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Vaadin 7 - Java Enterprise Edition integration | PDF
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Vaadin 7 - Java Enterprise Edition integration

The document discusses integrating Vaadin with Java Enterprise Edition (EE). It describes using Context and Dependency Injection (CDI) to allow Vaadin UI and view classes to be managed beans that can reference EE objects through annotations like @Inject and @EJB. This allows Vaadin applications to easily access services, repositories, and other components defined using Java EE APIs and specifications.

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Vaadin 7 Java Enterprise Edition Integration Peter Lehto Vaadin Expert @peter_lehto
What is Vaadin? Java EE 7
Vaadin CDI Addon Structuring Vaadin App Application architecture
How to get star ted QA Authentication Authorization
User interface framework for rich web applications
User Interface Components
User Interface Components
Developer Productivity Rich UX
How does server-side UI work, really?
• Loader page • CSS Theme • Images • JavaScript
• Loader page • CSS Theme • Images • JavaScript 135k Compressed & reduced thin client
• name=”Joonas” • button clicked ! 261 bytes
• name=”Joonas” • button clicked ! 261 bytes • Add notification ! 267 bytes
Java Enterprise Edition 7
Collection of Java Specification Requests (JSRs) for writing (web) applications
Collection of Java Specification Requests (JSRs) for writing (web) applications Application server implements Java EE specification
Do you know some Java EE specs?
Java Persistence API 2.1 (JPA) (JSR-338)
Java Persistence API 2.1 (JPA) Enterprise Java Beans (JSR-338) 3.2 (EJB) (JSR-345)
Java Persistence API 2.1 (JPA) Enterprise Java Beans (JSR-338) 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340)
Java Persistence API 2.1 (JPA) Enterprise Java Beans (JSR-338) 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Java Message Service 2.0 (JMS) (JSR-343)
Java Persistence API 2.1 (JPA) Enterprise Java Beans (JSR-338) 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Java Message Service 2.0 (JMS) Context and Dependency Injection (JSR-343) 1.1 (CDI) (JSR-340)
Java Persistence API 2.1 (JPA) Enterprise Java Beans (JSR-338) 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Java Message Service 2.0 (JMS) Context and Dependency Injection (JSR-343) 1.1 (CDI) (JSR-340) Java Server Faces 2.2 (JSF) (JSR-344)
Java Persistence API 2.1 (JPA) Enterprise Java Beans (JSR-338) 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Java Message Service 2.0 (JMS) Context and Dependency Injection (JSR-343) 1.1 (CDI) (JSR-340) Java Server Faces Java Server Pages 2.2 (JSF) (JSR-344) 2.3 (JSF) (JSR-245)
Java Persistence API 2.1 (JPA) Enterprise Java Beans (JSR-338) 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Java Message Service 2.0 (JMS) Context and Dependency Injection (JSR-343) 1.1 (CDI) (JSR-340) Java Server Faces Java Server Pages 2.2 (JSF) (JSR-344) 2.3 (JSF) (JSR-245) Bean Validation 1.1 (JSR-349)
Java Persistence API 2.1 (JPA) Enterprise Java Beans (JSR-338) 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Java Message Service 2.0 (JMS) Context and Dependency Injection (JSR-343) 1.1 (CDI) (JSR-340) Java Server Faces Java Server Pages 2.2 (JSF) (JSR-344) 2.3 (JSF) (JSR-245) Bean Validation 1.1 Int(eJSrRc-e34p9)tors 1.2 (JSR-318)
Java Persistence API 2.1 (JPA) Enterprise Java Beans (JSR-338) 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Java Message Service 2.0 (JMS) Context and Dependency Injection (JSR-343) 1.1 (CDI) (JSR-340) Java Server Faces Java Server Pages 2.2 (JSF) (JSR-344) 2.3 (JSF) (JSR-245) Bean Validation 1.1 Int(eJSrRc-e34p9)tors 1.2 (JSR-318) Java Transaction API 1.2 (JTA) (JSR-907)
Java Persistence API 2.1 (JPA) Enterprise Java Beans (JSR-338) 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Java Message Service 2.0 (JMS) Context and Dependency Injection (JSR-343) 1.1 (CDI) (JSR-340) Java Server Faces Java Server Pages 2.2 (JSF) (JSR-344) 2.3 (JSF) (JSR-245) Bean Validation 1.1 Int(eJSrRc-e34p9)tors 1.2 (JSR-318) Java Transaction API 1.2 (JTA) (JSR-907) Java API for RESTful Web Services 2.0 (JAX-RS) (JSR-907)
Java Persistence API 2.1 (JPA) Enterprise Java Beans (JSR-338) 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Java Message Service 2.0 (JMS) Context and Dependency Injection (JSR-343) 1.1 (CDI) (JSR-340) Java Server Faces Java Server Pages 2.2 (JSF) (JSR-344) 2.3 (JSF) (JSR-245) Bean Validation 1.1 Int(eJSrRc-e34p9)tors 1.2 (JSR-318) Java Transaction API 1.2 (JTA) (JSR-907) Java API for RESTful Web Services 2.0 Java API for XML based Web Services 2.2 (JAX-RS) (JSR-907) (JAX-WS) (JSR-907)
