Re: Determining Caller class of a method

Hi Dave,

 Thanks very much for the information. I will try this out.

Regards
Shrinivas Joshi



On Tue, 21 Jun 2005, David Hovemeyer wrote:

> Shrinivas Joshi wrote:
>
> >Hi All,
> >  Is there any way by which one can determine the name/type of the class
> >that invokes a particular method of some other class. I need to do this
> >when the application control is within the method being called. I looked
> >at BCEL ControlFlowGraph, Frame and OperandStack classes but it seems that
> >they dont fetch any information related to caller class.
> >Kindly let me know if someone has worked on similar requirement.
> >
> >
>
> I am assuming you need to do this at runtime, since finding out the
> callers statically is generally impossible.
>
> One possible approach is to insert a call to a static instrumentation method
> into the method you are trying to capture the callers for.   The
> instrumentation
> method can create a stack trace as follows:
>
>     StackTraceElement[] trace = new Throwable().getStackTrace();
>
> Each stack trace element has the class name, method name, and line number
> of the call site.  You'll want to skip the top element, since it refers to
> the instrumentation method.
>
> Note that you will have to use the line number to figure out
> which version of the method is called if there are overloaded variants.
> (If the class doesn't have line number information, then you're out of
> luck.)
> However, since all you need is the class name, then this approach should
> do what you need.
>
> This works for 1.4 and later VMs.  On earlier VMs you can accomplish
> more or less the same thing using printStackTrace() and supplying a
> PrintWriter backed by a StringWriter or similar object, and manually parsing
> the printed stack trace.
>
> Hope this helps.
>
> -Dave
>
>
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