Add support for saving variables between different threads

[ydarlico]

Hello! Add support for saving and using variables between different thread groups in the same class.
In my case, in setupThreadGroup() I receive a number of variables via JDBC requests. And then I want to set parameters in the next thread group (threads(count_vu)/ rampup/ loop) using the values ​​from the last thread.

But the script crashes with an error because it does not see the variables. I save them through

jdbcSampler(//some request//).vars("count_vu"),
jsr223Sampler("JSR223 Sampler",
c -> {
    int count_vu = Integer.parseInt(c.vars.get("count_vu_1"));
    c.props.setProperty("count_vu_uc42", c.vars.get("count_vu_1"));
...

If there is another way to store and handle them, please indicate how.

[rabelenda]

JMeter variables are scoped to threads.

Usually, for simple scenarios, I just use JMeter or System properties as you did in the example.

There might be other more complex means of sharing like storing in a file, using a queue, db, etc. One of which might be through the usage of Inter Thread Communication plugin.

[rabelenda]

@ydarlico do you think we should close this issue? Does my answer help? Or do you think we should do something else in this regard?

[ydarlico]

@rabelenda Yes, you can close the task.

For those who stumble upon it, I want to say that I solved my problem of simultaneous initialization of threads by converting jdbcSampler + jsr223Sampler into a separate class with code purely in java. This class is located before testPlan and, when executed, saves all parameters for future threads in map.