org.springframework.aop.framework

Interface Advised

All Superinterfaces:

TargetClassAware

All Known Implementing Classes:

AdvisedSupport, AspectJProxyFactory, ProxyCreatorSupport, ProxyFactory, ProxyFactoryBean

public interface Advised
extends TargetClassAware

Interface to be implemented by classes that hold the configuration of a factory of AOP proxies. This configuration includes the Interceptors and other advice, Advisors, and the proxied interfaces.

Any AOP proxy obtained from Spring can be cast to this interface to allow manipulation of its AOP advice.

Since:

13.03.2003

Author:

Rod Johnson, Juergen Hoeller

See Also:

AdvisedSupport

Method Summary

Modifier and Type	Method and Description
void	addAdvice(Advice advice) Add the given AOP Alliance advice to the tail of the advice (interceptor) chain.
void	addAdvice(int pos, Advice advice) Add the given AOP Alliance Advice at the specified position in the advice chain.
void	addAdvisor(Advisor advisor) Add an advisor at the end of the advisor chain.
void	addAdvisor(int pos, Advisor advisor) Add an Advisor at the specified position in the chain.
Advisor[]	getAdvisors() Return the advisors applying to this proxy.
Class<?>[]	getProxiedInterfaces() Return the interfaces proxied by the AOP proxy.
TargetSource	getTargetSource() Return the TargetSource used by this Advised object.
int	indexOf(Advice advice) Return the index (from 0) of the given AOP Alliance Advice, or -1 if no such advice is an advice for this proxy.
int	indexOf(Advisor advisor) Return the index (from 0) of the given advisor, or -1 if no such advisor applies to this proxy.
boolean	isExposeProxy() Return whether the factory should expose the proxy as a ThreadLocal.
boolean	isFrozen() Return whether the Advised configuration is frozen, in which case no advice changes can be made.
boolean	isInterfaceProxied(Class<?> intf) Determine whether the given interface is proxied.
boolean	isPreFiltered() Return whether this proxy configuration is pre-filtered so that it only contains applicable advisors (matching this proxy's target class).
boolean	isProxyTargetClass() Are we proxying the full target class instead of specified interfaces?
boolean	removeAdvice(Advice advice) Remove the Advisor containing the given advice.
boolean	removeAdvisor(Advisor advisor) Remove the given advisor.
void	removeAdvisor(int index) Remove the advisor at the given index.
boolean	replaceAdvisor(Advisor a, Advisor b) Replace the given advisor.
void	setExposeProxy(boolean exposeProxy) Set whether the proxy should be exposed by the AOP framework as a ThreadLocal for retrieval via the AopContext class.
void	setPreFiltered(boolean preFiltered) Set whether this proxy configuration is pre-filtered so that it only contains applicable advisors (matching this proxy's target class).
void	setTargetSource(TargetSource targetSource) Change the TargetSource used by this Advised object.
String	toProxyConfigString() As toString() will normally be delegated to the target, this returns the equivalent for the AOP proxy.

Methods inherited from interface org.springframework.aop.TargetClassAware

getTargetClass

Method Detail

isFrozen

boolean isFrozen()

Return whether the Advised configuration is frozen, in which case no advice changes can be made.

isProxyTargetClass

boolean isProxyTargetClass()

Are we proxying the full target class instead of specified interfaces?

getProxiedInterfaces

Class<?>[] getProxiedInterfaces()

Return the interfaces proxied by the AOP proxy.

Will not include the target class, which may also be proxied.

isInterfaceProxied

boolean isInterfaceProxied(Class<?> intf)

Determine whether the given interface is proxied.

Parameters:

intf - the interface to check

setTargetSource

void setTargetSource(TargetSource targetSource)

Change the TargetSource used by this Advised object.

Only works if the configuration isn't frozen.

Parameters:

targetSource - new TargetSource to use

getTargetSource

TargetSource getTargetSource()

Return the TargetSource used by this Advised object.

setExposeProxy

void setExposeProxy(boolean exposeProxy)

Set whether the proxy should be exposed by the AOP framework as a ThreadLocal for retrieval via the AopContext class.

It can be necessary to expose the proxy if an advised object needs to invoke a method on itself with advice applied. Otherwise, if an advised object invokes a method on this, no advice will be applied.

Default is false, for optimal performance.

isExposeProxy

boolean isExposeProxy()

Return whether the factory should expose the proxy as a ThreadLocal.

It can be necessary to expose the proxy if an advised object needs to invoke a method on itself with advice applied. Otherwise, if an advised object invokes a method on this, no advice will be applied.

Getting the proxy is analogous to an EJB calling getEJBObject().

