Create a Job Queue or Task Controller and dynamically add task to it in Java

问题

Hi all I want to create a job queue to execute multiple task.but,my requirement is i should be able to add tasks to that job queue any time and all those tasks should be executed sequentially. I searched some solutions in internet and found these two links 1)Java Thread Pool Executor Example 2)Java Executor Framework Tutorial and Best Practices. But i can't use both of these solution.Because after starting Executor service I can't add new task to the service. Because we know that It may throw InterruptedException or ConcurrentModificationException.

回答1:

You can use a BlockingQueue to keep waiting in a separate thread until one or more Runnable show up.

public class Mainer {
    private static final BlockingQueue<Runnable> queue = new ArrayBlockingQueue<>(15);

    public static void main(String[] args) {
        Thread t = new Thread(() -> {
            while (true) {
                try {
                    queue.take().run();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

            }
        });
        t.start();

        for (int i = 0; i < 10; i++) {
            queue.add(() -> {
                System.out.println("Hello");
            });
        }
    }

}

回答2:

I think that you should be using an ExecutorService.

It maintains a queue of tasks to be run. You can provide your own queue if you need to.
New tasks can be added at any time using the submit method.
Futures may be obtained when submitting tasks.
Tasks may be run one at a time, or in parallel using a pool of worker threads.
If you use multiple threads, the various executor service implementations provide different pool management strategies.
There are operations for draining and shutting down the service.

you please give some example links

The javadocs have examples.

来源：https://stackoverflow.com/questions/41312981/create-a-job-queue-or-task-controller-and-dynamically-add-task-to-it-in-java

标签

java

multithreading

executorservice