Java Persistence API 2.1 (JPA) Enterprise Java Beans (JSR-338) 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Java Message Service 2.0 (JMS) Context and Dependency Injection (JSR-343) 1.1 (CDI) (JSR-340) Java Server Faces Java Server Pages 2.2 (JSF) (JSR-344) 2.3 (JSF) (JSR-245) Bean Validation 1.1 Int(eJSrRc-e34p9)tors 1.2 (JSR-318) Java Transaction API 1.2 (JTA) (JSR-907) Java API for RESTful Web Services 2.0 Java API for XML based Web Services 2.2 (JAX-RS) (JSR-907) Java Architecture for XML Binding 2.2 (JAX-WS) (JSR-907) (JAX-B) (JSR-222)
Which APIs should I know? APIs that are part of “Web Profile”
Java Servlet 3.1 (JSR-340)
Java Servlet 3.1 Ja(JvSaR- 3P40e) rsistence API 2.1 (JPA) (JSR-338)
Java Servlet 3.1 Ja(JvSaR- 3P40e) rsistence API 2.1 (JPA) E(JnStRe-3r3p8r) ise Java Beans 3.2 (EJB) (JSR-345)
Java Servlet 3.1 Ja(JvSaR- 3P40e) rsistence API 2.1 (JPA) E(JnStRe-3r3p8r) ise Java Beans 3.2 (EJB) Context and (JSR-Dependency 345) Injection 1.1 (CDI) (JSR-340)
Java Servlet 3.1 Ja(JvSaR- 3P40e) rsistence API 2.1 (JPA) E(JnStRe-3r3p8r) ise Java Beans 3.2 (EJB) Context and (JSR-Dependency 345) Injection 1.1 (CDI) Java Message Service (JSR-340) 2.0 (JMS) (JSR-343)
Java Servlet 3.1 Ja(JvSaR- 3P40e) rsistence API 2.1 (JPA) E(JnStRe-3r3p8r) ise Java Beans 3.2 (EJB) Context and (JSR-Dependency 345) Injection 1.1 (CDI) Java Message Service (JSR-340) 2.0 (JMS) Bea(JSnR -V34a3l)idation 1.1 (JSR-349)
Java Servlet 3.1 Ja(JvSaR- 3P40e) rsistence API 2.1 (JPA) E(JnStRe-3r3p8r) ise Java Beans 3.2 (EJB) Context and (JSR-Dependency 345) Injection 1.1 (CDI) Java Message Service (JSR-340) 2.0 (JMS) Bea(JSnR -V34a3l)idation 1.1 (JSR-349) Interceptors 1.2 (JSR-318)
Java Servlet 3.1 Ja(JvSaR- 3P40e) rsistence API 2.1 (JPA) E(JnStRe-3r3p8r) ise Java Beans 3.2 (EJB) Context and (JSR-Dependency 345) Injection 1.1 (CDI) Java Message Service (JSR-340) 2.0 (JMS) Bea(JSnR -V34a3l)idation 1.1 (JSR-349) Interceptors 1.2 Jav(JaS RA-3P1I8 )for RESTful Web Services 2.0 (JAX-RS) (JSR-907)
Java Persistence API 2.1 (JPA)
@Entity ______________________________ Customer @Id @AutoGenerated Long id; ! @Column(nullable = false) ! String name; ! Date birthdate;
@Entity ______________________________ Customer ! 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;
@Entity ______________________________ Customer @Id @AutoGenerated Long id; ! @Column(nullable = false) ! String name; ! Date birthdate; ! @OneToMany(mappedBy=“customer”) List<Invoice> invoices; Customer Id name birthdate 1 Alex 07.02.1984 2 John 18.2.1992 Invoice Id customer number 1 1 123 2 1 124
Enterprise Java Beans 3.2 (EJB)
Enterprise Java Beans For defining business layer with service methods
Enterprise Java Beans For defining business layer with service methods For local and remote services
Enterprise Java Beans For defining business layer with service methods For local and remote services For transaction boundaries
(UI) CustomerView !
(@Remote) CustomerService (UI) CustomerView ! @Remote @Local
(@Remote) CustomerService (UI) CustomerView ! (@Stateless) (@Stateless) CustomerService CustomerService Bean @Remote @Local @Stateless @Stateful @Singleton (@Stateless) CustomerService Bean Bean
(DB) Customer Database
! @Local! public interface CustomerService {! ! ! void storeCustomers(Collection<Customer> customers);! ! ! void removeCustomers(Collection<Customer> customers);! ! ! Collection<Customer> getAllCustomers()! ! ! Optional<Customer> getCustomerByName(String name);! }
! @Stateless! public class UserServiceBean implements ! ! UserService {! ! ! @PersistenceContext! ! private EntityManager em;! ! ! ! public void storeUsers(Collection<User> users) {! ! ! users.forEach(user -> storeUser(user));! ! }! ! ! public void storeUser(User user) {! ! ! em.merge(user);! ! }! }
Context and Dependency Injection 1.1 (CDI)
Context and Dependency Injection Instead of saying new say @Inject
Context and Dependency Injection Instead of saying new say @Inject Decouples code and lets container manage dependencies
Context and Dependency Injection Injections occur within a scope
Context and Dependency Injection Injections occur within a scope @ApplicationScoped @SessionScoped @RequestScoped
Context and Dependency Injection Injections occur within a scope @ApplicationScoped @SessionScoped @RequestScoped @UIScoped @ViewScoped
@Stateless CustomerService _________________ ! @EJB InvoiceService invoices; @UIScoped AppUI _________________ ! @EJB CustomerService service; ! @Inject MainMenu mainMenu; ! @Inject User currentUser; @UIScoped MainMenu _________________ ! @Stateless InvoiceService @Inject Event<MenuEvent> menuEventSource;
Integration to EE through Vaadin CDI
UI and View as managed bean with @CDIUI and @CDIView
UI and View as managed bean with @CDIUI and @CDIView Allows annotations like @Inject and @EJB to be processed inside Vaadin beans.
