is to be proxied, what additional
advices (e.g.
|
protected BeanFactory |
getBeanFactory()
Return the owning BeanFactory.
|
protected Object |
getCacheKey(Class<?> beanClass,
String beanName)
Build a cache key for the given bean class and bean name.
|
protected TargetSource |
getCustomTargetSource(Class<?> beanClass,
String beanName)
Create a target source for bean instances.
|
Object |
getEarlyBeanReference(Object bean,
String beanName)
Obtain a reference for early access to the specified bean,
typically for the purpose of resolving a circular reference.
|
int |
getOrder()
Return the order value of this object, with a
higher value meaning greater in terms of sorting.
|
boolean |
isFrozen()
Return whether the config is frozen, and no advice changes can be made.
|
protected boolean |
isInfrastructureClass(Class<?> beanClass)
Return whether the given bean class represents an infrastructure class
that should never be proxied.
|
Object |
postProcessAfterInitialization(Object bean,
String beanName)
Create a proxy with the configured interceptors if the bean is
identified as one to proxy by the subclass.
|
boolean |
postProcessAfterInstantiation(Object bean,
String beanName)
Perform operations after the bean has been instantiated, via a constructor or factory method,
but before Spring property population (from explicit properties or autowiring) occurs.
|
Object |
postProcessBeforeInitialization(Object bean,
String beanName)
Apply this BeanPostProcessor to the given new bean instance before any bean
initialization callbacks (like InitializingBean's
afterPropertiesSet
or a custom init-method). |
Object |
postProcessBeforeInstantiation(Class<?> beanClass,
String beanName)
Apply this BeanPostProcessor before the target bean gets instantiated.
|
PropertyValues |
postProcessPropertyValues(PropertyValues pvs,
PropertyDescriptor[] pds,
Object bean,
String beanName)
Post-process the given property values before the factory applies them
to the given bean.
|
Class<?> |
predictBeanType(Class<?> beanClass,
String beanName)
Predict the type of the bean to be eventually returned from this
processor's
InstantiationAwareBeanPostProcessor.postProcessBeforeInstantiation(java.lang.Class<?>, java.lang.String) callback. |
void |
setAdvisorAdapterRegistry(AdvisorAdapterRegistry advisorAdapterRegistry)
Specify the AdvisorAdapterRegistry to use.
|
void |
setApplyCommonInterceptorsFirst(boolean applyCommonInterceptorsFirst)
Set whether the common interceptors should be applied before bean-specific ones.
|
void |
setBeanClassLoader(ClassLoader classLoader)
Callback that supplies the bean
class loader to
a bean instance. |
void |
setBeanFactory(BeanFactory beanFactory)
Callback that supplies the owning factory to a bean instance.
|
void |
setCustomTargetSourceCreators(TargetSourceCreator[] targetSourceCreators)
Set custom TargetSourceCreators to be applied in this order.
|
void |
setFrozen(boolean frozen)
Set whether or not the proxy should be frozen, preventing advice
from being added to it once it is created.
|
void |
setInterceptorNames(String[] interceptorNames)
Set the common interceptors.
|
void |
setOrder(int order)
Set the ordering which will apply to this class's implementation
of Ordered, used when applying multiple BeanPostProcessors.
|
void |
setProxyClassLoader(ClassLoader classLoader)
Set the ClassLoader to generate the proxy class in.
|
protected boolean |
shouldProxyTargetClass(Class<?> beanClass,
String beanName)
Determine whether the given bean should be proxied with its target
class rather than its interfaces.
|
protected boolean |
shouldSkip(Class<?> beanClass,
String beanName)
Subclasses should override this method to return
true if the
given bean should not be considered for auto-proxying by this post-processor. |
protected Object |
wrapIfNecessary(Object bean,
String beanName,
Object cacheKey)
Wrap the given bean if necessary, i.e.
|
copyFrom, isExposeProxy, isOpaque, isOptimize, isProxyTargetClass, setExposeProxy, setOpaque, setOptimize, setProxyTargetClass, toString
protected static final Object[] DO_NOT_PROXY
protected static final Object[] PROXY_WITHOUT_ADDITIONAL_INTERCEPTORS
protected final Log logger
public final void setOrder(int order)
Default value is Integer.MAX_VALUE
, meaning that it's non-ordered.
order
- ordering valuepublic final int getOrder()
Ordered
Normally starting with 0, with Integer.MAX_VALUE
indicating the greatest value. Same order values will result
in arbitrary positions for the affected objects.
Higher values can be interpreted as lower priority. As a consequence, the object with the lowest value has highest priority (somewhat analogous to Servlet "load-on-startup" values).
public void setFrozen(boolean frozen)
Overridden from the super class to prevent the proxy configuration from being frozen before the proxy is created.
setFrozen
in class ProxyConfig
public boolean isFrozen()
ProxyConfig
isFrozen
in class ProxyConfig
public void setAdvisorAdapterRegistry(AdvisorAdapterRegistry advisorAdapterRegistry)
GlobalAdvisorAdapterRegistry
public void setCustomTargetSourceCreators(TargetSourceCreator[] targetSourceCreators)
Note that TargetSourceCreators will kick in even for target beans where no advices or advisors have been found. If a TargetSourceCreator returns a TargetSource for a specific bean, that bean will be proxied in any case.
