title: How to run Vertx API Async?
body: <p>I try to write Web API with Vertx to serves large users.</p>
  
  <pre><code>@Override
  public Router router(Vertx vertx) {
  Router router = Router.router(vertx);
  router.route().handler(BodyHandler.create());
  router.post("/").handler(this::productionF);
  return router;
  }
  
  private void productionF(RoutingContext routingContext) {
    // check input
    // read data from redis
    // response
  }
  </code></pre>
  
  <p>But now, I want to move this API to Async process to get high performance. I try to use EventBus, but it not work.</p>
  
  <p>Does anyone have any idea or experiment about this? </p>