Thanks for finding that Listener use in ZoomToSelectedItemsPlugIn. I
tried it and it doesn't flash anymore.
regards,
Larry
On 6/15/07, Sascha L. Teichmann <[EMAIL PROTECTED]> wrote:
> In core the
>
> com.vividsolutions.jump.workbench.ui.zoom.ZoomToSelectedItemsPlugIn
>
> uses the ThreadQueue.Listener interface. But the code looks like it can
> cope with the 'slightly' shifted semantic.
>
> I would vote for stick a @deprecated tag (+ some explanations)
> to the respective methods and to the interface because code
> that uses these mechanisms is possibly not aware of the
> sophisticated difference between 'no running threads left'
> and 'all jobs done'.
>
> - Sascha
>
>
> Larry Becker schrieb:
> > Hi Sascha,
> >
> > Adding a 'wakeup' Runnable works great and is easier than using the
> > listener anyway.
> >
> > By the way, I couldn't find any other code using the Listener
> > interface, but I suppose there could be a Plug-in somewhere that does.
> > We should probably leave it out anyway since if we are leaving it in
> > for compatibility, it should actually be compatible. The easiest way
> > to find out if it is really needed by anyone but me might be to leave
> > it out and see if it breaks anyone's compile. The same applies to
> > getRunningThreads since it doesn't behave exactly like it did before
> > either.
> >
> > Anyway, thanks for the help. I'm able to determine the end of
> > rendering much more accurately now.
> >
> > regards,
> > Larry Becker
> >
> > On 6/15/07, Sascha L. Teichmann <[EMAIL PROTECTED]> wrote:
> >> Hello Larry,
> >>
> >> the version of the ThreadQueue is a bit outdated.
> >> The version you have has no getRunningThreads() method.
> >> This is need for compatibility. And there was a bug in
> >> remove(Listener) which is fixed by now.
> >> I attach the current ThreadQueue.
> >>
> >> Now to your problem:
> >>
> >> The Listeners are in for compatibility and you are right
> >> they get there kick when the WORKER_STAY_ALIVE_TIME has
> >> expired. But once again: These Listeners _do_ _not_ help
> >> you! You want to know when the last job has ended, not
> >> when there are no more running Threads. We discussed this
> >> already.
> >>
> >> I would suggest the following solution on your side
> >> to archive the desired effect:
> >>
> >> <code>
> >>
> >> Graphics2D destination = ... // from outer space
> >>
> >> LayerViewPanel layerViewPanel = ... // from outer space
> >>
> >> RenderingManager renderingManager =
> >> layerViewPanel.getRenderingManager();
> >>
> >> ThreadQueue defaultThreadQueue =
> >> renderingManager.getDefaultRendererThreadQueue();
> >>
> >> // add all the Renderer Runnables to the ThreadQueue
> >> renderingManager.renderAll();
> >>
> >> final boolean [] locked = { true };
> >>
> >> // because defaultThreadQueue does its jobs
> >> // one after each other append a 'wakeup' Runnable ...
> >>
> >> defaultThreadQueue.add(new Runnable() {
> >> public void run() {
> >> synchronized (locked) {
> >> locked[0] = false;
> >> locked.notify();
> >> }
> >> }
> >> });
> >>
> >> try {
> >> synchronized (locked) {
> >> // you could simply write
> >> // "while (locked[0]) locked.wait();"
> >> // but following is more defensive
> >> int count = 0;
> >> while (locked[0] && count++ < 10)
> >> locked.wait(10000L);
> >> }
> >> }
> >> catch (InterruptedException ie) {
> >> }
> >>
> >> renderingManager.copyTo(destination);
> >>
> >> </code>
> >>
> >> But as I said earlier, this only works on
> >> the defaultRenderingThreadQueue and therefore
> >> its only an interim solution. The
> >> WMS/DB ThreadQueue is private and a true
> >> parallel ThreadQueue.
> >>
> >> My goal is to add a renderAllSynchronized()
> >> to RenderingManager that used the above
> >> Runnable/unlock trick. The secret WMS/DB
> >> will be eliminated (or better the default one
> >> and the WMS/DB ThreadQueue will become the
> >> default). This is doable with the
> >> RunnableArrayList class I posted a while
> >> ago, which simulates the single thread
> >> default ThreadQueue. But one step after
> >> the other ...
> >>
> >> Regards, Sascha
> >>
> >>
> >> Larry Becker schrieb:
> >>> Sascha,
> >>>
> >>> I have reached a point where I need some help with the new
> >>> ThreadQueue implementation. I have modified my code that calls
> >>> getRunningThreads to use the Listener with the
> >>> allRunningThreadsFinished method instead. This was much cleaner and
> >>> worked fine until I replaced ThreadQueue with your version. The
> >>> problem I seem to be having is that the method doesn't fire until
> >>> after the 5 second WORKER_STAY_ALIVE_TIME has expired. Can you
> >>> explain what I should be doing or modify the code so that it fires
> >>> when there are no more jobs waiting?
> >>>
> >>> I have attached the version of ThreadQueue.java that I have been using
> >>> in case it is outdated.
> >>>
> >>> thanks,
> >>> Larry Becker
> >>>
> >>>
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