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Re: To BlockingQueue or not to BlockingQueue?

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On 11/13/2015 10:29 AM, Eric Douglas wrote:
> On Friday, November 13, 2015 at 9:14:24 AM UTC-5, Eric Sosman wrote:
>> Short version: I wrote a simple submit-tasks-and-reap-results
>> class based on a ThreadPoolExecutor.  Initially it seemed I could
>> use an ExecutorCompletionService to manage the flow of work, but
>> that didn't pan out.  Then I tried having the tasks place their own
>> results on a BlockingQueue explicitly, but that didn't pan out either.
>> Eventually, I retrogressed all the way to using an ordinary Queue and
>> an old-fashioned synchronized/wait/notifyAll scheme.  I'm hoping for
>> some hints about how to use the java.util.concurrent classes better,
>> since they're more modern and fashionable.
>
> I'm certainly no expert on concurrency, and the only queue I've had to reference was EventQueue.invokeLater() to kick off a GUI screen (appears to do the same as SwingUtilities.invokeLater()?), but I did recently write a multithreaded method if it helps.
>
> I needed to call a method from the Google API, which goes out to the web so it could take a minute, without the GUI thread showing unresponsive.  So I created a Semaphore and assigned it 1 permit, then acquired a permit, then created a SwingWorker which creates a new thread on the doInBackground() which releases a permit when it's done.  Then I call the worker.execute(), then the semaphore.tryAcquire(), then the worker.get().  I don't know if this is proper or most efficient but it appears to be working.  You can set a timeout on the acquire methods, and they throw InterruptedException if your current thread is aborted.

     Thanks for your ideas.  I don't think they help my particular
situation, but I appreciate the input.

     FWIW, I think your Semaphore might be unnecessary. SwingWorker
has a done() method that is called (on the EDT) when the work finishes,
and you can call get() from inside that method -- but then, I may not
have understood exactly what you're doing.

     Thanks again!

-- 
esosman@comcast-dot-net.invalid
"Don't be afraid of work. Make work afraid of you." -- TLM

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To BlockingQueue or not to BlockingQueue? Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-11-13 09:13 -0500
  Re: To BlockingQueue or not to BlockingQueue? Eric Douglas <e.d.programmer@gmail.com> - 2015-11-13 07:29 -0800
    Re: To BlockingQueue or not to BlockingQueue? Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-11-13 10:41 -0500
      Re: To BlockingQueue or not to BlockingQueue? Eric Douglas <e.d.programmer@gmail.com> - 2015-11-13 07:57 -0800
  Re: To BlockingQueue or not to BlockingQueue? Kevin McMurtrie <mcmurtrie@pixelmemory.us> - 2015-11-13 16:56 -0800
    Re: To BlockingQueue or not to BlockingQueue? Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-11-14 17:08 -0500
  Re: To BlockingQueue or not to BlockingQueue? Arne Vajhøj <arne@vajhoej.dk> - 2015-11-13 21:40 -0500
    Re: To BlockingQueue or not to BlockingQueue? Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-11-14 17:24 -0500
      Re: To BlockingQueue or not to BlockingQueue? Arne Vajhøj <arne@vajhoej.dk> - 2015-11-14 19:13 -0500
  Re: To BlockingQueue or not to BlockingQueue? Steven Simpson <ss@my.domain.invalid> - 2015-11-15 10:37 +0000
  Re: To BlockingQueue or not to BlockingQueue? Sebastian <news@seyweiler.dyndns.org> - 2015-11-16 01:00 +0100

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