Re: Synchronization when collecting data from the EDT?

From	"John B. Matthews" <nospam@nospam.invalid>
Newsgroups	comp.lang.java.gui
Subject	Re: Synchronization when collecting data from the EDT?
Date	2011-06-07 13:38 -0400
Organization	The Wasteland
Message-ID	<nospam-1E20CE.13382907062011@news.aioe.org> (permalink)
References	(2 earlier) <8jPGp.40014$Vp.14760@newsfe14.iad> <nospam-0D155A.23474105062011@news.aioe.org> <TjZGp.40183$Vp.29218@newsfe14.iad> <nospam-7A4754.23033306062011@news.aioe.org> <islktt$kt1$1@dont-email.me>

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In article <islktt$kt1$1@dont-email.me>,
 Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> wrote:

> On 07/06/2011 05:03, John B. Matthews allegedly wrote:
> > Here's my (contrived) sscce. A javax.swing.Timer increments  an int 
> > at 100 Hz, while a java.util.TimerTask samples the value at 1 Hz. 
> > I'd like the API to be a little more explicit, but it does say that 
> > the calling thread blocks and the Runnable's dispatch "will happen 
> > after all pending events are processed."
> > 
[code elided]
> 
> John, is it intended that you didn't use a thread-safe producer/consumer
> queue (a mere LinkedList)? I would have thought one would be necessary,
> but since it touches upon the subject Knute brought to our attention,
> I'm wondering whether there's some kind of point involved.

I appreciate your insight on this. I'm afraid my example just 
recapitulates Knute's question without answering it: Does the 
invokeAndWait() API ensure correct synchronization when used as shown? 
I'm confident that the _implementation_ I examined is correct, as the 
relevant methods are synchronized. Sadly, I have a tendency to over-
read the API.

I can't find a Sun/Oracle example using invokeAndWait() dated later than 
2000, well after the advent of java.util.concurrent. Would it be correct 
to infer that using, say BlockingQueue, would obviate the need for 
invokeAndWait()?

> Also, the println(queue.getLast()) statement probably ought to go into
> the try/catch block, lest you want to risk a NoSuchElementException.

D'oh, I carelessly moved it out of the block before posting. Thanks.

-- 
John B. Matthews
trashgod at gmail dot com
<http://sites.google.com/site/drjohnbmatthews>

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Thread

Synchronization when collecting data from the EDT? Knute Johnson <nospam@knutejohnson.com> - 2011-06-04 17:38 -0700
  Re: Synchronization when collecting data from the EDT? Knute Johnson <nospam@knutejohnson.com> - 2011-06-04 17:50 -0700
  Re: Synchronization when collecting data from the EDT? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-06-05 17:52 +0200
    Re: Synchronization when collecting data from the EDT? Knute Johnson <nospam@knutejohnson.com> - 2011-06-05 10:47 -0700
      Re: Synchronization when collecting data from the EDT? "John B. Matthews" <nospam@nospam.invalid> - 2011-06-05 23:47 -0400
        Re: Synchronization when collecting data from the EDT? Knute Johnson <nospam@knutejohnson.com> - 2011-06-05 22:11 -0700
          Re: Synchronization when collecting data from the EDT? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-06-06 14:31 +0200
          Re: Synchronization when collecting data from the EDT? "John B. Matthews" <nospam@nospam.invalid> - 2011-06-06 23:03 -0400
            Re: Synchronization when collecting data from the EDT? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-06-07 18:51 +0200
              Re: Synchronization when collecting data from the EDT? "John B. Matthews" <nospam@nospam.invalid> - 2011-06-07 13:38 -0400
                Re: Synchronization when collecting data from the EDT? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-06-08 00:10 +0200
                Re: Synchronization when collecting data from the EDT? "John B. Matthews" <nospam@nospam.invalid> - 2011-06-07 23:51 -0400
                Re: Synchronization when collecting data from the EDT? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-06-10 01:17 +0200
                Re: Synchronization when collecting data from the EDT? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-06-10 01:25 +0200
                Re: Synchronization when collecting data from the EDT? "John B. Matthews" <nospam@nospam.invalid> - 2011-06-09 22:34 -0400
                Re: Synchronization when collecting data from the EDT? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-06-10 05:22 +0200
                Re: Synchronization when collecting data from the EDT? markspace <-@.> - 2011-06-10 08:04 -0700
                Re: Synchronization when collecting data from the EDT? "John B. Matthews" <nospam@nospam.invalid> - 2011-06-10 21:13 -0400
                Re: Synchronization when collecting data from the EDT? Knute Johnson <nospam@knutejohnson.com> - 2011-06-12 12:51 -0700
                Re: Synchronization when collecting data from the EDT? markspace <-@.> - 2011-06-07 23:31 -0700
                Re: Synchronization when collecting data from the EDT? Knute Johnson <nospam@knutejohnson.com> - 2011-06-08 23:07 -0700
                Re: Synchronization when collecting data from the EDT? "John B. Matthews" <nospam@nospam.invalid> - 2011-06-09 18:35 -0400
                Re: Synchronization when collecting data from the EDT? Knute Johnson <nospam@knutejohnson.com> - 2011-06-12 12:45 -0700
            Re: Synchronization when collecting data from the EDT? Knute Johnson <nospam@knutejohnson.com> - 2011-06-08 23:05 -0700
              Re: Synchronization when collecting data from the EDT? "John B. Matthews" <nospam@nospam.invalid> - 2011-06-09 14:35 -0400
  Re: Synchronization when collecting data from the EDT? Roedy Green <see_website@mindprod.com.invalid> - 2011-06-05 13:39 -0700
    Re: Synchronization when collecting data from the EDT? Knute Johnson <nospam@knutejohnson.com> - 2011-06-05 22:17 -0700
      Re: Synchronization when collecting data from the EDT? markspace <-@.> - 2011-06-07 14:51 -0700
  Re: Synchronization when collecting data from the EDT? markspace <-@.> - 2011-06-05 17:46 -0700
    Re: Synchronization when collecting data from the EDT? Knute Johnson <nospam@knutejohnson.com> - 2011-06-05 22:41 -0700
      Re: Synchronization when collecting data from the EDT? Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-06-06 14:35 +0200

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