UI and View as managed bean with @CDIUI and @CDIView Allows annotations like @Inject and @EJB to be processed inside Vaadin beans. Easily reference EE objects
@CDIUI(“”)! public class AppUI extends UI {! ! }
@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);! ! }! }
@UIScoped AppUI _____________________________ ! @Inject private MainMenu menu; ! @Inject private ViewManager viewMgr; ! @Inject private User loggedInUser; <<UIScope>> ! MainMenu ViewManager ! <<SessionScope>> ! User
<<UIScope>> <<UIScope>> <<UIScope>> ! MenuBar Footer ViewManager ! <<SessionScope>> ! User @UIScoped AppUI _____________________________ ! @Inject private MenuBar menu; ! ! @Inject private ViewManager viewMgr; ! @Inject private User loggedInUser; <<UIScope>> ! MenuBar Footer ViewManager ! ! MenuBar Footer ViewManager ! ! MenuBar ViewManager !
VaadinServlet
VaadinServlet HttpSession 1 n
VaadinServlet 1 n 1 HttpSession VaadinSession 1 1 n
VaadinServlet 1 HttpSession VaadinSession UI 1 n 1 1 n 1 *
@UIScoped
@UIScoped Necessary to acquire UI specific instances
@UIScoped Necessary to acquire UI specific instances CDI context to map beans per UI instance
@UIScoped Necessary to acquire UI specific instances CDI context to map beans per UI instance @UIScoped
@UIScoped! public class MainMenu extends CustomComponent {! ! }
@UIScoped! public class MainMenu extends CustomComponent {! ! ! @Inject! ! private Event<NavigationEvent> eventSource;! ! ! ! protected void onMenuItemClicked(MenuItem item) {! ! ! eventSource.fireEvent(new NavigationEvent(item));! ! }! }
@CDIUI(“”)! public class AppUI extends UI {! ! ! ! …! ! ! protected void onNavigationEvent(@Observes! ! ! ! ! ! ! ! ! ! ! ! ! ! ! NavigationEvent event) {! ! viewMgr.navigateTo(event.getView());! ! }! }
Structuring Vaadin App with Model View Presenter
Do you like spaghetti?
Do you like spaghetti? Let’s clean it!
History behind MVP
Late 1970s
Late 1970s Originally Model-View-Controller
Late 1970s Originally Model-View-Controller SmallTalk-80
Late 1970s Originally Model-View-Controller SmallTalk-80 Controller is mediator between end user and application
Late 1970s Originally Model-View-Controller SmallTalk-80 Controller is mediator between end user and application Model notifies about changes with Observer pattern
1980s
1980s Taligent Model-View-Presenter
1980s Taligent Model-View-Presenter Influenced by SmallTalk-80
1980s Taligent Model-View-Presenter Influenced by SmallTalk-80 Model, View, Presenter, Interactors, Commands, Selections
1980s Taligent Model-View-Presenter Influenced by SmallTalk-80 Model, View, Presenter, Interactors, Commands, Selections Presenter orchestrates the structure, not the input
late 1980s
late 1980s Simplified Taligent MVP
late 1980s Simplified Taligent MVP Views handle input events initially
late 1980s Simplified Taligent MVP Views handle input events initially Model may fire events
late 1980s Simplified Taligent MVP Views handle input events initially Model may fire events Presenter handles the logic, not the user input control
late 1980s Simplified Taligent MVP Views handle input events initially Model may fire events Presenter handles the logic, not the user input control
UI layer MVP targets Clean code best practices like…
Single responsibility principle Class should change only for one reason
Open closed principle Open for extension, closed for change
Today many MVP variations exists Here’s one…
Model-View-Presenter Presenter View Model
Model-View-Presenter Presenter View Model
Model-View-Presenter View Impl Presenter View Model
Example EditorView - Button saveButton;! - Button cancelButton;! - FieldGroup personFieldGroup; - saveButtonClicked()! - cancelButtonClicked() ClickListener + buttonClicked()
Presenter + saveButtonClicked()! + cancelButtonClicked()! Example EditorView - Button saveButton;! - Button cancelButton;! - FieldGroup personFieldGroup; + commitChanges()! + discardChanges() ClickListener + buttonClicked()
Presenter + saveButtonClicked()! + cancelButtonClicked()! + commitChanges()! + discardChanges() Example EditorViewImpl - Button saveButton;! - Button cancelButton;! - FieldGroup personFieldGroup; + commitChanges()! + discardChanges() ClickListener + buttonClicked() EditorView
Benefits of MVP
Benefits of MVP Separation of concerns simplifying code
Benefits of MVP Separation of concerns simplifying code UI logic becomes separated from rendering providing testability
Benefits of MVP Separation of concerns simplifying code UI logic becomes separated from rendering providing testability Keeps spaghetti in a cup by following clean code principles
