辐射4118号避难所:a better way to solve the insufficient in TimedRun1可以处理线程中未捕获的异常

来源：百度文库编辑：九乡新闻网时间：2024/04/30 09:10:04

/**
* 解决TimedRun1中的问题，关键点，任务拥有自己的执行策略，
* 1.即使任务不响应中断，依靠join方法也能在限时之类返回. 1-0 处
* 2.解决发生未检查的异常。 2-0 处
* 1和2两点解决了 TimeRun1不足之处。
* there have two threads, main tread, taskThread thread of task RethrowableTask.
* RethrowableTask use the key word of volatile store the Throwable, which guaranteed this variable of
* Throwable can be visible to share for two thread, main and taskThread.
* when return the method in the main thread, main thread will check whether there have exception in the
* subthread. throw it if have.
* 缺点：
* 我们并不知道是由于任务自然运行后退出，还是由于join超时退出。 1-0处。
*/
public class TimedRun2 {
    private static final ScheduledExecutorService cancelExec = newScheduledThreadPool(1);

    public static void timedRun(final Runnable r,
                                long timeout, TimeUnit unit)
            throws InterruptedException {
        class RethrowableTask implements Runnable {
            private volatile Throwable t;//can be visible to two thread.

            public void run() {
                try {
                    r.run();
                } catch (Throwable t) {
                    this.t = t;
                }
            }

            void rethrow() {
                if (t != null)
                    throw launderThrowable(t);
            }
        }

        RethrowableTask task = new RethrowableTask();
        final Thread taskThread = new Thread(task);
        taskThread.start();
        cancelExec.schedule(new Runnable() {
            public void run() {
                taskThread.interrupt();
            }
        }, timeout, unit);
        taskThread.join(unit.toMillis(timeout));//1-0
        task.rethrow(); //2-0 check whether have exception in subthread, throw it if have.
    }
}

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