Re: [aspectj-users] Logging JNI calls with AspectJ

[Adrian Colyer <adrian_colyer@xxxxxxxxxx>]

You can't add execution advice to a native method since there is no Java 
method for the AspectJ compiler to work with. See the implementation notes 
at http://www.eclipse.org/aspectj/doc/progguide/implementation.html.

However, you can probably get the effect you want by using the following 
variation on your aspect:

public aspect LogNativeAspect {

  private static boolean isNative(JoinPoint.StaticPart jpsp) {
    return Modifier.isNative(jpsp.getSignature().getModifiers());
  }

  pointcut nativeMethodCall() : call( * *(..)) && 
if(isNative(thisJoinPointStaticPart));

  before() : nativeMethodCall() && !within(LogNativeAspect) {
     Logger.debug("Calling " + 
thisJoinPointStaticPart.getSignature().toLongString());
  }

}

If you know the target namespace of the native methods you want to log 
(like they're all in org.xyz..* packages) then you should tighten up the 
nativeMethodCall() pointcut, 

e.g.  pointcut nativeMethodCall() ; call(* org.xyz..*.*(..)) && 
if(isNative(thisJoinPointStaticPart));

*disclaimer - I haven't compiled this code...

-- Adrian
Adrian_Colyer@xxxxxxxxxx



"Shah, Manish" <Manish.Shah@xxxxxxxx> 
Sent by: aspectj-users-bounces@xxxxxxxxxxx
26/04/2005 09:18
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Subject
[aspectj-users] Logging JNI calls with AspectJ






Hi,

Is is possible to create a pointcut that intercepts native methods that
invoke non-java code through JNI?

I'd like to be able to put a logging aspect into an existing piece of code
that does lots of native invocations. Here's my aspect:

public aspect LogNativeAspect {

    private Logger LOGGER = Logger.getLogger("LogNativeAspect");

    pointcut traceMethods()
        : execution(*  *.*(..)) && !within(LogNativeAspect);

    before() : traceMethods() {

        Signature signature = thisJoinPointStaticPart.getSignature();

        if (Modifier.isNative(signature.getModifiers())) {
                       LOGGER.debug("Calling: " + 
signature.toLongString());
        }
    }
}

If I remove the conditional check on Modifier.isNative, then all other
method calls get logged. However, native methods don't get intercepted. Is
this supported?

Cheers,
Manish


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