org.springframework.aop.aspectj
Class AbstractAspectJAdvice

java.lang.Object
  org.springframework.aop.aspectj.AbstractAspectJAdvice

All Implemented Interfaces:

Advice, AspectJPrecedenceInformation, Ordered

Direct Known Subclasses:

AspectJAfterAdvice, AspectJAfterReturningAdvice, AspectJAfterThrowingAdvice, AspectJAroundAdvice, AspectJMethodBeforeAdvice

public abstract class AbstractAspectJAdvice
extends Object
implements Advice, AspectJPrecedenceInformation

Base class for AOP Alliance Advice classes wrapping an AspectJ aspect or an AspectJ-annotated advice method.

Since:

2.0

Author:

Rod Johnson, Adrian Colyer, Juergen Hoeller, Ramnivas Laddad

Field Summary

protected Method	aspectJAdviceMethod
protected static String	JOIN_POINT_KEY Key used in ReflectiveMethodInvocation userAtributes map for the current joinpoint.

Fields inherited from interface org.springframework.core.Ordered

HIGHEST_PRECEDENCE, LOWEST_PRECEDENCE

Constructor Summary

AbstractAspectJAdvice(Method aspectJAdviceMethod, AspectJExpressionPointcut pointcut, AspectInstanceFactory aspectInstanceFactory)
Create a new AbstractAspectJAdvice for the given advice method.

Method Summary

protected Object[]	argBinding(org.aspectj.lang.JoinPoint jp, org.aspectj.weaver.tools.JoinPointMatch jpMatch, Object returnValue, Throwable ex) Take the arguments at the method execution join point and output a set of arguments to the advice method
Pointcut	buildSafePointcut() Build a 'safe' pointcut that excludes the AspectJ advice method itself.
void	calculateArgumentBindings() Do as much work as we can as part of the set-up so that argument binding on subsequent advice invocations can be as fast as possible.
protected ParameterNameDiscoverer	createParameterNameDiscoverer() Create a ParameterNameDiscoverer to be used for argument binding.
static org.aspectj.lang.JoinPoint	currentJoinPoint() Lazily instantiate joinpoint for the current invocation.
ClassLoader	getAspectClassLoader() Return the ClassLoader for aspect instances.
AspectInstanceFactory	getAspectInstanceFactory() Return the factory for aspect instances.
Method	getAspectJAdviceMethod() Return the AspectJ-style advice method.
String	getAspectName() The name of the aspect (bean) in which the advice was declared.
int	getDeclarationOrder() The declaration order of the advice member within the aspect.
protected Object	getDiscoveredReturningGenericType()
protected Class	getDiscoveredReturningType()
protected Class	getDiscoveredThrowingType()
protected org.aspectj.lang.JoinPoint	getJoinPoint() Overridden in around advice to return proceeding join point.
protected org.aspectj.weaver.tools.JoinPointMatch	getJoinPointMatch() Get the current join point match at the join point we are being dispatched on.
protected org.aspectj.weaver.tools.JoinPointMatch	getJoinPointMatch(ProxyMethodInvocation pmi)
int	getOrder() Return the order value of this object, with a higher value meaning greater in terms of sorting.
AspectJExpressionPointcut	getPointcut() Return the AspectJ expression pointcut.
protected Object	invokeAdviceMethod(org.aspectj.lang.JoinPoint jp, org.aspectj.weaver.tools.JoinPointMatch jpMatch, Object returnValue, Throwable t)
protected Object	invokeAdviceMethod(org.aspectj.weaver.tools.JoinPointMatch jpMatch, Object returnValue, Throwable ex) Invoke the advice method.
protected Object	invokeAdviceMethodWithGivenArgs(Object[] args)
void	setArgumentNames(String argNames) Set by creator of this advice object if the argument names are known.
void	setArgumentNamesFromStringArray(String[] args)
void	setAspectName(String name)
void	setDeclarationOrder(int order) Sets the declaration order of this advice within the aspect
void	setReturningName(String name)
protected void	setReturningNameNoCheck(String name) We need to hold the returning name at this level for argument binding calculations, this method allows the afterReturning advice subclass to set the name.
void	setThrowingName(String name)
protected void	setThrowingNameNoCheck(String name) We need to hold the throwing name at this level for argument binding calculations, this method allows the afterThrowing advice subclass to set the name.
protected boolean	supportsProceedingJoinPoint()
String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.springframework.aop.aspectj.AspectJPrecedenceInformation

