Terminate running script thread

[Attila Szegedi]

No, there’s no support for that. Nashorn compiles all scripts to JVM bytecode and runs them as such. There’s no more of a way to stop that code than any Java code. Even if there was some other way, I don’t see how would stopping a thread be materially better than what Thread#stop provides. I’m not saying there’s no better way, I’m just saying I don’t see it. I’m open to suggestion on how could a different mechanism be better.

I can imagine that if someone wanted something like this, they could implement a ClassFileTransformer and transform the bytecode to maybe add a check for some variable on the back edges of all loops? That’d help with infinite loops in Java code invoked from scripts as well. Of course, if the variable isn’t global, then you’d need to pass it around, or retrieve it from a thread local, which could be expensive (you could add a local variable for every loop to count and only check the thread local every 1000 iterations?) And again, how would the behavior of acting on the “stop” flag be different than a stack unwind through a ThreadDeath?

Lots of questions, but I’m happy to listen and discuss. 

Attila.
 

> On 2021. Feb 27., at 14:53, Viktor Remennik <bbiktop at gmail.com> wrote:
> 
> Is there already a way to terminate a running script? I found some old discussions and articles regarding it, is there any progress these days? It would be great to have something like CompiledScript#stop or something like interrupt handler inside the Nashorn eval, because currently I have to use Thread#stop with all its disadvantages and problems. I have user defined scripts running in my application, users are technicians but still could make a mistakes, so I'd like to control the script execution time and kill scripts threads if configured maximum execution time limit has been exceeded. As Nashorn is standalone now, I suppose I, or maybe someone more experienced in Nashorn's internals, could try to implement this, but I'd like to check first, isn't it is already implemented.
> 
> https://stackoverflow.com/questions/24855182/interrupt-java-thread-running-nashorn-script <https://stackoverflow.com/questions/24855182/interrupt-java-thread-running-nashorn-script>
> http://blog.getsandbox.com/2018/01/15/nashorn-interupt/ <http://blog.getsandbox.com/2018/01/15/nashorn-interupt/>
> 
> 
> Thank you
> 
> Viktor