Redirect Vaadin App - redirect

Question

I am currently hosting my vaadin app on openshift. My main website redirects to the vaadin app when the login button is clicked. The first thing the user sees is the login page
I have 2 buttons on my website, a free trial button and a login button, and I have 2 different classes in my vaadin app, a login class and a free trial class.
How can I make the login button redirect to the login class of my vaadin app and the free trial button redirect to the free trial class of my vaadin app?
This is what it currently looks like:
#Theme("mytheme")
#Widgetset("com.example.myapp.MyAppWidgetset")
#PreserveOnRefresh
public class MyUI extends UI {
#WebServlet(urlPatterns = "/*", name = "MyUIServlet", asyncSupported = true)
#VaadinServletConfiguration(ui = MyUI.class, productionMode = false)
public static class MyUIServlet extends VaadinServlet {
}
#Override
protected void init(VaadinRequest vaadinRequest) {
login();
}

Answer 1

You can use the Navigator as Chris M said, or you can try to implement an event driven architecture. I implemented a project like that using Vaadin too with Google Guava.
Here you can find some examples of how to use Google Guava if you are interested.
http://codingjunkie.net/guava-eventbus/
Below you can find some code fragments of my implementation:
// Using guava
final Button signin = new Button(
Lang.getMessage("login.signin"),
eventClick -> {BarsEventBus.post(new UserLoginRequestedEvent(
username.getValue(), password.getValue()));});
//Using Navigator, I also used spring here, so the registration view is a Spring View
final Button register = new Button(
Lang.getMessage("login.registration"),
clickEvent -> {getUI().getNavigator().navigateTo(ViewToken.REGISTRO);}
);
#UIScope
#SpringView(name = ViewToken.REGISTRO)
public class RegistrationView extends VerticalLayout implements View {...}
Please verify the code for the vaadin demo application. That code is having an example on how to handle it too. Find it here:
https://github.com/vaadin/dashboard-demo

Answer 2

You could pass in a parameter to your request and use a UI provider to serve the UI depending on this parameter.
See here.
Example:
public class DifferentFeaturesForDifferentClients extends UIProvider {
#Override
public Class<? extends UI> getUIClass(UIClassSelectionEvent event) {
if ("trial".equalsIgnoreCase(event.getRequest().getParameter("app-type"))) {
return TrialUI.class;
} else {
return LognUI.class;
}
}
}
web.xml:
<servlet>
<servlet-name>My Vaadin App</servlet-name>
<servlet-class>com.vaadin.server.VaadinServlet</servlet-class>
<init-param>
<description>Vaadin UI</description>
<param-name>UIProvider</param-name>
<param-value>com.example.myexampleproject.DifferentFeaturesForDifferentClients</param-value>
</init-param>
</servlet>
And then in your main websites html code:
<form>
<input type="submit" name="app-type" value="Trial" formaction="/your/vaadin/url" formmethod="post">
<input type="submit" name="app-type" value="Login" formaction="/your/vaadin/url" formmethod="post">
<!-- Alternative using button tag (better for customization, but no IE < 9) -->
<button name="app-type" value="trial" type="submit">Trial</button>
<button name="app-type" value="login" type="submit">Login</button>
</form>

Answer 3

I now understand what you were truing to do. You can do this quite easily. You need to cast the VaadinRequest into a VaadinServletRequest. The reason it passes a VaadinRequest rather than an VaadinServletRequest is so you can deploy your application as a portlet too. In that case you would need to cast it to VaadinPortletRequest instead. Then you can use the serverName provided by the user.
#Override
protected void init(VaadinRequest vaadinRequest) {
VaadinServletRequest req = (VaadinServletRequest) vaadinRequest;
String serverName = req.getServerName();
if (serverName.equals("www.login.mywebsite.com"))
{
login();
}
else
{
trial();
}
}