JavaCro'14 - Vaadin web application integration for Enterprise systems – Peter Lehto
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Vaadin is Java framework for rapid development of highly interactive HTML5-based web applications. Because of server-driven nature Vaadin can easily be integrated with server-side Java EE features such as EJBs and JPA. During this speech we will look in detail on how multi-view Vaadin applications are built and coupled with Java EE based business systems using Context and Dependency Injection (CDI). Important topics covered within the session are the best practices of developing Model-View-Presenter (MVP) based Vaadin views as well as the as pointers and guidelines on how to use Vaadin with Java EE. Attending the speech does not require thorough understanding of Java EE or web technologies in general.
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JavaCro'14 - Vaadin web application integration for Enterprise systems – Peter Lehto
- 4. How to get started? QA Context and Scope Authentication and Authorization
- 5. MVP pattern
- 8. Originally Model-View-Controller Originates from late 70’s SmallTalk-80 Controller is mediator between end user and application Model notifies about changes with Observer pattern MVP pattern
- 9. Taligent Model-View-Presenter Influenced by SmallTalk-80 Model, View, Presenter, Interactors, Commands, Selections Presenter orchestrates the structure, not the input MVP pattern
- 10. Dolphin Smalltalk Model-View-Presenter Simplified Taligent MVP Views handle input events initially Model may fire events Presenter handles the logic, not the user input control MVP pattern
- 11. Model-View-Presenter Presenter View Model Direct Association Indirect Association MVP pattern
- 12. “That’s not how you use MVP!” MVP pattern
- 14. What is the role of the Presenter? MVP pattern
- 16. Example EditorView - Button saveButton;! - Button cancelButton;! - FieldGroup personFieldGroup; - saveButtonClicked()! - cancelButtonClicked() ClickListener + buttonClicked() Structuring Vaadin Application
- 17. EditorView - Button saveButton;! - Button cancelButton;! - FieldGroup personFieldGroup; ClickListener Presenter + saveButtonClicked()! + cancelButtonClicked()! + buttonClicked() + commitChanges()! + discardChanges() ExampleStructuring Vaadin Application
- 18. EditorView + commitChanges()! + discardChanges() Example EditorView - Button saveButton;! - Button cancelButton;! - FieldGroup personFieldGroup; ClickListener Presenter + saveButtonClicked()! + cancelButtonClicked()! + buttonClicked() + commitChanges()! + discardChanges() Structuring Vaadin Application
- 19. Benefits of MVP Allows you to create unit and integration tests for your UI logic Abstracts your code to be more reusable Your UI logic is separated from the UI implementation Structuring Vaadin Application
- 21. Navigator Support for bookmarkable views and browser navigation Automatic URI fragment handling Built-in switching between views Views with Vaadin Navigator
- 22. public class DashboardView extends CustomComponent implements com.vaadin.navigator.View Views with Vaadin Navigator
- 23. public class MyNavigatorUI extends UI{! ! @Override! ! Protected void init(VaadinRequest request){! ! ! Navigator navigator = new Navigator(this, this); ! ! ! navigator.addView(“dashboard”, new DashboardView());! ! } ! }! Views with Vaadin Navigator
- 24. Activating a view programmatically UI.getCurrent().getNavigator().navigateTo("customers"); Views with Vaadin Navigator
- 25. http://localhost:8080/vaadin/#!customers ! #! : Navigator identifier customers : View name Navigating to a view via URL Views with Vaadin Navigator
- 26. ...but where is the view rendered? Views with Vaadin Navigator
- 28. public Navigator(UI ui, ComponentContainer container) public Navigator(UI ui, SingleComponentContainer container) public Navigator(UI ui, ViewDisplay viewDisplay) Views with Vaadin Navigator
- 29. Vaadin-CDI
- 32. Features Vaadin UI based context scope ! Vaadin Navigator Integration ! Easy JAAS Integration ! Role Based View Management Vaadin-CDI
- 33. @CDIUI public class MyVaadinUI extends UI Vaadin-CDI http://localhost:8080/vaadin/
- 34. @CDIUI(“myui”) public class MyVaadinUI extends UI Vaadin-CDI http://localhost:8080/vaadin/myui
- 35. @CDIUI public class MyVaadinUI extends UI { @Inject private MyBean bean; … } Vaadin-CDI
- 36. @CDIUI public class MyVaadinUI extends UI { ! @EJB private MyServiceEJB service; … } Vaadin-CDI
- 37. @CDIUI public class MyVaadinUI extends UI { ! @Inject private javax.enterprise.event.Event<MyEvent> myEvent; … myEvent.fire(new MyEvent()); } Vaadin-CDI
- 38. @CDIUI public class MyVaadinUI extends UI { … ! protected void onMyEvent(@Observes MyEvent myEvent) { } } Vaadin-CDI
- 39. @CDIView(“customers”) public class CustomerView extends CustomComponent implements View Vaadin-CDI http://localhost:8080/vaadin/#!customers
- 41. @CDIUI public class MyVaadinUI extends UI { ! @Inject private CDIViewProvider viewProvider; … navigator.addProvider(viewProvider); } UIProvider CDIViewProvider
- 42. UIProvider CDIViewProvider public class CDIViewProvider implements ViewProvider { ! @Inject private BeanManager beanManager; ! @Inject private AccessControl accessControl; ! … ! public String getViewName(String) { … } public View getView(String) { … } }
- 43. UIProvider CDIViewProvider public class CDIUIProvider extends DefaultUIProvider { ! public UI createInstance(UICreateEvent event) { … } public Class<? extends UI> getUIClass (UIClassSelectionEvent event) { … } }
- 44. UIProvider CDIViewProvider ContextDeployer @WebListener ! Is capable of bootstrapping Vaadin Servlet with CDIUIProvider ! Will validate deployment
- 46. Context and Scope VaadinServlet HttpSession VaadinSession UI 1 n 1 1 1 n 1 * EJB 1 * View/Presenter 1 *
- 47. Context and Scope UIScope Necessary to acquire UI specific component injections ! CDI context to map beans per UI instance ! @UIScoped
- 48. Context and Scope UIScope @CDIUI and @CDIView are @Stereotypes with @UIScoped ! CDI events are sent within the scope ! MVP Presenters and UI specific resources are marked as @UIScoped
- 50. Authentication and Authorization com.vaadin.cdi.access. AccessControl @RolesAllowed ! isUserSignedIn(), isUserInRole(String), getPrincipalName() ! Can be replaced with @Alternative
- 52. <dependency <groupId>com.vaadin</groupId> <artifactId>vaadin-cdi</artifactId> <version>1.0.0.alpha2</version> </dependency> ! <dependency org="com.vaadin" name="vaadin-cdi” rev=“1.0.0.alpha2” conf="default->default" /> How to get started?
- 53. Eclipse Download plugin from Martketplace How to get started?
- 54. IntelliJ IDEA Built-in support How to get started?
- 55. Netbeans Download plugin Netbeans Plugin Portal How to get started?