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How to capture a caller in an aspect [message #645412]

Fri, 17 December 2010 07:55

Jingang Zhou

Messages: 57
Registered: December 2010

Member

I want to use an aspect to track methods invoke, e.g., on ClassA's foo() method, if any class invokes this method, I will print "Class XXXX invoked foo.", however, I don't know how to get the class XXXX 's infomation, how to do it?

Thanks.

[Updated on: Fri, 17 December 2010 07:58]

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Re: How to capture a caller in an aspect [message #645529 is a reply to message #645412]

Fri, 17 December 2010 16:43

Andrew Eisenberg

Messages: 382
Registered: July 2009

Senior Member

You could use the this() pointcut. for example:

before(Object o) : call(public void ClassA.foo()) && this (o) {
  System.out.println("Class " + o.getClass());
}

But, the only way this will work is if the call sites themselves are woven. This means that the classes that call foo() must be sent through the weaver.

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Re: How to capture a caller in an aspect [message #645698 is a reply to message #645529]

Mon, 20 December 2010 02:44

Jingang Zhou

Messages: 57
Registered: December 2010

Member

Thank you Andrew.

Such a constrain is not feasible in our scenario, so do you have any better ideas?

Thanks.

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Re: How to capture a caller in an aspect [message #645703 is a reply to message #645698]

Mon, 20 December 2010 04:06

Andrew Eisenberg

Messages: 382
Registered: July 2009

Senior Member

No. If you are not weaving call sites, then there is no way to determine the calling type. It's possible that you could use load time weaving for this, however. But, I would recommend against trying load time weaving on JDK classes (it may be possible in some situations, but is really, really tricky).

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