Re: [aspectj-users] Additional Information Passing

[Simon Heinzle <simon.heinzle@xxxxxxxxxx>]

Mathew,

there are no common criteria which parameters to exclude. For example 
parameters that should not be logged are username/password, account 
information, keys, ...

Passing additional information would solve the problem by passing a 
exclusion bit mask: (bit i) == 1 --> do not trace parameter i, ...

For example:

********************************************************************

// pointcut, passing information via exclusionMask
pointcut TracePC(int exclusionMask) :
    (execution (* *..SomeClass.someMethod(..)) && exclusionMask(5))
    (execution (* *..OtherClass.method(..))    && exclusionMask(0))
    || ...

// corresponding advice
before(int exclusionMask) : TracePC(exclusionMask) {
    // get this pointer
    Object calleeThis = thisJoinPoint.getThis();

    // get signature
    CodeSignature methodSignature =
        (CodeSignature) thisJoinPoint.getSignature();
    String methodName = methodSignature.getName();

    // get parameter names & parameters
    Object[] paramNames = methodSignature.getParameterNames();
    Object[] paramObjects = thisJoinPoint.getArgs();
    Object[][] methodParams = new Object[paramNames.length][2];

    // copy and mask out parameters
    for (int i=0; i<paramNames.length; i++) {
        methodParams[i][0] = paramNames[i];
        if ((excludeMask & 1) == 0) {
            methodParams[i][1] = paramObjects[i];
        }
        else {
            methodParams[i][1] = "* masked *";
        }
        excludeMask = excludeMask >> 1;
    }

    log.entering(calleeThis, methodName, methodParams);
}

********************************************************************

Regards,
Simon



Matthew Webster wrote:
> Simon,
>
> What are your criteria for excluding a piece of information from the trace?
> How do you wish to exclude it (not trace the method at all or just the
> object)? How does passing additional information (what do you have in mind)
> help with this problem?
>
> 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/
>
> Simon Heinzle <simon.heinzle@xxxxxxxxxx>@eclipse.org on 03/05/2005 16:31:20
>
> Please respond to aspectj-users@xxxxxxxxxxx
>
> Sent by:    aspectj-users-bounces@xxxxxxxxxxx
>
>
> To:    AspectJ <aspectj-users@xxxxxxxxxxx>
> cc:
> Subject:    [aspectj-users] Additional Information Passing
>
>
> Hi all,
>
> Is there really no way to pass additional information to a pointcut
> other than Joinpoints, Parameter Arguments, ... ?
>
> We're currently working on a Logging-Aspect, but we must be able to mask
> out security sensitive parameters. One pointcut + advice for each
> "masking configuration" (Parameter 1 logged, Param 2 not, ..) is a
> solution, but not a very readable and extensible one (and of course, 6
> parameter-methods could possibly infer 64 such pointcuts).
>
> Any suggestions how to solve this problem?
>
> Regards,
> Simon
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>
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