With a Java ExecutorService, how do I complete actively executing tasks but halt the processing of waiting tasks?

Question

I am using an ExecutorService (a ThreadPoolExecutor) to run (and queue) a lot of tasks. I am attempting to write some shut down code that is as graceful as possible.

Exe

Answer 1

You can wrap each submitted task with a little extra logic

wrapper = new Runnable()
    public void run()
        if(executorService.isShutdown())
            throw new Error("shutdown");
        task.run();

executorService.submit(wrapper);

the overhead of extra checking is negligible. After executor is shutdown, the wrappers will still be executed, but the original tasks won't.