I would suggest to repost this issue under a new topic. (e.g. args
pointcut designature and null arguments).
So it is more likely to get a post from the developers.
Here you find an older discussion of this topic:
http://dev.eclipse.org/mhonarc/lists/aspectj-dev/msg01676.html
So args ha a instanceof semantic and one would aspect null values not
to match.
Normally, with statically determinable pointcuts this is not the case
in aspectj:
before(Runnable arg): execution(* *.*(.., Runnable)) && args(.., arg){
System.err.println("Arg: " + arg);
}
public void test1(Object test, Runnable runnable) {
}
public static void main(String[] args) {
new SignatureTest().test1(null, null);
}
I find in the console a match: Arg: null
So this leads to two questions:
Why is the default behaviour in aspectj inconsistent and matches null
args?
I guess for statically determinable pointcuts this runtiime check is
omitted.
But your pointcut is statically determinable and should macth null args.
The second question is why?
What is your aspectj version and what compiler switches did you set?
Do you use ajdt and eclipse as a development environment? How does
the annotation for the matching signature looks like (Does it have a
runtime
check? Is it advised with more than advice?)
As a workaround omit the binding and get the value for the
transaction object from
thisJoinPoint.getArgs(),
Am 08.02.2007 um 12:54 schrieb David Hatton ((AT/LMI)):
Hi again,
We're getting this to work:
pointcut bcMethodsTransactionAfterMethods(Transaction tx):
(execution (!private * com.ericsson.nms.cif.cs.*.*(..,
Transaction)) && args(.., tx) );
before(Transaction tx): bcMethodsTransactionBeforeMethods(tx) {
CsTrace.traceTransaction(
thisJoinPointStaticPart.getSignature().getDeclaringTypeName(),
thisJoinPointStaticPart.getSignature().getName(),
thisJoinPoint.getArgs(),
tx);
}
But it doesn't seem to work when the Transaction object is null? Is
that expected?
/David
From: [EMAIL PROTECTED] [mailto:aspectj-users-
[EMAIL PROTECTED] On Behalf Of Vincenz Braun
Sent: 07 February 2007 14:50
To: [email protected]
Subject: Re: [aspectj-users] Matching methods with a particular
argument type
One can use .. in the front and the back in method patterns (more
than once).
But you get a compilation error when using more than one .. in
args pointcut designators. This is a compiler limitation because of
ambiguousness
in the binding.
And a
before(): execution(* *.*(.., String, ..)) {
}
public class SignatureTest {
public void test(String arg) {
}
}
will match the SignatureTest.test(String).
And a
before(String arg): execution(* *.*(.., String, ..)) && args(..,
args, ...) {
}
will cause a compilation error: uses more than one .. in args
(compiler limitation)
Am 07.02.2007 um 15:20 schrieb Eric Bodden:
No, I think think this is even syntactically wrong cause you cannot
have ".." both in the front and back. IMHO there is no way to
match on
methods which have a String parameter at an arbitrary place (without
using reflection at least).
Eric
On 2/7/07, Marco Mistroni <[EMAIL PROTECTED]> wrote:
Hi,
Would the last case match:
com.ericsson.nms.cif.cs.Aclass.Amethod(String something); ???
my 2 cents here.
Not in my opinion...
It will match any methods which have 3 parameters in which the
second one is a String.....
anyone could correct me if i m wrong?
regards
marco
Regards,
David
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Eric Bodden
Sable Research Group
McGill University, Montréal, Canada
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evelox Consulting GmbH & Co. KG
email: [EMAIL PROTECTED]
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email: [EMAIL PROTECTED]
phone: +49 700 VINCEBRAUN
mobile: +49 179 2190118
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