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Spring Verticle Factory Example

This project shows how you can build a Verticle factory based on the Spring container.

Why not injecting a verticle instance and deploy it directly? Because Vert.x follows the Multi-Reactor pattern, so if you want to scale accross your server’s CPU, you need to deploy multiple instances of your verticle.

Only then Vert.x will guarantee that the instances run on separate event loops.

The code

The io.vertx.examples.spring.verticlefactory.SpringVerticleFactory class is an ApplicationContextAware Spring component. It is given an ApplicationContext on startup and will use it to create verticle instances. As it is managed by the Spring container, it must be registered manually (usually one can do this via the Java service loaders).

The io.vertx.examples.spring.verticlefactory.SpringVerticleFactory depends on a simple greeter component. It sets up an HttpServer and use the greeter to generate a hello message for the HTTP response.

Important
 When you invoke Spring beans from standard verticles, remember that you must not call blocking code or you will block the event loop.

Trying

In a terminal, compile and run the example:

mvn compile exec:java@run

Then in another tab or window, send a few requests to the server.

seq 10 | while read i; do curl http://localhost:8080/?name=Thomas${i}; echo; done

If you look at the console, you’ll notice that the requests have indeed been managed by different event loops:

12:46:02.661 [vert.x-eventloop-thread-2] INFO io.vertx.examples.spring.verticlefactory.GreetingVerticle - Got request for name: Thomas1
12:46:02.685 [vert.x-eventloop-thread-4] INFO io.vertx.examples.spring.verticlefactory.GreetingVerticle - Got request for name: Thomas2
12:46:02.698 [vert.x-eventloop-thread-1] INFO io.vertx.examples.spring.verticlefactory.GreetingVerticle - Got request for name: Thomas3
12:46:02.711 [vert.x-eventloop-thread-3] INFO io.vertx.examples.spring.verticlefactory.GreetingVerticle - Got request for name: Thomas4
12:46:02.722 [vert.x-eventloop-thread-2] INFO io.vertx.examples.spring.verticlefactory.GreetingVerticle - Got request for name: Thomas5
12:46:02.733 [vert.x-eventloop-thread-4] INFO io.vertx.examples.spring.verticlefactory.GreetingVerticle - Got request for name: Thomas6
12:46:02.748 [vert.x-eventloop-thread-1] INFO io.vertx.examples.spring.verticlefactory.GreetingVerticle - Got request for name: Thomas7
12:46:02.761 [vert.x-eventloop-thread-3] INFO io.vertx.examples.spring.verticlefactory.GreetingVerticle - Got request for name: Thomas8
12:46:02.773 [vert.x-eventloop-thread-2] INFO io.vertx.examples.spring.verticlefactory.GreetingVerticle - Got request for name: Thomas9
12:46:02.785 [vert.x-eventloop-thread-4] INFO io.vertx.examples.spring.verticlefactory.GreetingVerticle - Got request for name: Thomas10