I assume that means we can't store non-serializable objects in the session? This is sounding like a serious deficiency in Wicket's architecture...
From: Francois Meillet <francois.meil...@gmail.com> To: users@wicket.apache.org Date: 05/06/2014 08:48 AM Subject: Re: Application Scope sessions are serialised François Meillet Formation Wicket - Développement Wicket Le 6 mai 2014 à 15:28, Richard W. Adams <rwada...@up.com> a écrit : > One more question: Since each task is associated with a single user, would > it make more sense to create a task map in Session scope? Or will Wicket > try to serialize a map we put into the session? > > > > > From: Martin Grigorov <mgrigo...@apache.org> > To: "users@wicket.apache.org" <users@wicket.apache.org> > Date: 05/06/2014 08:06 AM > Subject: Re: Application Scope > > > > Please don't change the thread subject for all your answers. This confuses > the threading support in some mail clients. > > I meant *My*Application, i.e. *Your*Application. > Add this method and map/associate all tasks that your run to some id/key. > Serialize the key and later get a reference to the FutureTask with > something like: > YourApp.get().getTasks().get(theKey).isDone()/.isCanceled()/... > > Martin Grigorov > Wicket Training and Consulting > > > On Tue, May 6, 2014 at 2:50 PM, Richard W. Adams <rwada...@up.com> wrote: > >> Are you referring to org.apache.wicket.Application? I don't see a >> getTasksMap() method there. We use Wicket 1.4.17 & our company will not >> allow us to upgrade to newer versions). If getTasksMap() is unavailable > in >> 1.4.17, could Application.getSharedResources() be used in a similar way? >> >> >> >> >> From: Martin Grigorov <mgrigo...@apache.org> >> To: "users@wicket.apache.org" <users@wicket.apache.org> >> Date: 05/06/2014 07:26 AM >> Subject: Re: Background Threading >> >> >> >> Hi, >> >> You can put the tasks in an application scoped structure (e.g. >> MyApplication.get().getTasksMap()) and use a serializable key. >> >> Martin Grigorov >> Wicket Training and Consulting >> >> >> On Tue, May 6, 2014 at 2:11 PM, Richard W. Adams <rwada...@up.com> > wrote: >> >>> Interesting approach. Our use case is more complex, as it runs a >>> background task in a separate thread. Our task has three basic >>> requirements. It must: >>> >>> 1. Be cancellable. >>> >>> 2. Report its outcome (success/failure/warning). >>> >>> 3. Report incremental progress. >>> >>> Our fundamental problem is not how to display the progress bar, it's > how >>> to determine the outcome of the background thread. That's an >> unexpectedly >>> a tough nut to crack. The vast majority of examples we've seen use the >>> Runnable interface (which doesn't help us, as it can't be canceled or >>> return a value), rather than Callable interface (which meets our > needs, >>> but doesn't seem to play well with Wicket) >>> >>> >>> >>> >>> From: Colin Rogers <colin.rog...@objectconsulting.com.au> >>> To: "users@wicket.apache.org" <users@wicket.apache.org> >>> Date: 05/05/2014 08:14 PM >>> Subject: RE: Progress Bar >>> >>> >>> >>> There is a pretty nifty, jquery based progress bar, in > wicket-jquery-ui >>> library... >>> >>> >> > http://www.7thweb.net/wicket-jquery-ui/progressbar/DefaultProgressBarPage >>> >>> Cheers, >>> Col. >>> >>> -----Original Message----- >>> From: Richard W. Adams [mailto:rwada...@up.com] >>> Sent: Tuesday, 6 May 2014 3:19 AM >>> To: users@wicket.apache.org >>> Subject: Progress Bar >>> >>> We have a requirement to implement a progress bar for long-running >> server >>> operations. We can't use the code at >>> https://github.com/wicketstuff/core/wiki/Progressbar, because it > doesn't >>> meet our corporate user interface look-and-feel standards. >>> >>> So, we started our own implementation. Our test page contains these >>> methods below (the TestExecutor below class implements >>> Callable<ExecutorResult>). >>> >>> >>> >> >> > //---------------------------------------------------------------------------------------------- >>> private Component createButton() { >>> return new AjaxButton("start-button") { >>> private static final long serialVersionUID = -1; >>> >>> @Override protected void onSubmit(final >> AjaxRequestTarget >>> ajax, final Form<?