CODEWITHSUNDEEP
javamultithreadingconcurrencythreadpool
gpa
gpa

Reputation: 2451

ExecutorService shutdown hook

I have console application with following threading code. It seems when i hit Ctrl+C to terminate it does not detect control keys, i have to close command prompt window.

Any clues why it is not detecting ctrl+c?

            final ExecutorService executor = Executors.newFixedThreadPool(threadPoolSize);
        final long SHUTDOWN_TIME = TimeUnit.SECONDS.toMillis(10);
        for (int i = 0; i < threadPoolSize; i++) {
            executor.submit(new MessageWorker(topicSubscriber));
        }
        //--
        //Add JVM shutdown hook
        Runtime.getRuntime().addShutdownHook(new Thread() {
            /**
             * @see java.lang.Thread#run()
             */
            @Override
            public void run() {
                executor.shutdown();
                try {
                    if (!executor.awaitTermination(SHUTDOWN_TIME, TimeUnit.SECONDS)) {
                        log.warn("Executor did not terminate in the specified time.");
                        List<Runnable> droppedTasks = executor.shutdownNow();
                        log.warn("Executor was abruptly shut down. " + droppedTasks.size() + " tasks will not be executed.");
                    }
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        });

Upvotes: 10

Views: 8237

Answers (1)

SplinterReality
SplinterReality

Reputation: 3410

Just a guess from reading the code, but, it looks like your shutdown time is set as 10,000 seconds, so I'm not surprised you don't think it's quitting!

    final long SHUTDOWN_TIME = TimeUnit.SECONDS.toMillis(10);
    ...
    if (!executor.awaitTermination(SHUTDOWN_TIME, TimeUnit.SECONDS)) {

Upvotes: 8

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