Examples of com.vaadin.client.ApplicationConnection$CommunicationErrorHandler

com.vaadin.client.ApplicationConnection
Allows custom handling of communication errors.

                     * handled. E.g. hidden on start, removed in drophandler ->
                     * would flicker in case removed eagerly.
                     */
                    final ComponentConnector dragSource = currentDrag
                            .getTransferable().getDragSource();
                    final ApplicationConnection client = currentDropHandler
                            .getApplicationConnection();
                    Scheduler.get().scheduleFixedDelay(new RepeatingCommand() {
                        @Override
                        public boolean execute() {
                            if (!client.hasActiveRequest()) {
                                removeActiveDragSourceStyleName(dragSource);
                                return false;
                            }
                            return true;
                        }

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    private void doRequest(DragEventType drop) {
        if (currentDropHandler == null) {
            return;
        }
        ComponentConnector paintable = currentDropHandler.getConnector();
        ApplicationConnection client = currentDropHandler
                .getApplicationConnection();
        /*
         * For drag events we are using special id that are routed to
         * "drag service" which then again finds the corresponding DropHandler
         * on server side.
         * 
         * TODO add rest of the data in Transferable
         * 
         * TODO implement partial updates to Transferable (currently the whole
         * Transferable is sent on each request)
         */
        visitId++;
        client.updateVariable(ApplicationConstants.DRAG_AND_DROP_CONNECTOR_ID,
                "visitId", visitId, false);
        client.updateVariable(ApplicationConstants.DRAG_AND_DROP_CONNECTOR_ID,
                "eventId", currentDrag.getEventId(), false);
        client.updateVariable(ApplicationConstants.DRAG_AND_DROP_CONNECTOR_ID,
                "dhowner", paintable, false);


        VTransferable transferable = currentDrag.getTransferable();


        client.updateVariable(ApplicationConstants.DRAG_AND_DROP_CONNECTOR_ID,
                "component", transferable.getDragSource(), false);


        client.updateVariable(ApplicationConstants.DRAG_AND_DROP_CONNECTOR_ID,
                "type", drop.ordinal(), false);


        if (currentDrag.getCurrentGwtEvent() != null) {
            try {
                MouseEventDetails mouseEventDetails = MouseEventDetailsBuilder
                        .buildMouseEventDetails(currentDrag
                                .getCurrentGwtEvent());
                currentDrag.getDropDetails().put("mouseEvent",
                        mouseEventDetails.serialize());
            } catch (Exception e) {
                // NOP, (at least oophm on Safari) can't serialize html dd event
                // to mouseevent
            }
        } else {
            currentDrag.getDropDetails().put("mouseEvent", null);
        }
        client.updateVariable(ApplicationConstants.DRAG_AND_DROP_CONNECTOR_ID,
                "evt", currentDrag.getDropDetails(), false);


        client.updateVariable(ApplicationConstants.DRAG_AND_DROP_CONNECTOR_ID,
                "tra", transferable.getVariableMap(), true);


    }

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        return dragElement;
    }


    private void attachDragElement() {
        if (dragElement != null && dragElement.getParentElement() == null) {
            ApplicationConnection connection = getCurrentDragApplicationConnection();
            Element dragImageParent;
            if (connection == null) {
                VConsole.error("Could not determine ApplicationConnection for current drag operation. The drag image will likely look broken");
                dragImageParent = RootPanel.getBodyElement();
            } else {

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                /*
                 * Make a wild guess and use the first available
                 * ApplicationConnection. This is better than than leaving the
                 * exception completely unstyled...
                 */
                ApplicationConnection connection = ApplicationConfiguration
                        .getRunningApplications().get(0);
                owner = connection.getUIConnector().getWidget();
            }
            VNotification
                    .createNotification(VNotification.DELAY_FOREVER, owner)
                    .show("<h1>Uncaught client side exception</h1><br />"
                            + exceptionText, VNotification.CENTERED, "error");

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     * @return the overlay container element for the current
     *         {@link ApplicationConnection} or another element if the current
     *         {@link ApplicationConnection} cannot be determined.
     */
    public com.google.gwt.user.client.Element getOverlayContainer() {
        ApplicationConnection ac = getApplicationConnection();
        if (ac == null) {
            // could not figure out which one we belong to, styling will
            // probably fail
            Logger.getLogger(getClass().getSimpleName())
                    .log(Level.WARNING,

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