Can't get the correct execution time value for transaction controller with prev.getTime() in JSR sampler

Question

fellow QAs! Background - apache jmeter 4.0 is used in combination with ChromeWebDriver for loadtesting a jsf web application. In jmeter numerous JSR223\Groovy samplers are used to control locally started chromedriver by executing org.openqa.selenium methods. My current task is to implement pacing. I took this tutorial - https://www.blazemeter.com/blog/how-to-easily-implement-pacing-jmeter as a basis, and it looks to work ok at first, but there's one problem, kind of a strange one, that I can't defeat. When I put several jsr223 samplers under a transaction controller, and place another JSR right after it, with this code:

//Sets the pacing length based on the last requests response time. 4500 is the time in ms
Long pacing = 4500 - prev.getTime();

//If the response time is less than 4500 ms, set the delay value to myDelay
if ( pacing > 0 ) 
{ 
    //iPacing is equal to the int value of pacing if pacing is not equal to null, otherwise iPacing is null
    Integer iPacing = pacing != null ? pacing.intValue() : null; 
    log.info(String.valueOf(iPacing));
    vars.put("myDelay", String.valueOf(iPacing)); 
    return iPacing; 
}
//The response time is greater than or equal to 4500 ms, set myDelay to 0
else 
{ 
    vars.put("myDelay", "0");
    return 0; 
}

the prev.getTime() method returns execution time only for the last sampler under a transaction controller, not the total time! I tried setting and unsetting "Generate parent sample" checkbox - result is still the same. Here is how the scenario looks: Any help will be greatly apreciated!

Answer 1

Transaction Controller is a different beast, you can fetch total transaction controller execution time as prev.getParent().getTime()

Just in case if you need individual Transaction Controller's children you can go for prev.getParent().getSubResults() function:

prev.getParent().getSubResults().each {result ->
    log.info('Sampler: ' + result.getSampleLabel() + ' Elapsed time: ' + result.getTime() )
}