Application Architecture
Client Browser View Business Persistency <<EJB>> Business Logic Server-side-UI Presenter <<JPA>> Persistency
Server-side-UI Client Browser View
public interface CustomerView extends ApplicationView<CustomerViewPresenter> { ! }
public interface CustomerView extends ApplicationView<CustomerViewPresenter> { ! void populateCustomers(Collection<Customer> customers); ! void openEditorFor(Customer customer); void closeEditor(); void removeTableSelection(); }
Server-side-UI Client Browser View Presenter
@ViewScoped public class CustomerViewPresenter extends AbstractPresenter<CustomerView> { ! }
@ViewScoped public class CustomerViewPresenter extends AbstractPresenter<CustomerView> { ! @EJB private CustomerService customerService; ! @Override protected void onViewEnter() { getView().populateCustomers(customerService.getAllCustomers()); } }
@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) { … } }
Client Browser View <<EJB>> Business Logic Server-side-UI Presenter Business
@Local public interface CustomerService { ! void storeCustomers(Collection<Customer> customers); ! void removeCustomers(Collection<Customer> customers); ! Collection<Customer> getAllCustomers(); ! Optional<Customer> getCustomerByUsername(String username); }
@Stateless @TransactionAttribute(Application TransactionAttributeType.REQUIRED) public Architecture 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(); } ! … }
Client Browser View Business Persistency <<EJB>> Business Logic Server-side-UI Presenter <<JPA>> Persistency
@Entity public Application Architecture class Customer { ! @Id @AutoGenerated private Long id; ! private String name; ! @Temporal(DATE) private Date birthDate; ! public boolean isPersisted() { return id != null; } ! … }
<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>
Authentication and Authorization
com.vaadin.cdi.access.AccessControl
com.vaadin.cdi.access.AccessControl @RolesAllowed
com.vaadin.cdi.access.AccessControl @RolesAllowed isUserSignedIn(), isUserInRole(String), getPrincipalName() isUserHavingAccessToView(ViewBean)
com.vaadin.cdi.access.AccessControl @RolesAllowed isUserSignedIn(), isUserInRole(String), getPrincipalName() isUserHavingAccessToView(ViewBean) Can be replaced with @Alternative
How to Get Started?
<dependency <groupId>com.vaadin</groupId> <artifactId>vaadin-cdi</artifactId> <version>1.0.0.beta4</version> </dependency> ! <repository> <id>vaadin-addons</id> <url>http://maven.vaadin.com/vaadin-addons</url> </repository>
Eclipse Download plugin from Martketplace
IntelliJ IDEA Built-in support
Netbeans Download plugin Netbeans Plugin Portal
Example App github.com/peterl1084/cdiexample
Lessons learned today
Lessons learned today 1. Java EE contains tons of specifications for enterprise apps
Lessons learned today 1. Java EE contains tons of specifications for enterprise apps 2. Vaadin is a great way to assemble web apps with components
Lessons learned today 1. Java EE contains tons of specifications for enterprise apps 2. Vaadin is a great way to assemble web apps with components 3. Combining Vaadin with Java EE works best through CDI
Lessons learned today 1. Java EE contains tons of specifications for enterprise apps 2. Vaadin is a great way to assemble web apps with components 3. Combining Vaadin with Java EE works best through CDI 4. Following best practices makes your code maintainable
Lessons learned today 1. Java EE contains tons of specifications for enterprise apps 2. Vaadin is a great way to assemble web apps with components 3. Combining Vaadin with Java EE works best through CDI 4. Following best practices makes your code maintainable 5. Vaadin is a Finnish word meaning Reindeer
Download for Free vaadin.com/book PDF, ePub, HTML ISBN 978-952-93-1970-1 9789529319701 ISBN 978-952-93-1970-1 9789529319701 Vol 1 288 pages Vol 2 434 pages
Questions or Comments? Peter Lehto Vaadin Expert @peter_lehto

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Vaadin 7 - Java Enterprise Edition integration

  • 1.
    Vaadin 7 JavaEnterprise Edition Integration Peter Lehto Vaadin Expert @peter_lehto
  • 2.
    What is Vaadin? Java EE 7
  • 3.
    Vaadin CDI Addon Structuring Vaadin App Application architecture
  • 4.
    How to getstar ted QA Authentication Authorization
  • 7.
    User interface frameworkfor rich web applications
  • 8.
  • 9.
  • 10.
  • 11.
    How does server-side UI work, really?
  • 13.
    • Loader page • CSS Theme • Images • JavaScript
  • 14.