isAfterAdvice, isBeforeAdvice

Field Detail

JOIN_POINT_KEY

protected static final String JOIN_POINT_KEY

Key used in ReflectiveMethodInvocation userAtributes map for the current joinpoint.

aspectJAdviceMethod

protected final Method aspectJAdviceMethod

Constructor Detail

AbstractAspectJAdvice

public AbstractAspectJAdvice(Method aspectJAdviceMethod,
                             AspectJExpressionPointcut pointcut,
                             AspectInstanceFactory aspectInstanceFactory)

Create a new AbstractAspectJAdvice for the given advice method.

Parameters:

aspectJAdviceMethod - the AspectJ-style advice method

pointcut - the AspectJ expression pointcut

aspectInstanceFactory - the factory for aspect instances

Method Detail

currentJoinPoint

public static org.aspectj.lang.JoinPoint currentJoinPoint()

Lazily instantiate joinpoint for the current invocation. Requires MethodInvocation to be bound with ExposeInvocationInterceptor.

Do not use if access is available to the current ReflectiveMethodInvocation (in an around advice).

Returns:

current AspectJ joinpoint, or through an exception if we're not in a Spring AOP invocation.

getAspectJAdviceMethod

public final Method getAspectJAdviceMethod()

Return the AspectJ-style advice method.

getPointcut

public final AspectJExpressionPointcut getPointcut()

Return the AspectJ expression pointcut.

buildSafePointcut

public final Pointcut buildSafePointcut()

Build a 'safe' pointcut that excludes the AspectJ advice method itself.

Returns:

a composable pointcut that builds on the original AspectJ expression pointcut

See Also:

getPointcut()

getAspectInstanceFactory

public final AspectInstanceFactory getAspectInstanceFactory()

Return the factory for aspect instances.

getAspectClassLoader

public final ClassLoader getAspectClassLoader()

Return the ClassLoader for aspect instances.

getOrder

public int getOrder()

Description copied from interface: Ordered

Return the order value of this object, with a higher value meaning greater in terms of sorting.

Normally starting with 0 or 1, with Ordered.LOWEST_PRECEDENCE indicating greatest. Same order values will result in arbitrary positions for the affected objects.

Higher value can be interpreted as lower priority, consequently the first object has highest priority (somewhat analogous to Servlet "load-on-startup" values).

Note that order values below 0 are reserved for framework purposes. Application-specified values should always be 0 or greater, with only framework components (internal or third-party) supposed to use lower values.

Specified by:

getOrder in interface Ordered

Returns:

the order value

See Also:

Ordered.LOWEST_PRECEDENCE

setAspectName

public void setAspectName(String name)

getAspectName

public String getAspectName()

Description copied from interface: AspectJPrecedenceInformation

The name of the aspect (bean) in which the advice was declared.

Specified by:

getAspectName in interface AspectJPrecedenceInformation

setDeclarationOrder

public void setDeclarationOrder(int order)

Sets the declaration order of this advice within the aspect

getDeclarationOrder

public int getDeclarationOrder()

Description copied from interface: AspectJPrecedenceInformation

The declaration order of the advice member within the aspect.

Specified by:

getDeclarationOrder in interface AspectJPrecedenceInformation

setArgumentNames

public void setArgumentNames(String argNames)

Set by creator of this advice object if the argument names are known.

This could be for example because they have been explicitly specified in XML, or in an advice annotation.

