如何正确地从Executors捕获RuntimeException？ [英] How to properly catch RuntimeExceptions from Executors?

问题描述

说我有以下代码：

ExecutorService executor = Executors.newSingleThreadExecutor();
executor.execute(myRunnable);

现在，如果 myRunnable c $ c> RuntimeExcpetion ，我该如何抓住它？一种方法是提供我自己的 ThreadFactory 实现到 newSingleThreadExecutor（）并设置自定义 uncaughtExceptionHandler 用于从它出来的线程。另一种方法是将 myRunnable 包含到包含try-catch块的本地（匿名） Runnable 。也许还有其他类似的解决方法。但是...不知怎的这种感觉很脏，我觉得它不应该是这么复杂。是否有一个干净的解决方案？

Now, if myRunnable throws a RuntimeExcpetion, how can I catch it? One way would be to supply my own ThreadFactory implementation to newSingleThreadExecutor() and set custom uncaughtExceptionHandlers for the Threads that come out of it. Another way would be to wrap myRunnable to a local (anonymous) Runnable that contains a try-catch -block. Maybe there are other similar workarounds too. But... somehow this feels dirty, I feel that it shouldn't be this complicated. Is there a clean solution?

推荐答案

干净的解决方法是使用 ExecutorService.submit code>而不是 execute（）。这将返回您未来，您可以使用它来检索任务的结果或异常：

The clean workaround is to use ExecutorService.submit() instead of execute(). This returns you a Future which you can use to retrieve the result or exception of the task:

ExecutorService executor = Executors.newSingleThreadExecutor();
Runnable task = new Runnable() {
  public void run() {
    throw new RuntimeException("foo");
  }
};

Future<?> future = executor.submit(task);
try {
  future.get();
} catch (ExecutionException e) {
  Exception rootException = e.getCause();
}

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