Examples of com.vaadin.server.VaadinSession

com.vaadin.server.VaadinSession
Contains everything that Vaadin needs to store for a specific user. This is typically stored in a {@link HttpSession} or {@link PortletSession}, but others storage mechanisms might also be used.
Everything inside a {@link VaadinSession} should be serializable to ensurecompatibility with schemes using serialization for persisting the session data. @author Vaadin Ltd @since 7.0.0

     */
    public void accessSynchronously(Runnable runnable)
            throws UIDetachedException {
        Map<Class<?>, CurrentInstance> old = null;


        VaadinSession session = getSession();


        if (session == null) {
            throw new UIDetachedException();
        }


        VaadinService.verifyNoOtherSessionLocked(session);


        session.lock();
        try {
            if (getSession() == null) {
                // UI was detached after fetching the session but before we
                // acquired the lock.
                throw new UIDetachedException();
            }
            old = CurrentInstance.setCurrent(this);
            runnable.run();
        } finally {
            session.unlock();
            if (old != null) {
                CurrentInstance.restoreInstances(old);
            }
        }

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     *             therefore not be done)
     * @return a future that can be used to check for task completion and to
     *         cancel the task
     */
    public Future<Void> access(final Runnable runnable) {
        VaadinSession session = getSession();


        if (session == null) {
            throw new UIDetachedException();
        }


        return session.access(new ErrorHandlingRunnable() {
            @Override
            public void run() {
                accessSynchronously(runnable);
            }

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     * @see #getPushConfiguration()
     * 
     * @since 7.1
     */
    public void push() {
        VaadinSession session = getSession();


        if (session == null) {
            throw new UIDetachedException("Cannot push a detached UI");
        }
        assert session.hasLock();


        if (!getPushConfiguration().getPushMode().isEnabled()) {
            throw new IllegalStateException("Push not enabled");
        }
        assert pushConnection != null;


        /*
         * Purge the pending access queue as it might mark a connector as dirty
         * when the push would otherwise be ignored because there are no changes
         * to push.
         */
        session.getService().runPendingAccessTasks(session);


        if (!getConnectorTracker().hasDirtyConnectors()) {
            // Do not push if there is nothing to push
            return;
        }

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     */
    public void accessSynchronously(Runnable runnable)
            throws UIDetachedException {
        Map<Class<?>, CurrentInstance> old = null;


        VaadinSession session = getSession();


        if (session == null) {
            throw new UIDetachedException();
        }


        VaadinService.verifyNoOtherSessionLocked(session);


        session.lock();
        try {
            if (getSession() == null) {
                // UI was detached after fetching the session but before we
                // acquired the lock.
                throw new UIDetachedException();
            }
            old = CurrentInstance.setCurrent(this);
            runnable.run();
        } finally {
            session.unlock();
            if (old != null) {
                CurrentInstance.restoreInstances(old);
            }
        }

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     *             therefore not be done)
     * @return a future that can be used to check for task completion and to
     *         cancel the task
     */
    public Future<Void> access(final Runnable runnable) {
        VaadinSession session = getSession();


        if (session == null) {
            throw new UIDetachedException();
        }


        return session.access(new ErrorHandlingRunnable() {
            @Override
            public void run() {
                accessSynchronously(runnable);
            }

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     * @see #getPushConfiguration()
     * 
     * @since 7.1
     */
    public void push() {
        VaadinSession session = getSession();
        if (session != null) {
            assert session.hasLock();


            /*
             * Purge the pending access queue as it might mark a connector as
             * dirty when the push would otherwise be ignored because there are
             * no changes to push.
             */
            session.getService().runPendingAccessTasks(session);


            if (!getConnectorTracker().hasDirtyConnectors()) {
                // Do not push if there is nothing to push
                return;
            }

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        }
        HasComponents parent = getParent();
        if (parent != null) {
            return parent.getLocale();
        }
        final VaadinSession session = getSession();
        if (session != null) {
            return session.getLocale();
        }
        return null;
    }

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    /**
     * Sets the focus for this component if the component is {@link Focusable}.
     */
    protected void focus() {
        if (this instanceof Focusable) {
            final VaadinSession session = getSession();
            if (session != null) {
                getUI().setFocusedComponent((Focusable) this);
                delayedFocus = false;
            } else {
                delayedFocus = true;

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            return super.handleConnectorRequest(request, response, path);
        }


        DownloadStream stream;


        VaadinSession session = getSession();
        session.lock();
        try {
            List<URLReference> sources = getState().sources;


            int sourceIndex = Integer.parseInt(matcher.group(1));


            if (sourceIndex < 0 || sourceIndex >= sources.size()) {
                getLogger().log(Level.WARNING,
                        "Requested source index {0} is out of bounds",
                        sourceIndex);
                return false;
            }


            URLReference reference = sources.get(sourceIndex);
            ConnectorResource resource = (ConnectorResource) ResourceReference
                    .getResource(reference);
            stream = resource.getStream();
        } finally {
            session.unlock();
        }


        stream.writeResponse(request, response);
        return true;
    }

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    private void callWithUi(final AtmosphereResource resource,
            final PushEventCallback callback) {
        AtmosphereRequest req = resource.getRequest();
        VaadinServletRequest vaadinRequest = new VaadinServletRequest(req,
                service);
        VaadinSession session = null;


        service.requestStart(vaadinRequest, null);
        try {
            try {
                session = service.findVaadinSession(vaadinRequest);
            } catch (ServiceException e) {
                getLogger().log(Level.SEVERE,
                        "Could not get session. This should never happen", e);
                return;
            } catch (SessionExpiredException e) {
                SystemMessages msg = service.getSystemMessages(
                        ServletPortletHelper.findLocale(null, null,
                                vaadinRequest), vaadinRequest);
                sendNotificationAndDisconnect(
                        resource,
                        VaadinService.createCriticalNotificationJSON(
                                msg.getSessionExpiredCaption(),
                                msg.getSessionExpiredMessage(), null,
                                msg.getSessionExpiredURL()));
                return;
            }


            UI ui = null;
            session.lock();
            try {
                VaadinSession.setCurrent(session);
                // Sets UI.currentInstance
                ui = service.findUI(vaadinRequest);
                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,
                        VaadinService.createCriticalNotificationJSON(
                                msg.getInternalErrorCaption(),
                                msg.getInternalErrorMessage(), null,
                                msg.getInternalErrorURL()));
                callErrorHandler(session, e);
            } finally {
                try {
                    session.unlock();
                } catch (Exception e) {
                    getLogger().log(Level.WARNING,
                            "Error while unlocking session", e);
                    // can't call ErrorHandler, we (hopefully) don't have a lock
                }

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