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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