ApiVerticle.java

public class ApiVerticle extends AbstractVerticle {

    private static final Logger LOGGER = LoggerFactory.getLogger(ApiVerticle.class);

    @Override
    public void start(Promise<Void> promise) {
        final PgPool dbClient = DbUtils.buildDbClient(vertx);

        final BookRepository bookRepository = new BookRepository();
        final BookService bookService = new BookService(dbClient, bookRepository);
        final BookHandler bookHandler = new BookHandler(bookService);
        final BookValidationHandler bookValidationHandler = new BookValidationHandler(vertx);
        final BookRouter bookRouter = new BookRouter(vertx, bookHandler, bookValidationHandler);

        final Router router = Router.router(vertx);
        ErrorHandler.buildHandler(router);
        HealthCheckRouter.setRouter(vertx, router, dbClient);
        MetricsRouter.setRouter(router);
        bookRouter.setRouter(router);

        buildHttpServer(vertx, promise, router);
    }

    /**
     * Run HTTP server on port 8888 with specified routes
     *
     * @param vertx   Vertx context
     * @param promise Callback
     * @param router  Router
     */
    private void buildHttpServer(Vertx vertx,
                                 Promise<Void> promise,
                                 Router router) {
        final int port = 8888;

        vertx.createHttpServer()
                .requestHandler(router)
                .listen(port, http -> {
                    if (http.succeeded()) {
                        promise.complete();
                        LOGGER.info(LogUtils.RUN_HTTP_SERVER_SUCCESS_MESSAGE.buildMessage(port));
                    } else {
                        promise.fail(http.cause());
                        LOGGER.info(LogUtils.RUN_HTTP_SERVER_ERROR_MESSAGE.buildMessage());
                    }
                });
    }

}