I am building a custom config element by extending JMeter SDK. I have achieved most of my desired functionality. Last piece is to set a computed value to a JMeter variable so that it can be used in HTTP Samplers.
I looked at existing components implementation – Test Plan and User Defined Variables, but could not figure steps to set a variable value. Argument and Arguments classes are the closest I could get, but not answering the question.
In my config element, I am extending AbstractConfigGui to create GUI components and AbstractTestElement to glue UI and Data.
My code is not available on public domain, but can share snippets if required for further clarifications.
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Answer
You have JMeterVariables class
Class which defines JMeter variables.
You can get them from context:
JMeterVariables vars = JMeterContextService.getContext().getVariables();