Re: shutdown executor service

Eric Sosman <esosman@comcast-dot-net.invalid>
Thu, 04 Dec 2014 10:00:27 -0500
On 12/4/2014 9:42 AM, mike wrote:


I found the following code in our code base in the same class.

private final ExecutorService executor = Executors.newCachedThreadPool();

List<Future<T>> startExcuting() {
         try {
             return executor.invokeAll(Lists.newArrayList(tasks));
         } catch (InterruptedException e) {
             throw new AppException("startExcuting interrupted", e);
         } finally {


My question is: Should we not have executor.shutdown(); or threads might live longer. Is that correct?

     This kind of ExecutorService will terminate idle threads after
sixty seconds, so although the threads might live "longer" they will
not live "forever."

     However: Is startExcuting [sic] called once only, or more than
once (presumably with different sets of tasks)? If you shut it down
after the first use, you will not be able to use it again. So, it
depends on what your program wants to do ...

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