Fair enough. But I have use a Component, since
AjaxSelfUpdatingTimerBehavioronly works on a component. Which means I have
to implement the abstract onRender() method. What's the minimum action my
onRender() needs to do, considering I just want an invisible component?
Or is there some other way to accomplish this automatic push of JavaScript
without re-rendering the entire page on every update?
From: Sven Meier <s...@meiers.net>
To: users@wicket.apache.org
Date: 05/06/2014 04:37 PM
Subject: Re: AjaxSelfUpdatingTimerBehavior.onPostProcessTarget()
Never Called
By overriding #onRender() you're preventing the component tag to be
written into the response.
Since wicket-ajax cannot find the markuo id in the DOM, it will not
perform the Ajax request.
Sven
On 05/06/2014 08:28 PM, Richard W. Adams wrote:
> The onPostProcessTarget() method of my AjaxSelfUpdatingTimerBehavior is
> not being called for some reason. Here's the code. I can see the start()
> method being called (when the user clicks my "Start" button), but
> onPostProcessTarget() is never invoked. What am I doing wrong? Do I need
> to use some different sort of timer?
>
>
//----------------------------------------------------------------------------------------------
> @Override protected void onRender(final MarkupStream stream) {
> /*
> * Does nothing. This component has no markup of its own.
> * It exists only to update the progress bar.
> */
> System.out.println("In ProgressBarUpdater.onRender()");
> stream.next(); // Keep Wicket from complaining about not
> advancing the markup stream
> }
>
//----------------------------------------------------------------------------------------------
> /**
> * Opens the Ricola progress bar & begins the polling. We don't
start
> the polling until
> * explicitly told to so 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) {
>
> final AjaxSelfUpdatingTimerBehavior behavior = new
> AjaxSelfUpdatingTimerBehavior(Duration.seconds(2)) {
> private static final long serialVersionUID = 1L;
>
> @Override protected void onPostProcessTarget(final
> AjaxRequestTarget ajax) {
>
> System.out.printf("In onPostProcessTarget()");
> super.onPostProcessTarget(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
> }
> }
> };
> add(behavior);
> ajax.addComponent(this);
> }
>
//----------------------------------------------------------------------------------------------
>
> Here's the markup for the ProgressBarUpdater, the component to which
these
> methods belong:
>
> <span wicket:id="progress-updater"></span>
>
>
>
> From: Martin Grigorov <mgrigo...@apache.org>
> To: "users@wicket.apache.org" <users@wicket.apache.org>
> Date: 05/05/2014 03:32 PM
> Subject: Re: Progress Bar
>
>
>
> Hi,
>
>
> On Mon, May 5, 2014 at 7:18 PM, Richard W. Adams <rwada...@up.com>
wrote:
>
>> 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.
>>
> Have you considered providing your own .css ?
>
https://github.com/wicketstuff/core/blob/wicket-6.x/jdk-1.6-parent/progressbar-parent/progressbar/src/main/java/org/wicketstuff/progressbar/ProgressBar.java#L109
>
>
>
>> 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?
>>
>>
>>
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