    • Loader page • CSS Theme • Images • JavaScript 135k Compressed & reduced thin client
  • 17.
    • name=”Joonas” •button clicked ! 261 bytes
  • 19.
    • name=”Joonas” •button clicked ! 261 bytes • Add notification ! 267 bytes
  • 20.
  • 21.
    Collection of JavaSpecification Requests (JSRs) for writing (web) applications
  • 22.
    Collection of JavaSpecification Requests (JSRs) for writing (web) applications Application server implements Java EE specification
  • 25.
    Do you knowsome Java EE specs?
  • 26.
    Java Persistence API2.1 (JPA) (JSR-338)
  • 27.
    Java Persistence API2.1 (JPA) Enterprise Java Beans (JSR-338) 3.2 (EJB) (JSR-345)
  • 28.
    Java Persistence API2.1 (JPA) Enterprise Java Beans (JSR-338) 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340)
  • 29.
    Java Persistence API2.1 (JPA) Enterprise Java Beans (JSR-338) 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Java Message Service 2.0 (JMS) (JSR-343)
  • 30.
    Java Persistence API2.1 (JPA) Enterprise Java Beans (JSR-338) 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Java Message Service 2.0 (JMS) Context and Dependency Injection (JSR-343) 1.1 (CDI) (JSR-340)
  • 31.
    Java Persistence API2.1 (JPA) Enterprise Java Beans (JSR-338) 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Java Message Service 2.0 (JMS) Context and Dependency Injection (JSR-343) 1.1 (CDI) (JSR-340) Java Server Faces 2.2 (JSF) (JSR-344)
  • 32.
    Java Persistence API2.1 (JPA) Enterprise Java Beans (JSR-338) 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Java Message Service 2.0 (JMS) Context and Dependency Injection (JSR-343) 1.1 (CDI) (JSR-340) Java Server Faces Java Server Pages 2.2 (JSF) (JSR-344) 2.3 (JSF) (JSR-245)
  • 33.
    Java Persistence API2.1 (JPA) Enterprise Java Beans (JSR-338) 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Java Message Service 2.0 (JMS) Context and Dependency Injection (JSR-343) 1.1 (CDI) (JSR-340) Java Server Faces Java Server Pages 2.2 (JSF) (JSR-344) 2.3 (JSF) (JSR-245) Bean Validation 1.1 (JSR-349)
  • 34.
    Java Persistence API2.1 (JPA) Enterprise Java Beans (JSR-338) 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Java Message Service 2.0 (JMS) Context and Dependency Injection (JSR-343) 1.1 (CDI) (JSR-340) Java Server Faces Java Server Pages 2.2 (JSF) (JSR-344) 2.3 (JSF) (JSR-245) Bean Validation 1.1 Int(eJSrRc-e34p9)tors 1.2 (JSR-318)
  • 35.
    Java Persistence API2.1 (JPA) Enterprise Java Beans (JSR-338) 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Java Message Service 2.0 (JMS) Context and Dependency Injection (JSR-343) 1.1 (CDI) (JSR-340) Java Server Faces Java Server Pages 2.2 (JSF) (JSR-344) 2.3 (JSF) (JSR-245) Bean Validation 1.1 Int(eJSrRc-e34p9)tors 1.2 (JSR-318) Java Transaction API 1.2 (JTA) (JSR-907)
  • 36.
    Java Persistence API2.1 (JPA) Enterprise Java Beans (JSR-338) 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Java Message Service 2.0 (JMS) Context and Dependency Injection (JSR-343) 1.1 (CDI) (JSR-340) Java Server Faces Java Server Pages 2.2 (JSF) (JSR-344) 2.3 (JSF) (JSR-245) Bean Validation 1.1 Int(eJSrRc-e34p9)tors 1.2 (JSR-318) Java Transaction API 1.2 (JTA) (JSR-907) Java API for RESTful Web Services 2.0 (JAX-RS) (JSR-907)
  • 37.
    Java Persistence API2.1 (JPA) Enterprise Java Beans (JSR-338) 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Java Message Service 2.0 (JMS) Context and Dependency Injection (JSR-343) 1.1 (CDI) (JSR-340) Java Server Faces Java Server Pages 2.2 (JSF) (JSR-344) 2.3 (JSF) (JSR-245) Bean Validation 1.1 Int(eJSrRc-e34p9)tors 1.2 (JSR-318) Java Transaction API 1.2 (JTA) (JSR-907) Java API for RESTful Web Services 2.0 Java API for XML based Web Services 2.2 (JAX-RS) (JSR-907) (JAX-WS) (JSR-907)
  • 38.
    Java Persistence API2.1 (JPA) Enterprise Java Beans (JSR-338) 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Java Message Service 2.0 (JMS) Context and Dependency Injection (JSR-343) 1.1 (CDI) (JSR-340) Java Server Faces Java Server Pages 2.2 (JSF) (JSR-344) 2.3 (JSF) (JSR-245) Bean Validation 1.1 Int(eJSrRc-e34p9)tors 1.2 (JSR-318) Java Transaction API 1.2 (JTA) (JSR-907) Java API for RESTful Web Services 2.0 Java API for XML based Web Services 2.2 (JAX-RS) (JSR-907) Java Architecture for XML Binding 2.2 (JAX-WS) (JSR-907) (JAX-B) (JSR-222)
  • 39.