TargetSourceCreators can only be invoked if this post processor is used in a BeanFactory, and its BeanFactoryAware callback is used.
targetSourceCreators
- list of TargetSourceCreator.
Ordering is significant: The TargetSource returned from the first matching
TargetSourceCreator (that is, the first that returns non-null) will be used.public void setInterceptorNames(String[] interceptorNames)
If this property isn't set, there will be zero common interceptors. This is perfectly valid, if "specific" interceptors such as matching Advisors are all we want.
public void setApplyCommonInterceptorsFirst(boolean applyCommonInterceptorsFirst)
public void setProxyClassLoader(ClassLoader classLoader)
Default is the bean ClassLoader, i.e. the ClassLoader used by the containing BeanFactory for loading all bean classes. This can be overridden here for specific proxies.
public void setBeanClassLoader(ClassLoader classLoader)
BeanClassLoaderAware
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.
setBeanClassLoader
in interface BeanClassLoaderAware
classLoader
- the owning class loader; may be null
in
which case a default ClassLoader
must be used, for example
the ClassLoader
obtained via
ClassUtils.getDefaultClassLoader()
public void setBeanFactory(BeanFactory beanFactory)
BeanFactoryAware
Invoked after the population of normal bean properties
but before an initialization callback such as
InitializingBean.afterPropertiesSet()
or a custom init-method.
setBeanFactory
in interface BeanFactoryAware
beanFactory
- owning BeanFactory (never null
).
The bean can immediately call methods on the factory.BeanInitializationException
protected BeanFactory getBeanFactory()
null
, as this object doesn't need to belong to a bean factory.public Class<?> predictBeanType(Class<?> beanClass, String beanName)
SmartInstantiationAwareBeanPostProcessor
InstantiationAwareBeanPostProcessor.postProcessBeforeInstantiation(java.lang.Class<?>, java.lang.String)
callback.predictBeanType
in interface SmartInstantiationAwareBeanPostProcessor
beanClass
- the raw class of the beanbeanName
- the name of the beannull
if not predictablepublic Constructor<?>[] determineCandidateConstructors(Class<?> beanClass, String beanName) throws BeansException
SmartInstantiationAwareBeanPostProcessor
determineCandidateConstructors
in interface SmartInstantiationAwareBeanPostProcessor
beanClass
- the raw class of the bean (never null
)beanName
- the name of the beannull
if none specifiedBeansException
- in case of errorspublic Object getEarlyBeanReference(Object bean, String beanName) throws BeansException
SmartInstantiationAwareBeanPostProcessor
This callback gives post-processors a chance to expose a wrapper
early - that is, before the target bean instance is fully initialized.
The exposed object should be equivalent to the what
BeanPostProcessor.postProcessBeforeInitialization(java.lang.Object, java.lang.String)
/ BeanPostProcessor.postProcessAfterInitialization(java.lang.Object, java.lang.String)
would expose otherwise. Note that the object returned by this method will
be used as bean reference unless the post-processor returns a different
wrapper from said post-process callbacks. In other words: Those post-process
callbacks may either eventually expose the same reference or alternatively
return the raw bean instance from those subsequent callbacks (if the wrapper
for the affected bean has been built for a call to this method already,
it will be exposes as final bean reference by default).
getEarlyBeanReference
in interface SmartInstantiationAwareBeanPostProcessor
bean
- the raw bean instancebeanName
- the name of the beanBeansException
- in case of errorspublic Object postProcessBeforeInstantiation(Class<?> beanClass, String beanName) throws BeansException
InstantiationAwareBeanPostProcessor
If a non-null object is returned by this method, the bean creation process
will be short-circuited. The only further processing applied is the
BeanPostProcessor.postProcessAfterInitialization(java.lang.Object, java.lang.String)
callback from the configured
BeanPostProcessors
.
This callback will only be applied to bean definitions with a bean class. In particular, it will not be applied to beans with a "factory-method".
Post-processors may implement the extended
SmartInstantiationAwareBeanPostProcessor
interface in order
to predict the type of the bean object that they are going to return here.
postProcessBeforeInstantiation
in interface InstantiationAwareBeanPostProcessor
beanClass
- the class of the bean to be instantiatedbeanName
- the name of the beannull
to proceed with default instantiationBeansException
- in case of errorsAbstractBeanDefinition.hasBeanClass()
,
AbstractBeanDefinition.getFactoryMethodName()
public boolean postProcessAfterInstantiation(Object bean, String beanName)
InstantiationAwareBeanPostProcessor
This is the ideal callback for performing field injection on the given bean instance.
See Spring's own AutowiredAnnotationBeanPostProcessor
for a typical example.
postProcessAfterInstantiation
in interface InstantiationAwareBeanPostProcessor
bean
- the bean instance created, with properties not having been set yetbeanName
- the name of the beantrue
if properties should be set on the bean; false
if property population should be skipped. Normal implementations should return true
.
