Examples of com.vaadin.ui.UI

com.vaadin.ui.UI
The topmost component in any component hierarchy. There is one UI for every Vaadin instance in a browser window. A UI may either represent an entire browser window (or tab) or some part of a html page where a Vaadin application is embedded.
The UI is the server side entry point for various client side features that are not represented as components added to a layout, e.g notifications, sub windows, and executing javascript in the browser.

When a new UI instance is needed, typically because the user opens a URL in a browser window which points to e.g. {@link VaadinServlet}, all {@link UIProvider}s registered to the current {@link VaadinSession} arequeried for the UI class that should be used. The selection is by default based on the UI init parameter from web.xml.

After a UI has been created by the application, it is initialized using {@link #init(VaadinRequest)}. This method is intended to be overridden by the developer to add components to the user interface and initialize non-component functionality. The component hierarchy must be initialized by passing a {@link Component} with the main layout or other content of the viewto {@link #setContent(Component)} or to the constructor of the UI.
@see #init(VaadinRequest) @see UIProvider @since 7.0

        control = EasyMock.createStrictControl();


        session = new AlwaysLockedVaadinSession(
                control.createMock(VaadinService.class));


        ui = new UI() {
            @Override
            protected void init(VaadinRequest request) {
            }
        };
        content = new CssLayout();

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        String uiId = matcher.group(1);
        String cid = matcher.group(2);
        String key = matcher.group(3);


        session.lock();
        UI ui;
        ClientConnector connector;
        try {
            ui = session.getUIById(Integer.parseInt(uiId));
            if (ui == null) {
                return error(request, response,
                        "Ignoring connector request for no-existent root "
                                + uiId);
            }


            connector = ui.getConnectorTracker().getConnector(cid);
            if (connector == null) {
                return error(request, response,
                        "Ignoring connector request for no-existent connector "
                                + cid + " in root " + uiId);
            }

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        String embedId = ui.getEmbedId();
        if (embedId != null) {
            Integer previousUiId = embedIdMap.put(embedId, uiId);
            if (previousUiId != null) {
                UI previousUi = uIs.get(previousUiId);
                assert previousUi != null
                        && embedId.equals(previousUi.getEmbedId()) : "UI id map and embed id map not in sync";


                // Will fire cleanup events at the end of the request handling.
                previousUi.close();
            }
        }
    }

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     * time. Otherwise, writes a HTTP Not Found error to the response.
     */
    @Override
    public boolean synchronizedHandleRequest(VaadinSession session,
            VaadinRequest request, VaadinResponse response) throws IOException {
        UI ui = session.getService().findUI(request);
        if (ui != null) {
            ui.setLastHeartbeatTimestamp(System.currentTimeMillis());
            // Ensure that the browser does not cache heartbeat responses.
            // iOS 6 Safari requires this (#10370)
            response.setHeader("Cache-Control", "no-cache");
            // If Content-Type is not set, browsers assume text/html and may
            // complain about the empty response body (#12182)

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        VaadinSession session = VaadinSession.getForSession(this,
                request.getWrappedSession());


        // Get UI id from the request
        String uiIdString = request.getParameter(UIConstants.UI_ID_PARAMETER);
        UI ui = null;
        if (uiIdString != null && session != null) {
            int uiId = Integer.parseInt(uiIdString);
            ui = session.getUIById(uiId);
        }

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                .getPortletRequest();
        PortletResponse portletResponse = ((VaadinPortletResponse) response)
                .getPortletResponse();


        // Finds the right UI
        UI uI = null;
        if (ServletPortletHelper.isUIDLRequest(request)) {
            uI = session.getService().findUI(request);
        }


        if (portletRequest instanceof RenderRequest) {

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        ClientConnector source;
        StreamVariable streamVariable;


        session.lock();
        try {
            UI uI = session.getUIById(Integer.parseInt(uiId));
            UI.setCurrent(uI);


            streamVariable = uI.getConnectorTracker().getStreamVariable(
                    connectorId, variableName);
            String secKey = uI.getConnectorTracker().getSeckey(streamVariable);
            if (!secKey.equals(parts[3])) {
                // TODO Should rethink error handling
                return true;
            }


            source = uI.getConnectorTracker().getConnector(connectorId);
        } finally {
            session.unlock();
        }


        String contentType = request.getContentType();

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        }
        session.lock();
        Map<Class<?>, CurrentInstance> oldInstances = null;
        DownloadStream stream = null;
        try {
            UI ui = session.getUIById(Integer.parseInt(uiid));
            if (ui == null) {
                return error(request, response, "No UI found for id  " + uiid);
            }
            oldInstances = CurrentInstance.setCurrent(ui);
            ConnectorResource resource;

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                                msg.getSessionExpiredMessage(), null,
                                msg.getSessionExpiredURL()));
                return;
            }


            UI ui = null;
            session.lock();
            try {
                ui = service.findUI(vaadinRequest);
                assert UI.getCurrent() == ui;


                if (ui == null) {
                    sendNotificationAndDisconnect(resource,
                            UidlRequestHandler.getUINotFoundErrorJSON(service,
                                    vaadinRequest));
                } else {
                    callback.run(resource, ui);
                }
            } catch (final IOException e) {
                callErrorHandler(session, e);
            } catch (final Exception e) {
                SystemMessages msg = service.getSystemMessages(
                        ServletPortletHelper.findLocale(null, null,
                                vaadinRequest), vaadinRequest);


                AtmosphereResource errorResource = resource;
                if (ui != null && ui.getPushConnection() != null) {
                    // We MUST use the opened push connection if there is one.
                    // Otherwise we will write the response to the wrong request
                    // when using streaming (the client -> server request
                    // instead of the opened push channel)
                    errorResource = ((AtmospherePushConnection) ui
                            .getPushConnection()).getResource();
                }


                sendNotificationAndDisconnect(
                        errorResource,

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                            "Session expired before push was disconnected. This should never happen",
                            e);
            return;
        }


        UI ui = null;
        session.lock();
        try {
            VaadinSession.setCurrent(session);
            // Sets UI.currentInstance
            ui = service.findUI(vaadinRequest);
            if (ui == null) {
                /*
                 * UI not found, could be because FF has asynchronously closed
                 * the websocket connection and Atmosphere has already done
                 * cleanup of the request attributes.
                 * 
                 * In that case, we still have a chance of finding the right UI
                 * by iterating through the UIs in the session looking for one
                 * using the same AtmosphereResource.
                 */
                ui = findUiUsingResource(resource, session.getUIs());


                if (ui == null) {
                    getLogger()
                            .log(Level.SEVERE,
                                    "Could not get UI. This should never happen,"
                                            + " except when reloading in Firefox -"
                                            + " see http://dev.vaadin.com/ticket/14251.");
                    return;
                } else {
                    getLogger()
                            .log(Level.INFO,
                                    "No UI was found based on data in the request,"
                                            + " but a slower lookup based on the AtmosphereResource succeeded."
                                            + " See http://dev.vaadin.com/ticket/14251 for more details.");
                }
            }


            PushMode pushMode = ui.getPushConfiguration().getPushMode();
            AtmospherePushConnection pushConnection = getConnectionForUI(ui);


            String id = resource.uuid();


            if (pushConnection == null) {

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