Groups > comp.lang.java.programmer > #34018

Re: ExecutorService.shutdown ambiguity

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From	v_borchert@despammed.com (Volker Borchert)
Newsgroups	comp.lang.java.programmer
Subject	Re: ExecutorService.shutdown ambiguity
Date	18 Mar 2016 20:20:59 GMT
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Roedy Green wrote:
> Here is the JavaDoc for ExecutorService.shutdown.
> To me it is ambiguous. How do you read it?
> 
> What happens to a task in queue? What happens to a task that is
> executing?
> 
>      * Initiates an orderly shutdown in which previously submitted
>      * tasks are executed, but no new tasks will be accepted.
>      * Invocation has no additional effect if already shut down.
>      *
>      * <p>This method does not wait for previously submitted tasks to
>      * complete execution.  Use {@link #awaitTermination
> awaitTermination}
>      * to do that.
>      *
>      * @throws SecurityException if a security manager exists and
>      *         shutting down this ExecutorService may manipulate
>      *         threads that the caller is not permitted to modify
>      *         because it does not hold {@link
>      *         java.lang.RuntimePermission}{@code ("modifyThread")},
>      *         or the security manager's {@code checkAccess} method
>      *         denies access.
>      */
>     void shutdown();

I'd expect: They will be executed normally. Therefore, you shouldn't
do anything really drastic like System.exit() until awaitTermination()
has returned.

-- 

"I'm a doctor, not a mechanic." Dr Leonard McCoy <mccoy@ncc1701.starfleet.fed>
"I'm a mechanic, not a doctor." Volker Borchert  <v_borchert@despammed.com>

Thread

ExecutorService.shutdown ambiguity Roedy Green <see_website@mindprod.com.invalid> - 2016-03-18 12:37 -0700
  Re: ExecutorService.shutdown ambiguity Jeff Higgins <jeff@invalid.invalid> - 2016-03-18 20:52 +0000
  Re: ExecutorService.shutdown ambiguity v_borchert@despammed.com (Volker Borchert) - 2016-03-18 20:20 +0000
  Re: ExecutorService.shutdown ambiguity Kevin McMurtrie <mcmurtrie@pixelmemory.us> - 2016-03-19 23:07 -0700

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