Data-Centric Applications with Vaadin 8

Implementing new modules

New modules have to implement the AppModule interface and follow the SPI requirements for packaging by adding a new file with the name packt.vaadin.datacentric.chapter02.api.AppModule into the META-INF/services directory. This file must contain the name of the fully qualified name of the AppModule implementation.

Let's say you want to develop a module that adds an option to the main menu that shows a notification when clicked. This can be easily implemented as follows:

package com.example;...public class ExampleModule implements AppModule {    @Override    public void register(ApplicationLayout layout) {        ApplicationLayout.MenuOption menuOption            = new ApplicationLayout.MenuOption("Example module");        layout.addMenuOption(menuOption, ...