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Re: To BlockingQueue or not to BlockingQueue?

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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.

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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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