Parameters:

argNames - comma delimited list of arg names

setArgumentNamesFromStringArray

public void setArgumentNamesFromStringArray(String[] args)

setReturningName

public void setReturningName(String name)

setReturningNameNoCheck

protected void setReturningNameNoCheck(String name)

We need to hold the returning name at this level for argument binding calculations, this method allows the afterReturning advice subclass to set the name.

getDiscoveredReturningType

protected Class getDiscoveredReturningType()

getDiscoveredReturningGenericType

protected Object getDiscoveredReturningGenericType()

setThrowingName

public void setThrowingName(String name)

setThrowingNameNoCheck

protected void setThrowingNameNoCheck(String name)

We need to hold the throwing name at this level for argument binding calculations, this method allows the afterThrowing advice subclass to set the name.

getDiscoveredThrowingType

protected Class getDiscoveredThrowingType()

calculateArgumentBindings

public final void calculateArgumentBindings()

Do as much work as we can as part of the set-up so that argument binding on subsequent advice invocations can be as fast as possible.

If the first argument is of type JoinPoint or ProceedingJoinPoint then we pass a JoinPoint in that position (ProceedingJoinPoint for around advice).

If the first argument is of type JoinPoint.StaticPart then we pass a JoinPoint.StaticPart in that position.

Remaining arguments have to be bound by pointcut evaluation at a given join point. We will get back a map from argument name to value. We need to calculate which advice parameter needs to be bound to which argument name. There are multiple strategies for determining this binding, which are arranged in a ChainOfResponsibility.

supportsProceedingJoinPoint

protected boolean supportsProceedingJoinPoint()

createParameterNameDiscoverer

protected ParameterNameDiscoverer createParameterNameDiscoverer()

Create a ParameterNameDiscoverer to be used for argument binding.

The default implementation creates a PrioritizedParameterNameDiscoverer containing a LocalVariableTableParameterNameDiscoverer and an AspectJAdviceParameterNameDiscoverer.

argBinding

protected Object[] argBinding(org.aspectj.lang.JoinPoint jp,
                              org.aspectj.weaver.tools.JoinPointMatch jpMatch,
                              Object returnValue,
                              Throwable ex)

Take the arguments at the method execution join point and output a set of arguments to the advice method

Parameters:

jp - the current JoinPoint

jpMatch - the join point match that matched this execution join point

returnValue - the return value from the method execution (may be null)

ex - the exception thrown by the method execution (may be null)

Returns:

the empty array if there are no arguments

invokeAdviceMethod

protected Object invokeAdviceMethod(org.aspectj.weaver.tools.JoinPointMatch jpMatch,
                                    Object returnValue,
                                    Throwable ex)
                             throws Throwable

Invoke the advice method.

Parameters:

jpMatch - the JoinPointMatch that matched this execution join point

returnValue - the return value from the method execution (may be null)

ex - the exception thrown by the method execution (may be null)

Returns:

the invocation result

Throws:

Throwable - in case of invocation failure

invokeAdviceMethod

protected Object invokeAdviceMethod(org.aspectj.lang.JoinPoint jp,
                                    org.aspectj.weaver.tools.JoinPointMatch jpMatch,
                                    Object returnValue,
                                    Throwable t)
                             throws Throwable

Throws:

Throwable

invokeAdviceMethodWithGivenArgs

protected Object invokeAdviceMethodWithGivenArgs(Object[] args)
                                          throws Throwable

Throws:

Throwable

getJoinPoint

protected org.aspectj.lang.JoinPoint getJoinPoint()

Overridden in around advice to return proceeding join point.

getJoinPointMatch

protected org.aspectj.weaver.tools.JoinPointMatch getJoinPointMatch()

Get the current join point match at the join point we are being dispatched on.

getJoinPointMatch

protected org.aspectj.weaver.tools.JoinPointMatch getJoinPointMatch(ProxyMethodInvocation pmi)

toString

public String toString()

Overrides:

toString in class Object