Processor Class in Appian

can you tell me anything about the processor class used in Appian?  
def processor = new ResponseProcessor(prev.getResponseDataAsString()) 9:43:37 AM

facing some issues in the code which is written in Groovy.

This response class is coming from Appian which i am not able to figureout.

I dont have much idea about this, trying to work on Jmeter performance testing.

Can someone help me on this?

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