Re: [aspectj-users] Again Simple Question

[Matthew Webster <matthew_webster@xxxxxxxxxx>]

Virgil,

You can always get the arguments passed
to a method using thisJoinPoint. After returning advice will match void
methods and the value will be null. You may wish to distinguish between
void and non-void methods as well as capturing exceptions as in the example
below:

public aspect Aspect {

        private pointcut
anyMethod () :
           
    voidMethod() || returningMethod();

        private pointcut
returningMethod () :
           
    execution(!void Test.*(..));

        private pointcut
voidMethod () :
           
    execution(void Test.*(..));
        
        before () : anyMethod()
{
           
    serialize(thisJoinPoint.getArgs());
        }
        
//        after () returning
(Object obj) : anyMethod () {
//            
   serialize(thisJoinPoint.getArgs(),obj);
//        }
        
        after () returning
(Object obj) : returningMethod () {
           
    serialize(thisJoinPoint.getArgs(),obj);
        }
        
        after () returning
: voidMethod () {
           
    serialize(thisJoinPoint.getArgs());
        }
        
        after () throwing(Throwable
th) : anyMethod() {
           
    serialize(thisJoinPoint.getArgs(),th);
        }
        
        private void serialize
(Object args) {
           
    
        }
        
        private void serialize
(Object args, Object ret) {
           
    System.out.println("Aspect.serialize() ret="
+ ret);
        }
        
        private void serialize
(Object args, Throwable th) {
           
    
        }
}

Matthew Webster
AOSD Project
Java Technology Centre, MP146
IBM Hursley Park, Winchester,  SO21 2JN, England
Telephone: +44 196 2816139 (external) 246139 (internal) 
Email: Matthew Webster/UK/IBM @ IBMGB, matthew_webster@xxxxxxxxxx
http://w3.hursley.ibm.com/~websterm/

Please respond to aspectj-users@xxxxxxxxxxx

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To:        aspectj-users@xxxxxxxxxxx
cc:        
Subject:        [aspectj-users] Again Simple Question



    Hi Adrian,

       Thanks for your quick answer on my previous
question. It worked.

       I have another question. I hava a big Java API
and I want to "catch" all method calls serialize
method params&values at input, serialize method
params&values at output and also serialize the
returninc object&value of the method call. The params
& returning value can be any type from void, int,
double to String and also complex Class Types from my
API.

   What I had written

pointcut whenMethodIsCalled(StatefullParentBean bean):
this(bean) && execution (* *.* (..)) &&
!within(TestAPI);
               
pointcut topLevelCalls(StatefullParentBean
bean):whenMethodIsCalled(bean) &&
!cflowbelow(whenMethodIsCalled(StatefullParentBean));
               
I have an
before(StatefullParentBean bean): topLevelCalls(bean)
and also
after(StatefullParentBean bean) : topLevelCalls(bean)
               
in which I serialize input & output params.

But I want to serialize also the return value. For
this can I use after returning in place of after?
In after returning can I still get the values of the
parameters which the methods have? Or I need both
after & after returning 1 for parameters and the other
for return value?
   AspectJ5 knows if I put Object for the returning
value to handle with all types of returning types no
metter if they are void, int, double, String or a
complex type from my API.

