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CDI MVP

Lightweight MVP pattern for Vaadin CDI projects

MVP (model-view-presenter) is an emphasized pattern for larger Vaadin applications. CDI MVP provides a lightweight approach to building a foundation for your front-end layer with Vaadin and MVP.

A good example on how to use CDI MVP in a Vaadin project can be found in the links section.

The add-on can only be used in Vaadin CDI enabled projects.

Sample code

@ViewInterface(ListView.class)
public class ListPresenter extends AbstractMVPPresenter<ListView> {
    @Inject
    private PersonDAOBean personDAO;

    public static final String EDIT_PERSON = "list_presenter_edit_person";
    public static final String SAVE_PERSON = "list_presenter_save_person";


    protected void editPerson(
            @Observes @CDIEvent(EDIT_PERSON) final ParameterDTO parameters) {
        view.editSelectedPerson();
    }

    protected void savePerson(
            @Observes @CDIEvent(SAVE_PERSON) final ParameterDTO parameters) {
        Person person = parameters.getPrimaryParameter(Person.class);
        if (person.isPersistent()) {
            personDAO.update(person);
        } else {
            person = personDAO.persist(person);
            view.addContactToList(person);
        }
        view.selectPerson(person);
    }
}

...
        editButton.addClickListener(new Button.ClickListener() {
            @Override
            public void buttonClick(final ClickEvent event) {
                /*
                 * Clicking the edit button only fires an event and nothing
                 * more. The presenter which observes the event will decide what
                 * happens next.
                 */
                fireViewEvent(ListPresenter.EDIT_PERSON, null);
            }
        });
...

Links

• Discussion Forum
• Source Code
• Issue Tracker
• Example Project

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