[jboss-jira] [JBoss JIRA] Closed: (JBAOP-37) Before, After, After Throwing support

[Flavia Rainone (JIRA)]

     [ http://jira.jboss.com/jira/browse/JBAOP-37?page=all ]

Flavia Rainone closed JBAOP-37.
-------------------------------

    Resolution: Done
      Assignee: Flavia Rainone

> Before, After, After Throwing support
> -------------------------------------
>
>                 Key: JBAOP-37
>                 URL: http://jira.jboss.com/jira/browse/JBAOP-37
>             Project: JBoss AOP
>          Issue Type: Feature Request
>    Affects Versions: 2.0.0.alpha1
>            Reporter: Bill Burke
>         Assigned To: Flavia Rainone
>             Fix For: 2.0.0.alpha4
>
>   Original Estimate: 1 week
>  Remaining Estimate: 1 week
>
> This should be optimized as well.  I've done a non-CVS-checked-in prototype of this.
> Feature Details:
> To use this feature, one should use the xml tags 'before', 'after' and 'throwing'.
> The signature of these advices should take any annotated arguments (annotation rules follow) and 'after' can return a value in order to overwrite/replace the intercepted join point returned value.
> Besides, to continue using the advice around, the user should just continue using the 'advice' xml tag.
> Around advices should either stick to the signature 
> Object [advice_name](Invocation invocation)
> Or they can now use annotated parameters, as in 'before', 'after' and 'throwing'
> The parameters can be annotated with JoinPoint, Invocation, Return, Throwable, Arg, Args, Callee, Caller and Target.
> Parameter Annotation Rules:
> Except for around default signature, all parameters must be annotated with one of the annotations defined in package org.jboss.aop.advice. We have annotations that are allowed only for specific types of join points, and we have annotations that are allowed only for specific types of advices.
> These annotations are allowed depending on the advice type:
> - JoinPoint: Before, After, Throwing
> - Invocation: Around
> - Return: Around, After
> - Throwable: Throwing
> These annotations are allowed depending on the join point type:
> - Callee: call join points
> - Caller: call join points
> - Target: every non-static join point that is not a call
> Finally, we have the mutually exclusive annotations Arg and Args. Both can always be used (but not on the same advice method). The first one must annotate every advice parameter whose value is the value of a join point argument. The second one annotates parameters of type Object[] that must receive all join point arguments values.
> Advice Matching Rules
> Every Arg parameter is bound to a join point argument of the same type. If there is more than one join point argument with the requested type, then the Arg parameter will be bound to the first join point argument that has not been bound yet.
> When there are overloaded advice methods, JBoss AOP will use a priority order to pick the best match. The advice method with the most suitable type of the highest priority annotated parameter type is chosen.
> The increasing priority order of arguments is: Arg/Args, Return/Throwable, Target/Callee/Caller , JoinPoint/Invocation.

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