hakdogan / Vert.x

A tutorial about Vert.x Mongo client

Vert.x

This repository shows how to use the Vert.x core, web and test modules also mongodb and web client on a web application which contains RESTful Web Services.

What you will learn in this repository?

• How to deploy a Verticle
• How to create and use an HTTP server
• How to create a router for a web service
• How to use mongo client and handle CRUD operations
• How to page render with FreeMarkerTemplateEngine
• How to use vertx-unit for tests

Deploy a Verticle

Vertx vertx = Vertx.vertx();
vertx.deployVerticle(new VerticleRestServer());

Creating a Server and adding a Router to it

private Future<Void> createServer(){

        final Future<Void> future = Future.future();
        final Router router = Router.router(vertx);
        
        router.route("/*").handler(BodyHandler.create());
        router.get("/").handler(this::welcomePage);
        router.get("/api/articles").handler(this::getArticles);
        router.get("/api/articles/save").handler(this::getSavePage);
        router.post("/api/articles/save").handler(this::saveDocument);
        router.post("/api/articles/remove").handler(this::removeDocument);
        router.get("/api/collection/drop/:name").handler(this::dropCollection);
        
        vertx.createHttpServer().requestHandler(router::accept)
            .listen(config().getInteger("http.server.port", HTTP_PORT), result -> {
                if (result.succeeded()) {
                    log.info("HTTP server running on port " + HTTP_PORT);
                    future.complete();
                } else {
                    log.error("Could not start a HTTP server", result.cause());
                    future.fail(result.cause());
                }
            });
        
        return future;
    }

Creating a Mongo Client

final JsonObject mongoConfig = new JsonObject()
    .put("connection_string", DB_URI)
    .put("db_name", DB_NAME);
mongoClient = MongoClient.createShared(vertx, mongoConfig);

Page rendering

templateEngine.render(routingContext, TEMPLATES_DIRECTORY, url, page -> {
    if (page.succeeded()) {
        routingContext.response().putHeader(CONTENT_TYPE, produceType)
        .setStatusCode(statusCode)
        .end(page.result());
    } else {
        routingContext.fail(page.cause());
    } 
});

Using Web Client in tests

Async async = testContext.async();
WebClient client = WebClient.create(vertx);

client.post(HTTP_PORT, HOSTNAME, "/api/articles/remove")
    .sendJsonObject(new JsonObject().put("id", DOC_ID), req -> {
        if (req.succeeded()) {
            testContext.assertTrue(req.result().bodyAsString().contains("document was deleted"));
            async.complete();
        }
    });

To build

mvn clean install

This repository uses docker-maven-plugin for integration tests so if you don't have Docker daemon you should use -Dmaven.test.skip=true parameter with above command.

To run

sh run.sh