JavaEE with Vaadin - Workshop
0 likes1,076 views
The document outlines an application architecture utilizing Vaadin with Java EE 7, highlighting various Java specifications, including the Java Persistence API (JPA) and Enterprise JavaBeans (EJB). It describes the structure of customer and invoice entities, as well as the use of Context and Dependency Injection (CDI) for managing dependencies within the application. Additionally, it includes interfaces and classes related to customer services and presentation logic for a web-based UI framework.
JavaEE with Vaadin - Workshop
- 1. Vaadin with Java EE 7
- 5. Collection of Java Specification Requests (JSRs)
- 6. Collection of Java Specification Requests (JSRs) Implemented by app servers
- 9. Do you know some Java EE specs?
- 10. Java Persistence API 2.1 (JPA) (JSR-338)
- 11. Java Persistence API 2.1 (JPA) (JSR-338) Enterprise Java Beans 3.2 (EJB) (JSR-345)
- 12. Java Persistence API 2.1 (JPA) (JSR-338) Enterprise Java Beans 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340)
- 13. Java Persistence API 2.1 (JPA) (JSR-338) Enterprise Java Beans 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Context and Dependency Injection 1.2(CDI) (JSR-340)
- 14. Java Persistence API 2.1 (JPA) (JSR-338) Enterprise Java Beans 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Context and Dependency Injection 1.2(CDI) (JSR-340) Interceptors 1.2 (JSR-318)
- 15. Java Persistence API 2.1 (JPA) (JSR-338) Enterprise Java Beans 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Context and Dependency Injection 1.2(CDI) (JSR-340) Interceptors 1.2 (JSR-318) Java Transaction API 1.2 (JTA) (JSR-907)
- 16. Java Persistence API 2.1 (JPA)
- 17. Customer @Entity ______________________________ @Id @AutoGenerated Long id; @Column(nullable = false) String name; Date birthdate;
- 18. Customer @Entity ______________________________ Customer Id name birthdate 1 Alex 07.02.1984 2 John 18.2.1992 @Id @AutoGenerated Long id; @Column(nullable = false) String name; Date birthdate;
- 19. Customer @Id @AutoGenerated Long id; @Column(nullable = false) String name; Date birthdate; @OneToMany(mappedBy=“customer”) List<Invoice> invoices; @Entity ______________________________ Customer Id name birthdate 1 Alex 07.02.1984 2 John 18.2.1992 Invoice Id customer number 1 1 123 2 1 124
- 20. Enterprise Java Beans 3.2 (EJB)
- 21. Business layer services Enterprise Java Beans
- 22. Business layer services @local and @remote Enterprise Java Beans
- 23. Business layer services @local and @remote Enterprise Java Beans Transaction boundaries
- 28. @Local public interface CustomerService { void storeCustomers(Collection<Customer> customers); void removeCustomers(Collection<Customer> customers); Collection<Customer> getAllCustomers() Optional<Customer> getCustomerByName(String name); }
- 29. @Stateless public class CustomerServiceBean implements CustomerService { @PersistenceContext private EntityManager em; public void storeCustomers(Collection<Customer> cu) { cu.forEach(c -> storeCustomer(c)); } public void storeCustomer(Customer c) { em.persist(c); } }
- 30. Context and Dependency Injection 1.2 (CDI)
- 31. Instead of saying new say @Inject Context and Dependency Injection
- 32. Instead of saying new say @Inject Decouples code and lets container manage dependencies Context and Dependency Injection
- 33. Object references by scopes Context and Dependency Injection
- 34. @ApplicationScoped @SessionScoped @RequestScoped Context and Dependency Injection Object references by scopes
- 35. @UIScoped @ViewScoped Context and Dependency Injection @ApplicationScoped @SessionScoped @RequestScoped Object references by scopes
- 38. @Stateless CustomerService _________________ @EJB InvoiceService invoices; @UIScoped AppUI _________________ @EJB CustomerService service; @Inject MainMenu mainMenu; @Inject User currentUser; @UIScoped MainMenu _________________ @Inject Event<MenuEvent> menuEventSource; @Stateless InvoiceService