    Which APIs shouldI know? APIs that are part of “Web Profile”
  • 40.
    Java Servlet 3.1 (JSR-340)
  • 41.
    Java Servlet 3.1 Ja(JvSaR- 3P40e) rsistence API 2.1 (JPA) (JSR-338)
  • 42.
    Java Servlet 3.1 Ja(JvSaR- 3P40e) rsistence API 2.1 (JPA) E(JnStRe-3r3p8r) ise Java Beans 3.2 (EJB) (JSR-345)
  • 43.
    Java Servlet 3.1 Ja(JvSaR- 3P40e) rsistence API 2.1 (JPA) E(JnStRe-3r3p8r) ise Java Beans 3.2 (EJB) Context and (JSR-Dependency 345) Injection 1.1 (CDI) (JSR-340)
  • 44.
    Java Servlet 3.1 Ja(JvSaR- 3P40e) rsistence API 2.1 (JPA) E(JnStRe-3r3p8r) ise Java Beans 3.2 (EJB) Context and (JSR-Dependency 345) Injection 1.1 (CDI) Java Message Service (JSR-340) 2.0 (JMS) (JSR-343)
  • 45.
    Java Servlet 3.1 Ja(JvSaR- 3P40e) rsistence API 2.1 (JPA) E(JnStRe-3r3p8r) ise Java Beans 3.2 (EJB) Context and (JSR-Dependency 345) Injection 1.1 (CDI) Java Message Service (JSR-340) 2.0 (JMS) Bea(JSnR -V34a3l)idation 1.1 (JSR-349)
  • 46.
    Java Servlet 3.1 Ja(JvSaR- 3P40e) rsistence API 2.1 (JPA) E(JnStRe-3r3p8r) ise Java Beans 3.2 (EJB) Context and (JSR-Dependency 345) Injection 1.1 (CDI) Java Message Service (JSR-340) 2.0 (JMS) Bea(JSnR -V34a3l)idation 1.1 (JSR-349) Interceptors 1.2 (JSR-318)
  • 47.
    Java Servlet 3.1 Ja(JvSaR- 3P40e) rsistence API 2.1 (JPA) E(JnStRe-3r3p8r) ise Java Beans 3.2 (EJB) Context and (JSR-Dependency 345) Injection 1.1 (CDI) Java Message Service (JSR-340) 2.0 (JMS) Bea(JSnR -V34a3l)idation 1.1 (JSR-349) Interceptors 1.2 Jav(JaS RA-3P1I8 )for RESTful Web Services 2.0 (JAX-RS) (JSR-907)
  • 48.
  • 49.
    @Entity ______________________________ Customer @Id @AutoGenerated Long id; ! @Column(nullable = false) ! String name; ! Date birthdate;
  • 50.
    @Entity ______________________________ Customer ! 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;
  • 51.
    @Entity ______________________________ Customer @Id @AutoGenerated Long id; ! @Column(nullable = false) ! String name; ! Date birthdate; ! @OneToMany(mappedBy=“customer”) List<Invoice> invoices; Customer Id name birthdate 1 Alex 07.02.1984 2 John 18.2.1992 Invoice Id customer number 1 1 123 2 1 124
  • 52.
  • 53.
    Enterprise Java Beans For defining business layer with service methods
  • 54.
    Enterprise Java Beans For defining business layer with service methods For local and remote services
  • 55.
    Enterprise Java Beans For defining business layer with service methods For local and remote services For transaction boundaries
  • 56.
  • 57.
    (@Remote) CustomerService (UI) CustomerView ! @Remote @Local
  • 58.
    (@Remote) CustomerService (UI) CustomerView ! (@Stateless) (@Stateless) CustomerService CustomerService Bean @Remote @Local @Stateless @Stateful @Singleton (@Stateless) CustomerService Bean Bean
  • 59.
  • 60.
    ! @Local! publicinterface CustomerService {! ! ! void storeCustomers(Collection<Customer> customers);! ! ! void removeCustomers(Collection<Customer> customers);! ! ! Collection<Customer> getAllCustomers()! ! ! Optional<Customer> getCustomerByName(String name);! }
  • 61.
    ! @Stateless! publicclass UserServiceBean implements ! ! UserService {! ! ! @PersistenceContext! ! private EntityManager em;! ! ! ! public void storeUsers(Collection<User> users) {! ! ! users.forEach(user -> storeUser(user));! ! }! ! ! public void storeUser(User user) {! ! ! em.merge(user);! ! }! }
  • 62.
    Context and Dependency Injection 1.1 (CDI)
  • 63.
    Context and Dependency Injection Instead of saying new say @Inject
  • 64.
    Context and Dependency Injection Instead of saying new say @Inject Decouples code and lets container manage dependencies
  • 65.
    Context and Dependency Injection Injections occur within a scope
  • 66.
    Context and Dependency Injection Injections occur within a scope @ApplicationScoped @SessionScoped @RequestScoped
  • 67.
    Context and Dependency Injection Injections occur within a scope @ApplicationScoped @SessionScoped @RequestScoped @UIScoped @ViewScoped
  • 68.