Returning false
will also prevent any subsequent InstantiationAwareBeanPostProcessor
instances being invoked on this bean instance.public PropertyValues postProcessPropertyValues(PropertyValues pvs, PropertyDescriptor[] pds, Object bean, String beanName)
InstantiationAwareBeanPostProcessor
Also allows for replacing the property values to apply, typically through creating a new MutablePropertyValues instance based on the original PropertyValues, adding or removing specific values.
postProcessPropertyValues
in interface InstantiationAwareBeanPostProcessor
pvs
- the property values that the factory is about to apply (never null
)pds
- the relevant property descriptors for the target bean (with ignored
dependency types - which the factory handles specifically - already filtered out)bean
- the bean instance created, but whose properties have not yet been setbeanName
- the name of the beannull
to skip property populationMutablePropertyValues
public Object postProcessBeforeInitialization(Object bean, String beanName)
BeanPostProcessor
afterPropertiesSet
or a custom init-method). The bean will already be populated with property values.
The returned bean instance may be a wrapper around the original.postProcessBeforeInitialization
in interface BeanPostProcessor
bean
- the new bean instancebeanName
- the name of the beannull
, no subsequent BeanPostProcessors will be invokedInitializingBean.afterPropertiesSet()
public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException
postProcessAfterInitialization
in interface BeanPostProcessor
bean
- the new bean instancebeanName
- the name of the beannull
, no subsequent BeanPostProcessors will be invokedBeansException
- in case of errorsgetAdvicesAndAdvisorsForBean(java.lang.Class<?>, java.lang.String, org.springframework.aop.TargetSource)
protected Object getCacheKey(Class<?> beanClass, String beanName)
beanClass
- the bean classbeanName
- the bean nameprotected Object wrapIfNecessary(Object bean, String beanName, Object cacheKey)
bean
- the raw bean instancebeanName
- the name of the beancacheKey
- the cache key for metadata accessprotected boolean isInfrastructureClass(Class<?> beanClass)
The default implementation considers Advices, Advisors and AopInfrastructureBeans as infrastructure classes.
beanClass
- the class of the beanAdvice
,
Advisor
,
AopInfrastructureBean
,
shouldSkip(java.lang.Class<?>, java.lang.String)
protected boolean shouldSkip(Class<?> beanClass, String beanName)
true
if the
given bean should not be considered for auto-proxying by this post-processor.
Sometimes we need to be able to avoid this happening if it will lead to
a circular reference. This implementation returns false
.
beanClass
- the class of the beanbeanName
- the name of the beanprotected TargetSource getCustomTargetSource(Class<?> beanClass, String beanName)
null
if no custom TargetSource should be used.
This implementation uses the "customTargetSourceCreators" property. Subclasses can override this method to use a different mechanism.
beanClass
- the class of the bean to create a TargetSource forbeanName
- the name of the beansetCustomTargetSourceCreators(org.springframework.aop.framework.autoproxy.TargetSourceCreator[])
protected Object createProxy(Class<?> beanClass, String beanName, Object[] specificInterceptors, TargetSource targetSource)
beanClass
- the class of the beanbeanName
- the name of the beanspecificInterceptors
- the set of interceptors that is
specific to this bean (may be empty, but not null)targetSource
- the TargetSource for the proxy,
already pre-configured to access the beanbuildAdvisors(java.lang.String, java.lang.Object[])
protected boolean shouldProxyTargetClass(Class<?> beanClass, String beanName)
"proxyTargetClass" setting
as well as the
"preserveTargetClass" attribute
of the corresponding bean definition.beanClass
- the class of the beanbeanName
- the name of the beanAutoProxyUtils.shouldProxyTargetClass(org.springframework.beans.factory.config.ConfigurableListableBeanFactory, java.lang.String)
protected boolean advisorsPreFiltered()
Default is false
. Subclasses may override this if they
will always return pre-filtered Advisors.
getAdvicesAndAdvisorsForBean(java.lang.Class<?>, java.lang.String, org.springframework.aop.TargetSource)
,
Advised.setPreFiltered(boolean)
protected Advisor[] buildAdvisors(String beanName, Object[] specificInterceptors)
beanName
- the name of the beanspecificInterceptors
- the set of interceptors that is
specific to this bean (may be empty, but not null)protected void customizeProxyFactory(ProxyFactory proxyFactory)
The default implementation is empty.
proxyFactory
- ProxyFactory that is already configured with
TargetSource and interfaces and will be used to create the proxy
immediably after this method returnsprotected abstract Object[] getAdvicesAndAdvisorsForBean(Class<?> beanClass, String beanName, TargetSource customTargetSource) throws BeansException
beanClass
- the class of the bean to advisebeanName
- the name of the beancustomTargetSource
- the TargetSource returned by the
getCustomTargetSource(java.lang.Class<?>, java.lang.String)
method: may be ignored.
Will be null
if no custom target source is in use.null
if no proxy at all, not even with the common interceptors.
See constants DO_NOT_PROXY and PROXY_WITHOUT_ADDITIONAL_INTERCEPTORS.BeansException
- in case of errorsDO_NOT_PROXY
,
PROXY_WITHOUT_ADDITIONAL_INTERCEPTORS