[aspectj-users] Re: [NEWSDELIVER] Help: how to get calling class for sta

[Matthew Webster <matthew_webster@xxxxxxxxxx>]

SunnyDay,

Use thisJoinPoint.getSignature().getDeclaringType()
for the target class and thisEnclosingJoinPointStaticpart... for the caller.

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/

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Subject:        [NEWSDELIVER] Help: how to get calling class for static methods?



Hello,

I am having trouble in obtaining the caller and callee's classes if a
method call is made within the caller's static method. For example:

public class A
{
                public static void call1()
                {
                                 B.changeField();
                }
}

public class B {
                public static void changeField()
                {
                                 System.out.println("from B");
                }                
}

How can I know the caller is class A and the callee is class B? I tried
the following pointcut:

pointcut staticMethodCall() : call(static * *.*(..));
               
after() : staticMethodCall()
{
                Class calleeClass = thisJoinPoint.getSignature().getDeclaringType();
                                 
       Object caller = thisJoinPoint.getThis();
                                 
                if (caller == null)
               
                                 caller = thisJoinPoint.getSourceLocation().getWithinType();
}

Here I used thisJoinPoint.getSignature().getDeclaringType() to obtain the
callee's class. But I am not sure what's the exact meaning of "Signature"
in the context of a method call. Does it always give me the type of the
callee?

For the caller, I used thisJoinPoint.getSourceLocation().getWithinType();
But what if I test a program where no source code is available? Can I
still call thisJoinPoint.getSourceLocation()?

All these seem to work for now but I am really wondering if this is a good
solution. I appreciate any advice and code snippet!

Thank you,

SunnyDay