在Java中从线程池运行静态方法

Question

什么是使用线程池在多个线程中运行静态方法的最佳方式？同时，我尝试将参数传递给静态方法，类似于：

Class A{
 public static runTask(int i){
   ....
 }

}

并从主要功能中：

ThreadPool pool = new ThreadPool(5, "poolname");

for(int i=1; i<10; i++){

   A.runTask(i) // but on a new thread...

}

谢谢！

- yken

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我希望你不打算使用可变的静态字段。 - Tom Hawtin - tackline

Answer 1

请参阅 java.util.concurrent.Executors 的文档。这个库应该符合您的需求。以下是使用它的一个简单示例：

public class ExecutorServiceTest {
    static ExecutorService threadPool = Executors.newCachedThreadPool();

    public static void main(String[] args) throws Exception {
        // Queue 10 executions of someTask into the threadPool 
        for(int i = 0; i < 10; i++) {
            runSomeTaskInThreadPool();
        }
        // the shutdown method causes the executor to:
        // 1. stop accepting new tasks, and
        // 2. allow previously queued jobs to complete, and
        // 3. shut down all pooled threads once all jobs are complete  
        threadPool.shutdown();
        // block until the threadPool has finished shutting down,
        // which indicates that all tasks have finished executing
        threadPool.awaitTermination(Long.MAX_VALUE, TimeUnit.MILLISECONDS);
    }

    private static void runSomeTaskInThreadPool() {
        Future future = threadPool.submit(new Runnable() {
            public void run() {
                someTask();
            }
        });
        // TODO: Maybe keep track of futures to monitor success/failure of task
    }

    static AtomicInteger counter = new AtomicInteger();
    public static void someTask() {
        System.out.println("someTask: " + counter.incrementAndGet() 
                + " on thread: " + Thread.currentThread());
    }
}

- Mike Clark

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你能具体一些吗？是哪一个执行器，以及应该如何使用它？ - yken

Answer 2

请查看详细的实现指南： http://java.sun.com/developer/Books/javaprogramming/threads/chap13.pdf

- Mohamed Saligh