Re: Threads, waiting for last one to finish
On 1/13/13 7:35 PM, Arne Vajh?j wrote:
On 1/13/2013 2:39 AM, Kevin McMurtrie wrote:
In article <kcq2ap$m4o$1@dont-email.me>,
markspace <markspace@nospam.nospam> wrote:
On 1/11/2013 1:56 PM, Roedy Green wrote:
I have 25 threads that start at once. I need to wait until the last
one completes. Is there a better way to handle that than using a
ThreadPoolExecutor which seems overkill.
The Executors class has convenience methods to make thread pools easier
to use.
ExecutorService es = Executors.newFixedThreadPool( 25 );
// submit jobs here
es.shutdown();
The shutdown() will wait for all jobs to finish. I don't think you can
get easier than that. It's two lines of code!
The Executor classes are horribly buggy. Pool size adjustment, idle
timeouts, and shutdown sequences do NOT work. Some of the features are
impossible to implement efficiently so Sun instead chose to implement
them incorrectly.
For an Executor, it would be more correct to iterate through all the
Future or Callable objects returned and ask for their result.
Can you be more specific about when shutdown and await does
not work?
Arne
I am also interested. However, I will say that I would have used the
ExecutorService and simply used the Future objects to wait for
completion of all tasks. This has the added benefit that you can
actually process the results of the Callables in a single thread, rather
than have them try to update some shared data structure. Using the
Future result is inherently easier to get correct.
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