how to get current process group id in a custom nifi processor?,how to get current process group id in a custom processor?

[#1]

I have created a nifi custom processor, I need get a current process group id, How can I do that?

Say for instance I need to update the flowfile attribute with the process group id for some later report generation or something.... Is it possible to get the current process group id?

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I have created a custom processor. At runtime I want to get the process group id, How do i do that?.

Say for instance I want update the flowfile attribute of every data packet with process group id, so that I can manipulate the provenance data based on the this field.

[#2]

I'm Also looking for the solution for the above Question.. If someone impletemented please share your thoughts