Stopping a running process via GUI, in java

Question

I have a GUI program that executes TestNG automation scripts. It's meant for users to easily configure some setting and launch the automation script that they want.

One thing I need to add is the ability to instantly stop the running TestNG process. Something like how in Eclipse, the 'Terminate' button will instantly stop whatever is running.

This is what the code that launches the TestNG tests looks like:

public class ScriptRunner implements Runnable {

    public void runScript() {
        Thread testRun = new Thread(this);
        testRun.start();
    }

    @Override
    public void run() {
        //various other things are configured for this, 
        //but they're not relevant so I left them out
        TestNG tng = new TestNG();

        //While this runs, various browser windows are open, 
        //and it could take several minutes for it all to finish
        tng.run();
    }
}

As per the comment, the tng.run() can take several minutes to complete, and it's performing several things, opening/closing browser windows, etc.

How can I just instantly terminate the process, like you would when running an application from an IDE?

EDIT:

Per the comments, I'm attempting to use a ServiceExecutor and shutDownNow() The code is looking like this:

ExecutorService executorService = Executors.newFixedThreadPool(10);

public void runScript() {
    executorService.execute(this);
}

//this method gets called when I click the "stop" button
public void stopRun() {
    executorService.shutdownNow();
}

@Override
public void run() {
    //same stuff as from earlier code
}

Answer 1

Spawn a child JVM process using ProcessBuilder or Runtime and you will be able to terminate that process when the user requests that the script stops running.

Answer 2

You can use ExecutorService to start test execution into one another thread. You can choose to have many thread in parrallel or juste one thread for all tests in sequence by choosing which executor service you need.

After that, start the execution of all tests in the same executor service instance by calling submit() method on it. You can stop the execution of all submitted runnables by calling shutdownNow() method.

It is important to use the same instance of ExecutorService, otherwise you start each test in a different thread and you will not enable to break the execution chain (or by calling shutdownNow() on all of them).