- 39. @UIScoped AppUI _____________________________ @Inject private MainMenu menu; @Inject private ViewManager viewMgr; @Inject private User loggedInUser; <<UIScope>> MainMenu ViewManager <<SessionScope>> User
- 40. <<UIScope>> MenuBar Footer ViewManager <<SessionScope>> User @UIScoped AppUI _____________________________ @Inject private MenuBar menu; @Inject private ViewManager viewMgr; @Inject private User loggedInUser; <<UIScope>> MenuBar Footer ViewManager <<UIScope>> MenuBar Footer ViewManager <<UIScope>> MenuBar ViewManager
- 41. Integration to EE through Vaadin CDI
- 42. Managed UI with @CDIUI
- 43. Managed UI with @CDIUI Allows injection with @Inject and @EJB
- 44. Easily reference EE objects Allows injection with @Inject and @EJB Managed UI with @CDIUI
- 45. @CDIUI(“”) public class AppUI extends UI { }
- 46. @CDIUI(“”) public class AppUI extends UI { @Inject private MainMenu mainMenu; @Inject private User currentUser; @Inject private ViewManager viewManager; public void init(VaadinRequest request) { VerticalLayout layout = new VerticalLayout(); layout.addComponent(mainMenu); setContent(layout); } }
- 47. @UIScoped
- 48. @UIScoped UI specific bean references
- 49. @UIScoped UI specific bean references CDI context for mapping beans per UI
- 50. @UIScoped UI specific bean references CDI context for mapping beans per UI @UIScoped
- 51. @UIScoped public class MainMenu extends CustomComponent { }
- 52. @UIScoped public class MainMenu extends CustomComponent { @Inject private Event<NavigationEvent> eventSource; protected void onMenuItemClicked(MenuItem item) { eventSource.fireEvent(new NavigationEvent(item)); } }
- 53. @CDIUI(“”) public class AppUI extends UI { … protected void onNavigationEvent(@Observes NavigationEvent event) { viewMgr.navigateTo(event.getView()); } }
- 57. public interface CustomerView extends ApplicationView<CustomerViewPresenter> { }
- 58. public interface CustomerView extends ApplicationView<CustomerViewPresenter> { void populateCustomers(Collection<Customer> customers); void openEditorFor(Customer customer); void closeEditor(); void removeTableSelection(); }
- 60. @ViewScoped public class CustomerViewPresenter extends AbstractPresenter<CustomerView> { }
- 61. @ViewScoped public class CustomerViewPresenter extends AbstractPresenter<CustomerView> { @EJB private CustomerService customerService; @Override protected void onViewEnter() { getView().populateCustomers(customerService.getAllCustomers()); } }
- 62. @ViewScoped public class CustomerViewPresenter extends AbstractPresenter<CustomerView> { @EJB private CustomerService customerService; @Override protected void onViewEnter() { getView().populateCustomers(customerService.getAllCustomers()); } public void onCustomerSaved(@Observes CustomerSavedEvent event) { … } public void onCustomerRemoved(@Observes CustomerRemovedEvent event) { … } public void onCustomerSelected(@Observes CustomerSelectedEvent event) { … } }
- 64. @Local public interface CustomerService { void storeCustomers(Collection<Customer> customers); void removeCustomers(Collection<Customer> customers); Collection<Customer> getAllCustomers(); Optional<Customer> getCustomerByUsername(String username); }
- 65. Application Architecture @Stateless @TransactionAttribute(TransactionAttributeType.REQUIRED) public class CustomerServiceBean implements CustomerService { @PersistenceContext(unitName = "appUnit") private EntityManager entityManager; @Override public void storeCustomers(Collection<Customer> customers) { customers.forEach(cu -> entityManager.merge(cu)); } @Override public Collection<Customer> getAllCustomers() { return entityManager.createQuery(query).getResultList(); } … }
- 67. Application Architecture @Entity public class Customer { @Id @AutoGenerated private Long id; private String name; @Temporal(DATE) private Date birthDate; public boolean isPersisted() { return id != null; } … }
- 68. <persistence-unit name="appUnit" transaction-type="JTA"> <jta-data-source>jdbc/app-backend</jta-data-source> <class>org.vaadin.example.backend.entity.Customer</class> <properties> <property name="…" … /> </properties> </persistence-unit>