java - ThreadPoolExecutor与Android的线程优先级

Question

我想制作一个 ThreadPollExecutor 来执行具有给定优先级的任务 Process.setThreadPriority(int) .

我应该怎么做？在发送到线程轮询的每个可运行对象的开头添加对 setThreadPriority 的调用？我还考虑过使用这样的自定义线程工厂:

private final static class ProcessPriorityThreadFactory implements ThreadFactory {

    private final int threadPriority;

    public ProcessPriorityThreadFactory(int threadPriority) {
        super();
        this.threadPriority = threadPriority;
    }

    @Override
    public Thread newThread(Runnable r) {
        return new Thread(new PriorityChangeWrapper(r, threadPriority));
    }

    private final static class PriorityChangeWrapper implements Runnable {
        private final Runnable originalRunnable;
        private final int threadPriority;

        public PriorityChangeWrapper(Runnable originalRunnable, int threadPriority) {
            super();
            this.originalRunnable = originalRunnable;
            this.threadPriority = threadPriority;
        }

        @Override
        public void run() {
            Process.setThreadPriority(threadPriority);
            originalRunnable.run();
        }

    }

}

这个问题的最佳解决方案是什么？谢谢

Answer 1

您问题中给出的自定义工厂是执行此操作的正确方法。正是因为这个原因才使用工厂模式，因为它使您可以完全控制 ExecutorService 创建的所有线程。 (例如，您还可以更改线程名称等)。

你的工厂实现比需要的要复杂得多，你只需要:

private final static class ProcessPriorityThreadFactory implements ThreadFactory {

    private final int threadPriority;

    public ProcessPriorityThreadFactory(int threadPriority) {
        this.threadPriority = threadPriority;
    }

    @Override
    public Thread newThread(Runnable r) {
        Thread thread = new Thread(r);
        thread.setPriority(threadPriority);
        return thread;
    }

}