See Also:

AopContext

setPreFiltered

void setPreFiltered(boolean preFiltered)

Set whether this proxy configuration is pre-filtered so that it only contains applicable advisors (matching this proxy's target class).

Default is "false". Set this to "true" if the advisors have been pre-filtered already, meaning that the ClassFilter check can be skipped when building the actual advisor chain for proxy invocations.

See Also:

ClassFilter

isPreFiltered

boolean isPreFiltered()

Return whether this proxy configuration is pre-filtered so that it only contains applicable advisors (matching this proxy's target class).

getAdvisors

Advisor[] getAdvisors()

Return the advisors applying to this proxy.

Returns:

a list of Advisors applying to this proxy (never null)

addAdvisor

void addAdvisor(Advisor advisor)
         throws AopConfigException

Add an advisor at the end of the advisor chain.

The Advisor may be an IntroductionAdvisor, in which new interfaces will be available when a proxy is next obtained from the relevant factory.

Parameters:

advisor - the advisor to add to the end of the chain

Throws:

AopConfigException - in case of invalid advice

addAdvisor

void addAdvisor(int pos,
                Advisor advisor)
         throws AopConfigException

Add an Advisor at the specified position in the chain.

Parameters:

advisor - the advisor to add at the specified position in the chain

pos - position in chain (0 is head). Must be valid.

Throws:

AopConfigException - in case of invalid advice

removeAdvisor

boolean removeAdvisor(Advisor advisor)

Remove the given advisor.

Parameters:

advisor - the advisor to remove

Returns:

true if the advisor was removed; false if the advisor was not found and hence could not be removed

removeAdvisor

void removeAdvisor(int index)
            throws AopConfigException

Remove the advisor at the given index.

Parameters:

index - the index of advisor to remove

Throws:

AopConfigException - if the index is invalid

indexOf

int indexOf(Advisor advisor)

Return the index (from 0) of the given advisor, or -1 if no such advisor applies to this proxy.

The return value of this method can be used to index into the advisors array.

Parameters:

advisor - the advisor to search for

Returns:

index from 0 of this advisor, or -1 if there's no such advisor

replaceAdvisor

boolean replaceAdvisor(Advisor a,
                       Advisor b)
                throws AopConfigException

Replace the given advisor.

Note: If the advisor is an IntroductionAdvisor and the replacement is not or implements different interfaces, the proxy will need to be re-obtained or the old interfaces won't be supported and the new interface won't be implemented.

Parameters:

a - the advisor to replace

b - the advisor to replace it with

Returns:

whether it was replaced. If the advisor wasn't found in the list of advisors, this method returns false and does nothing.

Throws:

AopConfigException - in case of invalid advice

addAdvice

void addAdvice(Advice advice)
        throws AopConfigException

Add the given AOP Alliance advice to the tail of the advice (interceptor) chain.

This will be wrapped in a DefaultPointcutAdvisor with a pointcut that always applies, and returned from the getAdvisors() method in this wrapped form.

Note that the given advice will apply to all invocations on the proxy, even to the toString() method! Use appropriate advice implementations or specify appropriate pointcuts to apply to a narrower set of methods.

Parameters:

advice - the advice to add to the tail of the chain

Throws:

AopConfigException - in case of invalid advice

See Also:

addAdvice(int, Advice), DefaultPointcutAdvisor

addAdvice

void addAdvice(int pos,
               Advice advice)
        throws AopConfigException

Add the given AOP Alliance Advice at the specified position in the advice chain.

This will be wrapped in a DefaultPointcutAdvisor with a pointcut that always applies, and returned from the getAdvisors() method in this wrapped form.

Note: The given advice will apply to all invocations on the proxy, even to the toString() method! Use appropriate advice implementations or specify appropriate pointcuts to apply to a narrower set of methods.

Parameters:

pos - index from 0 (head)

advice - the advice to add at the specified position in the advice chain

Throws:

AopConfigException - in case of invalid advice

removeAdvice

boolean removeAdvice(Advice advice)

Remove the Advisor containing the given advice.

Parameters:

advice - the advice to remove

Returns:

true of the advice was found and removed; false if there was no such advice

indexOf

int indexOf(Advice advice)

Return the index (from 0) of the given AOP Alliance Advice, or -1 if no such advice is an advice for this proxy.

The return value of this method can be used to index into the advisors array.

Parameters:

advice - the AOP Alliance advice to search for

Returns:

index from 0 of this advice, or -1 if there's no such advice

toProxyConfigString

String toProxyConfigString()

As toString() will normally be delegated to the target, this returns the equivalent for the AOP proxy.

Returns:

a string description of the proxy configuration