Out of sync errors with any polling-based components

Vaadin 6 / 7 / 8 Framework UI
1

Hello,

I am having an issue with Out of Sync errors. In my application, there exists a side panel in which I have buttons that update another panel with information related to the button the user clicks on. I’ve recently upgraded to the the nightly build of vaadin-6.5.0.nightly-20110107-c16808.jar and I’ve noticed that “Out of Sync” errors are occurring when I click between the buttons too fast. When I click a button the following behaviour takes place:

  1. Clear out the vertical layout for the information panel using layout.removeAllComponents();
  2. Pull the information related to the button and add components to the layout.

The problem is that for polling components - if the components are added to the layout and then I click another button which removes the components before the server finishes sending an update to the client, an “out of sync” error appears. I am using two different polling components - a custom component that I’ve built and I’m also using the SuperImmediateTextField (a custom component built by one of the folks at Vaadin).

Here is a screenshot of the portion of the application that is experiences this problem. The buttons are on the left side:

The code related to polling for my custom component is below:



    @Override
    protected void onAttach() {
        super.onAttach();
        if (pollerSuspendedDueDetach) {
            poller.run();
        }
    }

    @Override
    protected void onDetach() {
        super.onDetach();
        poller.cancel();
        pollerSuspendedDueDetach = true;
    }

    class Poller extends Timer {

        @Override
        public void run() {

            if (refreshCount > MAX_REFRESH_COUNT) {
                poller.cancel();
                return;
            }
            
            // Just send something, to trigger the server side event.
            client.updateVariable(client.getPid(getElement()),
                    VARIABLE_REFRESH_EVENT, 0, false);
            client.sendPendingVariableChanges();
            refreshCount++;
            
        }
    }

The code related to polling for the SuperImmediateTextField is below:


   private Timer newTimer() {
        return new Timer() {
            public void run() {
                sendSuperImmediateEvent();
                timer = null;
            }
        };
    }

    public void sendSuperImmediateEvent() {
        client.updateVariable(client.getPid(this), PROPERTY_KEYPRESSED, true,
                false);
        client.updateVariable(client.getPid(this), "text", getText(), false);
        client.sendPendingVariableChanges();
    }

    @Override
    protected void onDetach() {
        super.onDetach();

        if (timer != null) {
            timer.cancel();
        }
    }

I believe the “onDetach()” should take care of stopping the “polling” from occurring and stop any further server-client updates to be sent. Were additional “out of sync” tests added to Vaadin as I do not remember having this problem before (I was using Vaadin 6.4.3 previously) and if so, is there a way around this?

Thanks for you help,
Ajay