Thanks in advance,
Virgil


               
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> Today's Topics:
>
>    1. Re: Need to enumerate all methods for selected
> advices of an
>       aspect (Andy Clement)
>    2. Re: Need to enumerate all methods for selected
> advices                 of an
>       aspect (Wes Isberg)
>    3. Re: [NEWSDELIVER] Getting VerifyError with
> around                 advice on
>       static method (Matthew Webster)
>
>
>
----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 3 Mar 2006 08:12:19 +0000
> From: "Andy Clement" <andrew.clement@xxxxxxxxx>
> Subject: Re: [aspectj-users] Need to enumerate all
> methods for
>                  selected                 advices of an aspect
> To: aspectj-users@xxxxxxxxxxx
> Message-ID:
> <689d61aa0603030012v16d0025ah@xxxxxxxxxxxxxx>
> Content-Type: text/plain; charset="iso-8859-1"
>
> The new reflection support in AspectJ5 will allow
> you to query
> what the advice declarations are, but *not* where
> they are
> affecting (that may follow when we get some time...)
>
> It is possible to use your own message handler which
> will
> then get callbacks for 'weave info' messages.  To
> see the kind
> of information you would get, turn on weave info
> messages
> in the AJDT options panel or pass -showWeaveInfo to
> the
> compiler.  If it looks like what you want, write an
> implementation
> of IMessageHolder and pass the class name with
> -messageHolder to the compiler ... I think that will
> work, although
> I've not tried it !!
>
> Andy.
>
>
> On 03/03/06, András Imre <andras.imre@xxxxxxxxx>
> wrote:
> >
> > Hi,
> >
> > I have an aspect, which checks access permissions
> before
> > allowing execution of certain methods for the
> current user.
> > This is done with around advice.
> >
> > Now I'd like generate a file, in which each
> affected method
> > is listed for this aspect. In this way I'd have an
> automated
> > way to get an always up-to-date template which
> could be
> > used for creating an access permission
> configuration file.
> >
> > I see this info e.g. on the Cross References tab
> in Eclipse,
> > and as AspectJ markers, but cant export from
> either, and
> > would not be automatic.
> > Is there a way to generate this automatically,
> preferably in
> > similar format and structure to the
> thisJoinPoint.toString()
> > variations?
> >
> > I tried messing with reflection, but could not
> access
> > aspects this way... Can aspects be investigated
> runtime?
> >
> >
> > Thanks,
> >   András
> > _______________________________________________
> > aspectj-users mailing list
> > aspectj-users@xxxxxxxxxxx
> >
>
https://dev.eclipse.org/mailman/listinfo/aspectj-users
> >
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> ------------------------------
>
> Message: 2
> Date: Fri, 3 Mar 2006 00:43:38 -0800
> From: "Wes Isberg" <wes@xxxxxxxxxxxxxx>
> Subject: Re: [aspectj-users] Need to enumerate all
> methods for
>                  selected advices                 of an aspect
> To: aspectj-users@xxxxxxxxxxx
> Message-ID:
> <20060303004338.1250926427.wes@xxxxxxxxxxxxxx>
> Content-Type: text/plain; charset="utf-8"
>
> Another option is to post-process declare warning
> messages.  Given
>
>   aspect A {
>       declare warning: Permissions.access() :
> "Access";
>   }
>
> ajc will emit messages of the form
> ------------
> C:\src\C.java:44 [warning] Access
> class C { void m(){} }
> ^^^^^^^^^^^^^^^^^^^^^
>         method-execution(void M.m())
>         see also: C:\src\A.java:22::0
> ------------
>
> Capture the messages from the command-line or by
> installing a
> message handler (using iajc/Ant or the very new
> undocumented
> ajc flag -messageHolder) and munge them to produce a
> config file.
>
> Not pretty!
>
> Wes
>
> ------------Original Message------------
> From: "Andy Clement" <andrew.clement@xxxxxxxxx>
> To: aspectj-users@xxxxxxxxxxx
> Date: Fri, Mar-3-2006 0:11 AM
> Subject: Re: [aspectj-users] Need to enumerate all
> methods for selected advices of an aspect
> The new reflection support in AspectJ5 will allow
> you to query
> what the advice declarations are, but *not* where
> they are
> affecting (that may follow when we get some time...)
>
> It is possible to use your own message handler which
> will
> then get callbacks for 'weave info' messages.  To
> see the kind
> of information you would get, turn on weave info
> messages
> in the AJDT options panel or pass -showWeaveInfo to
> the
> compiler.  If it looks like what you want, write an
> implementation
> of IMessageHolder and pass the class name with
> -messageHolder to the compiler ... I think that will
> work, although
> I've not tried it !!
>
> Andy.
>
>
>
> On 03/03/06, András Imre <andras.imre@xxxxxxxxx>
> wrote:
> Hi,
>
> I have an aspect, which checks access permissions
> before
> allowing execution of certain methods for the
> current user.
> This is done with around advice.
>
>
=== message truncated ===

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