    @Stateless CustomerService _________________ ! @EJB InvoiceService invoices; @UIScoped AppUI _________________ ! @EJB CustomerService service; ! @Inject MainMenu mainMenu; ! @Inject User currentUser; @UIScoped MainMenu _________________ ! @Stateless InvoiceService @Inject Event<MenuEvent> menuEventSource;
  • 69.
    Integration to EEthrough Vaadin CDI
  • 70.
    UI and Viewas managed bean with @CDIUI and @CDIView
  • 71.
    UI and Viewas managed bean with @CDIUI and @CDIView Allows annotations like @Inject and @EJB to be processed inside Vaadin beans.
  • 72.
    UI and Viewas managed bean with @CDIUI and @CDIView Allows annotations like @Inject and @EJB to be processed inside Vaadin beans. Easily reference EE objects
  • 73.
    @CDIUI(“”)! public classAppUI extends UI {! ! }
  • 74.
    @CDIUI(“”)! public classAppUI 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);! ! }! }
  • 75.
    @UIScoped AppUI _____________________________ ! @Inject private MainMenu menu; ! @Inject private ViewManager viewMgr; ! @Inject private User loggedInUser; <<UIScope>> ! MainMenu ViewManager ! <<SessionScope>> ! User
  • 76.
    <<UIScope>> <<UIScope>> <<UIScope>> ! MenuBar Footer ViewManager ! <<SessionScope>> ! User @UIScoped AppUI _____________________________ ! @Inject private MenuBar menu; ! ! @Inject private ViewManager viewMgr; ! @Inject private User loggedInUser; <<UIScope>> ! MenuBar Footer ViewManager ! ! MenuBar Footer ViewManager ! ! MenuBar ViewManager !
  • 77.
  • 78.
  • 79.
    VaadinServlet 1 n 1 HttpSession VaadinSession 1 1 n
  • 80.
    VaadinServlet 1 HttpSessionVaadinSession UI 1 n 1 1 n 1 *
  • 81.
  • 82.
    @UIScoped Necessary toacquire UI specific instances
  • 83.
    @UIScoped Necessary toacquire UI specific instances CDI context to map beans per UI instance
  • 84.
    @UIScoped Necessary toacquire UI specific instances CDI context to map beans per UI instance @UIScoped
  • 85.
    @UIScoped! public classMainMenu extends CustomComponent {! ! }
  • 86.
    @UIScoped! public classMainMenu extends CustomComponent {! ! ! @Inject! ! private Event<NavigationEvent> eventSource;! ! ! ! protected void onMenuItemClicked(MenuItem item) {! ! ! eventSource.fireEvent(new NavigationEvent(item));! ! }! }
  • 87.
    @CDIUI(“”)! public classAppUI extends UI {! ! ! ! …! ! ! protected void onNavigationEvent(@Observes! ! ! ! ! ! ! ! ! ! ! ! ! ! ! NavigationEvent event) {! ! viewMgr.navigateTo(event.getView());! ! }! }
  • 88.
    Structuring Vaadin Appwith Model View Presenter
  • 89.
    Do you like spaghetti?
  • 90.
    Do you like spaghetti? Let’s clean it!
  • 91.
  • 92.
  • 93.
    Late 1970s OriginallyModel-View-Controller
  • 94.
    Late 1970s OriginallyModel-View-Controller SmallTalk-80
  • 95.
    Late 1970s OriginallyModel-View-Controller SmallTalk-80 Controller is mediator between end user and application
  • 96.
    Late 1970s OriginallyModel-View-Controller SmallTalk-80 Controller is mediator between end user and application Model notifies about changes with Observer pattern
  • 97.
  • 98.
  • 99.
    1980s Taligent Model-View-Presenter Influenced by SmallTalk-80
  • 100.
    1980s Taligent Model-View-Presenter Influenced by SmallTalk-80 Model, View, Presenter, Interactors, Commands, Selections
  • 101.
    1980s Taligent Model-View-Presenter Influenced by SmallTalk-80 Model, View, Presenter, Interactors, Commands, Selections Presenter orchestrates the structure, not the input
  • 102.
  • 103.
  • 104.
    late 1980s SimplifiedTaligent MVP Views handle input events initially
  • 105.
    late 1980s SimplifiedTaligent MVP Views handle input events initially Model may fire events
  • 106.
    late 1980s SimplifiedTaligent MVP Views handle input events initially Model may fire events Presenter handles the logic, not the user input control
  • 107.
    late 1980s SimplifiedTaligent MVP Views handle input events initially Model may fire events Presenter handles the logic, not the user input control
  • 108.
    UI layer MVPtargets Clean code best practices like…
  • 109.
    Single responsibility principle Class should change only for one reason
  • 110.
    Open closed principle Open for extension, closed for change
  • 111.
    Today many MVPvariations exists Here’s one…
  • 112.
  • 113.
  • 114.
    Model-View-Presenter View Impl Presenter View Model
  • 115.
    Example EditorView -Button saveButton;! - Button cancelButton;! - FieldGroup personFieldGroup; - saveButtonClicked()! - cancelButtonClicked() ClickListener + buttonClicked()
  • 116.
