[java] ExecutorService that interrupts tasks after a timeout

Unfortunately the solution is flawed. There is a sort of bug with ScheduledThreadPoolExecutor, also reported in this question: cancelling a submitted task does not fully release the memory resources associated with the task; the resources are released only when the task expires.

If you therefore create a TimeoutThreadPoolExecutor with a fairly long expiration time (a typical usage), and submit tasks fast enough, you end up filling the memory - even though the tasks actually completed successfully.

You can see the problem with the following (very crude) test program:

public static void main(String[] args) throws InterruptedException {
    ExecutorService service = new TimeoutThreadPoolExecutor(1, 1, 10, TimeUnit.SECONDS, 
            new LinkedBlockingQueue<Runnable>(), 10, TimeUnit.MINUTES);
    //ExecutorService service = Executors.newFixedThreadPool(1);
    try {
        final AtomicInteger counter = new AtomicInteger();
        for (long i = 0; i < 10000000; i++) {
            service.submit(new Runnable() {
                @Override
                public void run() {
                    counter.incrementAndGet();
                }
            });
            if (i % 10000 == 0) {
                System.out.println(i + "/" + counter.get());
                while (i > counter.get()) {
                    Thread.sleep(10);
                }
            }
        }
    } finally {
        service.shutdown();
    }
}

The program exhausts the available memory, although it waits for the spawned Runnables to complete.

I though about this for a while, but unfortunately I could not come up with a good solution.

EDIT: I found out this issue was reported as JDK bug 6602600, and appears to have been fixed very recently.

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