我在Java服务器中拥有五个线程，如何使它们同时运行一个任务？

Question

I write a web server in java, and need a task class to upload data to anther server, so I do this as below:

ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(5)
executor.scheduleAtFixedRate(new Task(), 0, 100, TimeUnit.SECOND);

The Task has implement Runnable . The question is,every time only one thread is scheduled to run this new Task() , others just idle, if a large number of data coming, my work queue which store data become very large, more worse, I can't get real time data in anther server. My English is too bad, I am wandering if you have my got my point, I want to find a way to fix this, can you help me ?

Answer 1

To run 5 tasks at once you need 5 tasks which take long enough that different threads will be used. If you add one task, it will use one thread. If you add 5 small tasks, they might be all run by the same thread.

Answer 2

Have you tried this?

ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(5);
Task task=new Task();
executor.scheduleAtFixedRate(task, 0, 100, TimeUnit.SECOND);
executor.scheduleAtFixedRate(task, 0, 100, TimeUnit.SECOND);
executor.scheduleAtFixedRate(task, 0, 100, TimeUnit.SECOND);
executor.scheduleAtFixedRate(task, 0, 100, TimeUnit.SECOND);
executor.scheduleAtFixedRate(task, 0, 100, TimeUnit.SECOND);

in this way you will have Only one task scheduled to run in 5 threads. just make sure you have Task thread safe (as you will be running same task within 5 threads).