    Presenter + saveButtonClicked()! + cancelButtonClicked()! Example EditorView - Button saveButton;! - Button cancelButton;! - FieldGroup personFieldGroup; + commitChanges()! + discardChanges() ClickListener + buttonClicked()
  • 117.
    Presenter + saveButtonClicked()! + cancelButtonClicked()! + commitChanges()! + discardChanges() Example EditorViewImpl - Button saveButton;! - Button cancelButton;! - FieldGroup personFieldGroup; + commitChanges()! + discardChanges() ClickListener + buttonClicked() EditorView
  • 118.
  • 119.
    Benefits of MVP Separation of concerns simplifying code
  • 120.
    Benefits of MVP Separation of concerns simplifying code UI logic becomes separated from rendering providing testability
  • 121.
    Benefits of MVP Separation of concerns simplifying code UI logic becomes separated from rendering providing testability Keeps spaghetti in a cup by following clean code principles
  • 122.
  • 123.
    Client Browser View Business Persistency <<EJB>> Business Logic Server-side-UI Presenter <<JPA>> Persistency
  • 124.
  • 125.
    public interface CustomerViewextends ApplicationView<CustomerViewPresenter> { ! }
  • 126.
    public interface CustomerViewextends ApplicationView<CustomerViewPresenter> { ! void populateCustomers(Collection<Customer> customers); ! void openEditorFor(Customer customer); void closeEditor(); void removeTableSelection(); }
  • 127.
  • 128.
    @ViewScoped public classCustomerViewPresenter extends AbstractPresenter<CustomerView> { ! }
  • 129.
    @ViewScoped public classCustomerViewPresenter extends AbstractPresenter<CustomerView> { ! @EJB private CustomerService customerService; ! @Override protected void onViewEnter() { getView().populateCustomers(customerService.getAllCustomers()); } }
  • 130.
    @ViewScoped public classCustomerViewPresenter 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) { … } }
  • 131.
    Client Browser View <<EJB>> Business Logic Server-side-UI Presenter Business
  • 132.
    @Local public interfaceCustomerService { ! void storeCustomers(Collection<Customer> customers); ! void removeCustomers(Collection<Customer> customers); ! Collection<Customer> getAllCustomers(); ! Optional<Customer> getCustomerByUsername(String username); }
  • 133.
    @Stateless @TransactionAttribute(Application TransactionAttributeType.REQUIRED) public Architecture 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(); } ! … }
  • 134.
    Client Browser View Business Persistency <<EJB>> Business Logic Server-side-UI Presenter <<JPA>> Persistency
  • 135.
    @Entity public Application Architecture class Customer { ! @Id @AutoGenerated private Long id; ! private String name; ! @Temporal(DATE) private Date birthDate; ! public boolean isPersisted() { return id != null; } ! … }
  • 136.
    <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>
  • 137.
  • 138.
  • 139.
  • 140.
    com.vaadin.cdi.access.AccessControl @RolesAllowed isUserSignedIn(), isUserInRole(String), getPrincipalName() isUserHavingAccessToView(ViewBean)
  • 141.
    com.vaadin.cdi.access.AccessControl @RolesAllowed isUserSignedIn(), isUserInRole(String), getPrincipalName() isUserHavingAccessToView(ViewBean) Can be replaced with @Alternative
  • 142.
    How to GetStarted?
  • 143.
    <dependency <groupId>com.vaadin</groupId> <artifactId>vaadin-cdi</artifactId> <version>1.0.0.beta4</version> </dependency> ! <repository> <id>vaadin-addons</id> <url>http://maven.vaadin.com/vaadin-addons</url> </repository>
  • 144.
    Eclipse Download plugin from Martketplace
  • 145.
  • 146.
    Netbeans Download plugin Netbeans Plugin Portal
  • 147.
  • 148.
  • 149.
    Lessons learned today 1. Java EE contains tons of specifications for enterprise apps
  • 150.
    Lessons learned today 1. Java EE contains tons of specifications for enterprise apps 2. Vaadin is a great way to assemble web apps with components
  • 151.
    Lessons learned today 1. Java EE contains tons of specifications for enterprise apps 2. Vaadin is a great way to assemble web apps with components 3. Combining Vaadin with Java EE works best through CDI
  • 152.
    Lessons learned today 1. Java EE contains tons of specifications for enterprise apps 2. Vaadin is a great way to assemble web apps with components 3. Combining Vaadin with Java EE works best through CDI 4. Following best practices makes your code maintainable
  • 153.
    Lessons learned today 1. Java EE contains tons of specifications for enterprise apps 2. Vaadin is a great way to assemble web apps with components 3. Combining Vaadin with Java EE works best through CDI 4. Following best practices makes your code maintainable 5. Vaadin is a Finnish word meaning Reindeer
  • 154.
    Download for Free vaadin.com/book PDF, ePub, HTML ISBN 978-952-93-1970-1 9789529319701 ISBN 978-952-93-1970-1 9789529319701 Vol 1 288 pages Vol 2 434 pages
  • 155.
    Questions or Comments? Peter Lehto Vaadin Expert @peter_lehto