> form) { >>> >>> final ExecutorService service = Executors. >>> newSingleThreadExecutor(); >>> try { >>> final ProgressBarTestPage page = >>> ProgressBarTestPage.this; >>> final TransactionData data = new >>> TransactionData (page.getId(), false); >>> final TestExecutor executor = new >>> TestExecutor(data, getPermissions()); >>> >>> executor.addListener(page); // >> Request >>> notification when done >>> future = service.submit(executor); // >>> Begin execution >>> progressBarUpdater.start(ajax, >> executor); >>> // Start polling for progress >>> >>> } catch (final Exception ex) { >>> throw new RuntimeException(ex); >>> } >>> service.shutdown(); // Terminate > gracefully >>> (VM probably >>> } // won't exit if we fail to do >> this) >>> }; >>> } >>> >>> >> >> > //---------------------------------------------------------------------------------------------- >>> /** >>> Observer Pattern method to let us know when the task is done so we >> can >>> check how things went. >>> */ >>> @Override public void executionComplete(final EnmCallableExecutor >>> executor) { >>> >>> try { >>> if (!future.isCancelled()) { // >>> Unless execution was canceled >>> final ExecutorResult result = future.get(); // >>> Get the outcome >>> System.out.println(result); >>> /* >>> * TODO: Show success or error message >>> */ >>> } >>> } catch (final Exception ex) { >>> ex.printStackTrace(); >>> } >>> } >>> >>> The ProgessBarUpdater class has this method: >>> >>> >>> >> >> > //---------------------------------------------------------------------------------------------- >>> /** >>> * Displays the progress bar & begins the polling. We don't start >> the >>> polling until >>> * explicitly told to do, for efficiency purposes. >>> * @param ajax The Ajax request wrapper. >>> * @param reporter The object to query for progress data. >>> */ >>> public void start(final AjaxRequestTarget ajax, final ProgressReporter >>> reporter) { >>> >>> add(new AjaxSelfUpdatingTimerBehavior(Duration.seconds(2)) { >>> private static final long serialVersionUID = 1L; >>> >>> @Override protected void onPostProcessTarget(final >>> AjaxRequestTarget ajax) { >>> >>> final Progress progress = >> reporter.getProgress(); >>> final String script = // > Build >>> script to update >>> ProgressScript.build(progress); // >>> progress bar >>> ajax.appendJavascript(script); >>> if (progress == null) { // If >>> operation is finished >>> final ProgressBarUpdater updater = >>> ProgressBarUpdater.this; >>> updater.remove(this); // >>> Stop timer to prevent >>> ajax.addComponent(updater); // >> pointless >>> polling >>> } >>> } >>> }); >>> ajax.addComponent(this); >>> } >>> >>> The page also contains a Future object so we can check the result > after >>> the thread finishes: >>> >>> private Future<ExecutorResult> future; >>> >>> __________________________________________ >>> >>> Having said all that, here's the problem: When I click the page's >> button, >>> Wicket throws this error: >>> >>> Unable to serialize class: java.util.concurrent.FutureTask >>> >>> The FutureTask object, I believe, is coming from the service.submit > call >>> whose return value we store in our Future variable. >>> >>> Does anyone know how to get around this roadblock? >>> >>> >>> >>> ** >>> >>> This email and any attachments may contain information that is >>> confidential and/or privileged for the sole use of the intended >> recipient. >>> Any use, review, disclosure, copying, distribution or reliance by >> others, >>> and any forwarding of this email or its contents, without the express >>> permission of the sender is strictly prohibited by law. 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